Selectivity Written in Sequence: The First Sprayable RNA Pesticide, and What a Genuinely New Mode of Action Looks Like

1. Introduction: a different kind of selectivity

This journal has examined a dozen modes of action. Every one of them achieves selectivity the same way: a target that exists in insects and differs enough in other animals to give a margin. Sodium channels, acetylcholinesterase, chitin synthesis, juvenile hormone receptors, vitamin K epoxide reductase.

Something else is now registered, and the principle behind it is not physiological at all.

1.1 Why this is in a structural pest journal

Because it is agricultural, unavailable here, and still the most interesting development in insecticide chemistry in decades. Section 20 sets out what it would mean if the approach reached this trade, and §21 is honest about why it has not.

2. What the product is

The basic description.

Calantha, active ingredient ledprona, is a sprayable double-stranded RNA biopesticide specific for L. decemlineata proteasome subunit beta 5 gene that triggers the RNA-interference pathway and is designed to have limited non-target effects.²

The regulator describes the active ingredient as a double-stranded ribonucleic acid molecule with a gene silencing mode of action, applied as a foliar spray in which the beetle will consume and be killed by treated plant material.⁴

2.1 The life stage it has to reach

The pest overwinters as adults buried in soil, emerging in spring, after which females deposit egg masses on lower leaf surfaces, first-instar larvae feed soon after hatching and consume more as they grow, and fully developed fourth-instar larvae stop feeding and pupate in soil.⁸

A product that must be eaten therefore has a window: the feeding larval stages. Adults that have entered diapause in soil, eggs, and pupae are all outside it, which is a constraint the trial results in §6 have to be read against.

2.2 The route of exposure

It has to be eaten. There is no contact activity, no vapour, and no residual barrier in the sense this journal has described for conventional products.

That alone narrows exposure enormously: an insect that does not feed on the treated surface is not exposed, regardless of whether it walks across it.

3. The target gene

What is being switched off, and why it is fatal.

The target codes for proteasome subunit beta 5, which is part of the ubiquitin and proteasome machinery that removes damaged proteins and prevents the accumulation of poly-ubiquitin tagged material.² The gene encodes one of the key catalytic subunits of the proteasome beta molecular machine that catalyses the degradation of proteins tagged by ubiquitin.¹

3.1 Why the proteasome is a good target

Every cell has to dispose of damaged and misfolded proteins continuously. A cell that cannot is not merely impaired; it accumulates material it cannot clear.

Targeting it produces proteasome dysfunction and mortality, with the secondary consequence being accumulation of ubiquitinated proteins.³

3.2 Why an essential gene was chosen deliberately

The target had to be something the insect cannot do without and cannot compensate for. A gene with a redundant backup would be silenced without consequence.

That constraint narrows the candidate list considerably, which is part of why target selection rather than chemistry is the design work in this approach. Related work has explored proteasome genes in other beetles for the same reason.³

3.3 The contrast with conventional targets

Neurotoxins kill quickly by disrupting signalling. This disables a housekeeping function, and the insect dies from the consequences over days rather than minutes.

That difference in speed is worth holding, because §8 compares it to a product that acts faster.

4. The mechanism

The chain from spray to mortality.

RNA interference is described as a naturally occurring gene-silencing mechanism, and RNAi-based sprays as a novel approach in which double-stranded RNA molecules silence essential genes in target pests without acting like toxic conventional compounds.⁵

4.1 The phrase worth examining

Without acting like toxic conventional compounds.⁵ It is still lethal to the target, so it is not non-toxic in any ordinary sense.

What is meant is that the lethality does not arise from chemical interaction with a receptor. It arises from the cell's own machinery following an instruction, which is why the selectivity question has a different shape.

5. The evidence the pathway is engaged

How the researchers established that RNA interference was actually what happened.

The length distribution of small RNA sequences originating from exposed larvae showed 21 base pair small interfering RNA Dicer products, with specific sequence identity.¹

5.1 What Dicer is doing

RNA interference is the cell's own system, present because it evolved partly as a defence against viruses with double-stranded RNA genomes. Dicer cuts long double strands into short fragments, and those fragments are then used to find and destroy matching messages.

The product does not introduce a mechanism. It supplies a substrate to one the insect already runs, which is the sense in which §4 calls it a naturally occurring mechanism.⁵

5.2 Why that matters

Dicer is the enzyme that cuts long double-stranded RNA into short fragments. Finding fragments of the expected length, matching the applied sequence, is direct evidence that the insect's own machinery processed the material as the mechanism predicts.

It rules out the alternative that mortality came from some incidental property of applying nucleic acid to an insect.

6. What the laboratory found

The dose and timing results.

Assays with second instar larvae showed a dose response where 25 by ten to the minus six grams per litre caused 90 per cent mortality after 6 days of initial exposure. Exposure for 6 hours caused larval mortality and decreased target messenger RNA expression, and a decrease in protein levels was observed after 48 hours of larval exposure.¹

6.1 What a dose response establishes

That mortality scales with concentration rather than occurring at some arbitrary threshold, which is what you would expect if the mechanism is quantity of material taken up and processed.

It also gives a basis for setting a rate, which this journal's article on the label noted is a binding condition rather than a suggestion.

6.2 The six hour figure

A short exposure window was sufficient. The insect does not need continuous access to treated foliage; it needs a feeding bout.

7. The irreversibility

The finding that distinguishes this from a sub-lethal dose of a conventional product.

Both messenger RNA and protein levels did not recover over time.¹

7.1 What non-recovery rules out

Two things. That the insect clears the material and resumes normal expression, and that the silencing is transient in the way a drug wearing off would be.

Neither happened over the observation period, which is consistent with the silencing being self-sustaining once established rather than requiring continued presence of the applied molecule.¹

7.2 Why this is significant

This journal has repeatedly documented sub-lethal exposure as the route to resistance: an insect survives a dose, recovers, and its descendants are selected for tolerance.

An insect that has taken up enough of this material to silence the gene does not appear to recover from it. Whether that translates into a lower resistance risk is a separate question that §19 says is unanswered, but the recovery mechanism available after a sub-lethal neurotoxic dose does not appear to be available here.

8. Against a conventional standard

The efficacy comparison, which is the question a grower asks.

Efficacy was demonstrated in a whole plant greenhouse trial and performed similarly to spinosad.¹

8.1 Why that comparator was well chosen

Spinosad is an established and effective product with its own mode of action, not a weak benchmark. Performing similarly to it is a meaningful claim rather than a favourable comparison.

8.2 What comparable means given §3.2

Similar control at the end of the trial, achieved more slowly. A product that kills over days leaves feeding damage that a faster one does not, which is a real agronomic cost even where final control matches.

That qualification is ours; the source reports the comparison without decomposing it.

9. The non-target trials

The test of the central claim, and the reason this article exists.

Researchers conducted two years of field trials in Idaho, Wisconsin, and Maine comparing arthropod responses to different insecticide regimes, with and without the product. Comparisons of arthropod abundance among treatments showed no evidence of effects on non-target arthropods, including beneficials, being predators and parasitoids, neutrals, being non-pests, and other beetle species. Conventional insecticides generally showed more non-target effects.²

9.1 Why this is the test that matters

A specificity claim can be made in a laboratory by exposing a handful of species and observing nothing. That establishes very little, because the species are chosen and the conditions are artificial.

A field trial samples whatever is present, including species nobody selected, at the abundances they naturally occur, in the setting the product will be used. It is the harder test and the one this journal has repeatedly found missing for other technologies.

9.2 The design

Two years, three states, with and without the product, against conventional regimes. That is a comparison rather than a demonstration, and the conventional arm is what gives the negative result meaning.

A trial finding no effects without a positive control would be consistent with the method being unable to detect effects at all. Here the conventional treatments did show effects, which establishes that the measurement worked.

10. What that result means

Stated carefully, because no evidence of effects is not the same as no effects.

Across the taxa sampled, at the abundances present, using those methods, over two seasons, the product was not distinguishable from not applying it.

10.1 Why this is nonetheless a large claim

This journal has documented non-target harm from several conventional chemistries: pollinator exposure from perimeter barrier treatment, predatory birds accumulating rodenticide residues, and the general reduction of beneficial arthropods that follows broad-spectrum application.

A product that controls its target and leaves predators and parasitoids intact is the objective that integrated pest management has pursued for decades, and this is the closest thing to it that this journal has encountered.

10.2 The parasitoid result specifically

Parasitoids are the group most vulnerable to conventional treatment, because they are small, they forage on treated foliage, and their populations recover slowly.

They are also the group whose loss most reliably produces a secondary pest outbreak, since removing a specialist natural enemy releases whatever it was suppressing. A product that leaves them intact preserves the control that was already happening for free.

10.3 The category it did not affect that surprised us

Other beetle species.² Selectivity within an order, and within the same order as the target, is a much stronger result than selectivity against unrelated groups.

A conventional insecticide that kills a leaf beetle kills most beetles, because they share the target site. Sequence-based selectivity has no such constraint.

11. The sampling detail worth noting

A methodological point that the previous article in this journal makes relevant.

Responses were always stronger for arthropods from vacuum samples than pitfall samples.²

11.1 Why the method changed the answer

Vacuum sampling takes arthropods off foliage, which is where a foliar spray lands. Pitfall traps catch what walks across the ground.

The same treatment produces a stronger signal in the sample that is closer to the exposure, which is exactly what this journal's detection article described: what you measure depends on where the instrument is.

12. Why selectivity works this way

The conceptual point, which is the heart of the article.

Conventional selectivity is a ratio. A compound binds an insect target more tightly than a mammalian one, and the margin between an effective dose and a harmful one is what makes it usable. The margin is always finite.

12.1 Why the margin is always finite

Because the target exists in the non-target too. Acetylcholinesterase is acetylcholinesterase; the insect version differs enough to exploit, and the exploitation is a matter of degree.

Every article in this journal about non-target harm reduces to that. The pollinator, the raptor and the applicator all have the machinery the compound was designed to disrupt, and only the dose separates them from the target.

12.2 What sequence complementarity does instead

A fragment either matches a message or it does not. An organism without that sequence has nothing for the fragment to bind, so the question is not how much it receives.

That is a categorical rather than a quantitative basis for selectivity, which is why the non-target result in §9 is achievable at all.

12.3 Where the quantitative part returns

Sequences are not unique. Related species share related genes, and the degree of similarity determines whether a fragment matches well enough to act.

So the categorical picture is an idealisation, and §13 gives what the sources actually say.

13. The limit on specificity

The qualification that belongs in every honest account of this.

The product shows high specificity toward the Colorado potato beetle and appears to act exclusively against this species and closely related beetles.⁵

13.1 Reading that sentence properly

Exclusively against this species and closely related beetles. The second clause is doing real work, and a reader who stops at the first has a different impression.

Closely related beetles are the organisms most likely to share the target sequence, which is precisely what §12.2 predicts. The specificity is real and it is bounded by phylogeny.

13.2 The manufacturer's claim

The company claims it specifically targets the Colorado potato beetle and is not harmful to other insects, and that the product breaks down rapidly in the environment.⁶

That is a commercial statement, and the field evidence in §9 supports it for the taxa sampled. The peer-reviewed formulation at the head of this section is narrower, and we would use that one.

The rapid breakdown claim is separately plausible on mechanism, since RNA is not a persistent molecule, but we located no independent environmental fate data and are not endorsing it.

14. What was in the container

A detail that surprised us.

The active ingredient is 0.8 per cent of the formulation by weight, with the rest over 75 per cent water and around 21 per cent other co-formulants. The liquid product is diluted and then applied as a foliar spray.⁷

14.1 The number in context

Under one per cent active ingredient is low even by the standards of a dilute formulation, and the product is then diluted further before spraying.⁷

That is a consequence of potency measured in the laboratory at concentrations of tens of millionths of a gram per litre.¹ Very little material is needed, which is also why §15's manufacturing problem was solvable at all.

14.2 Why the co-formulant fraction matters

Twenty-one per cent of the product is something other than the active or water, and this journal's formulation article argued that co-formulants determine how a product behaves on a surface and are not inert in any meaningful sense.

A highly specific active does not by itself make a highly specific product. The environmental and non-target profile of the whole formulation is what matters, and §9 tested the formulation rather than the molecule, which is the right test.

15. Why this took so long

The barrier, which was not scientific.

Previous studies had proven the susceptibility of the beetle to RNA interference and demonstrated the potential of this technology, but one of the key known limitations of this approach was the capacity to scale double-stranded RNA production at a low cost.¹

The registered product came from a proprietary cell-free RNA production platform that overcomes the historic challenges of cost and rapid scale-up performance found with conventional RNA synthesis.¹

15.1 The lesson in that

The biology was established years before the product. What changed was manufacturing economics.

This journal has generally found the constraint on better pest control to be evidence or incentives. Here it was the cost of making a kilogram of the active ingredient, which is a reminder that some good ideas wait on process engineering rather than on discovery.

16. The regulatory position

How the approval was framed.

The regulator evaluated the active ingredient and the formulation and concluded that it meets the regulatory and safety standards under the governing pesticide statute, the food safety statute, and the endangered species statute.⁴

It is the first double-stranded RNA pesticide in the world allowed to be sprayed on plants, and the approval was reported as being for 3 years.⁶

16.1 The three statutes named

Pesticide registration, food safety, and endangered species.⁴ The third is worth noticing on a product whose selling point is specificity, because endangered species assessment is precisely where non-target effects become a legal obstacle rather than an externality.

This journal's pollinator and rodenticide articles both described non-target harm as something the regulatory system addresses through buffer zones and label warnings after the fact. A product designed to have no mechanism in non-targets engages that assessment differently.

16.2 The time limit

A defined term rather than an open registration is the regulator reserving the ability to reconsider, which is a reasonable posture toward a first-in-class product.

This journal's article on the label as a legal instrument described registration as a set of conditions rather than a permanent permission. A time-limited approval is that principle made explicit.

17. The earlier precedent

What was not new about this.

In 2015, the regulator registered the first double strand RNA-based insecticidal product, which was a plant incorporated protectant in corn for control of western corn rootworm.⁷

17.1 Why nine years passed between them

A plant-incorporated protectant makes the dsRNA in the plant's own cells, continuously, at whatever quantity the plant produces. A sprayable product has to be manufactured in tonnes and applied.

That is the manufacturing problem in §15 stated as a comparison: the first route sidestepped it by letting the crop do the synthesis, and the second required solving it.

17.2 The distinction

That earlier product was expressed by the plant itself, which makes it a genetically modified crop question. This one is sprayed onto a conventional plant.

The approach is described as a promising platform for developing innovative, non-genetically modified plant protection products,⁵ and that distinction is much of why it matters commercially and politically.

18. Why the pest needed it

The situation that motivated the work, which is the situation this journal has described repeatedly in other species.

The target is described as having a propensity to develop resistance to virtually every known class of chemical insecticide.¹ Because of the repeated use of single insecticide classes without rotating active ingredients, many chemicals are no longer effective against it.¹ Populations can rapidly evolve resistance to multiple classes.³

18.1 The cost that justified the programme

Management costs reaching tens of millions annually, and billions if unmanaged.¹ Those figures are what funded a decade of work on a single species.

18.2 The familiar shape

A fast-breeding insect, intensive single-class use, resistance, escalation, and eventually nothing left that works. This journal has documented the same sequence in bed bugs, cockroaches, stored product beetles, head lice and rodents.

Here the response was not a more potent version of an existing class, which is what every previous article found. It was a different mechanism entirely, and that is the part worth noticing.

19. The resistance question

The obvious thing to ask, and the thing nobody can yet answer.

The product is positioned as fitting into integrated pest management and insecticide resistance management programs,¹ which is the standard claim for any new mode of action.

19.1 Why the answer is unknown

There is no field population with a history of exposure to this. Resistance to a mode of action is discovered after deployment, and this journal's articles on every other class describe that discovery happening years in.

19.2 The routes we would expect to be explored

Reduced uptake of the molecule, faster degradation of it before processing, changes in the processing machinery itself, or mutation in the target sequence that breaks complementarity without breaking the protein.

The last of those is the one with no analogue in conventional resistance, and it is a theoretical possibility rather than an observed one. We flag the whole of §19.2 as our reasoning.

19.3 The argument that it should be more durable

Worth putting properly. Resistance to a neurotoxin often arises from a point mutation in a receptor that reduces binding while preserving function. The receptor still works; it just binds the compound less well.

A sequence match has a different structure. Changing the target messenger RNA enough to break complementarity means changing the gene, and the gene codes for an essential proteasome subunit, so there may be less room to alter it without cost. That is an argument, not a finding, and we would not rely on it.

19.4 The uncomfortable structural point

Being the only active ingredient in its group⁷ means there is nothing to rotate it with. A resistance management programme built around a single-member class has the same problem this journal described for phosphine in stored grain.

20. What this would mean for structural work

The speculative section, labelled as such.

Nothing in this exists for any structural pest. What follows is what it would change if it did.

20.1 The non-target problem largely dissolves

This journal's pollinator article found barrier sprays reaching flowering plants, and its rodenticide articles found residues in predators. Both arise because the active ingredient acts on conserved physiology shared with non-targets.

A sequence-specific active applied around a building would have no mechanism of action in a bee, a bird or a pet, because they do not carry the sequence.

20.2 The occupant exposure question changes shape

The applicator exposure article in this journal measured pesticide reaching the operator by inadvertent oral and dermal routes. Those routes would still occur; what would differ is what happens afterwards.

We would not state that as safe, because we have no toxicological basis for it and §22 records that. We state only that the mechanism of insecticidal action is absent in a mammal.

20.3 The species identification problem would get worse

A sequence-specific product only works if you know which species you have. This journal has documented misidentification in spiders, small flies, ants and wood damage, and a broad-spectrum product forgives that error while a sequence-specific one does not.

So the technology that removes the non-target problem creates a diagnostic requirement, and the detection articles in this journal suggest the trade is not well placed to meet it. That is our observation rather than a sourced one.

20.4 What would not change

It has to be eaten,⁴ so it would be a bait technology rather than a residual one. Everything this journal has written about bait acceptance, neophobia, aversion and placement would apply unchanged, and the horizontal transfer article's mechanism would be the obvious delivery route for a social insect.

21. Why it is not here yet

The honest answer.

Development targets a crop pest worth tens of millions of dollars annually in management costs, rising to billions if unmanaged.¹ That market funds a sequencing programme, a manufacturing platform and a registration.

21.1 The economics of a structural equivalent

A product for German cockroaches or bed bugs would need its own target gene, its own sequence, its own manufacturing and its own registration, against a smaller and more fragmented market.

The credence goods article in this journal argued that this trade under-invests in things whose value the customer cannot assess. A novel active ingredient is an extreme case of that, which is our explanation rather than a sourced one.

21.2 The one structural pest that might justify it

If any did, it would be the German cockroach. It has documented resistance to multiple classes, a documented behavioural resistance to bait matrices, a large and recurring market, and this journal has described it as the organism where the available tools are eroding fastest.

It is also a species where the horizontal transfer route in §20.4 works, which would suit a material that has to be eaten. We are speculating.

21.3 What would change it

The manufacturing platform in §15 is not pest-specific. If the cost of producing an arbitrary sequence at scale is now low, the marginal cost of a second target is design and registration rather than chemistry.

That is the reason to expect more of these rather than one, and it is a prediction rather than a report.

22. Limitations and open questions

One product, one pest, one crop. Everything here concerns a single registered product against a single beetle on a single crop, and no general conclusion about the platform follows from it.

The non-target trials sampled arthropods. Two years, three states, vacuum and pitfall sampling.² They do not address vertebrates, soil organisms, aquatic systems or human health, which were assessed separately by the regulator through a process we have not read.⁴

No evidence of effects is a statement about statistical power. The previous article in this journal set out why a negative result depends on the effort behind it, and we have not assessed that here beyond noting that the conventional arm did show effects.

We have read abstracts and summaries. The registration decision document, in particular, is cited for its conclusion rather than for its reasoning, which is where the substance is.⁴

Resistance is entirely unknown. Stated in §19.1, and §19.2 is speculation.

Section 20 is speculative throughout. No structural product exists, and the claims about what one would do are inferences from the mechanism rather than findings.

Sections 8.2, 12, 13.1, 14.1, 19.2, 20 and 21.1 are our reasoning. The speed qualification, the categorical selectivity framing, the reading of the specificity clause, the co-formulant point, the resistance routes, the structural speculation and the economic explanation are ours rather than sourced positions.

Our commercial position. We sell nothing related to this and cannot obtain it. The article is enthusiastic about a technology we have no access to, which is a different bias from the usual one but still a bias.

23. Conclusion

A 490 base pair double-stranded RNA with exact complementarity to one gene in one beetle, sprayed on foliage, eaten, cut by the insect's own Dicer into 21 base pair fragments that silence the message, after which the proteasome fails and the animal dies.¹³ Six hours of exposure was enough, protein levels fell by 48 hours, neither messenger RNA nor protein recovered, and greenhouse performance was similar to a conventional product.¹

Two years of field trials in three states found no evidence of effects on predators, parasitoids, non-pest species or other beetles, while conventional insecticides generally showed more.² Selectivity within the same order as the target is the part that conventional chemistry cannot do, because it works on a ratio and this works on a match. The qualification is real and belongs beside the claim: the specificity is described as extending to closely related beetles.⁵

None of it is available for anything this trade treats, and the reason is a market rather than a mechanism. What makes it worth an article anyway is that every previous response to resistance documented in this journal has been a more potent version of something that already existed, with the ecological bill arriving later. This one was a different answer to the question, and the bill has not turned up yet. It may. But the shape of it is new enough to watch.

References

1. First Sprayable Double-Stranded RNA-Based Biopesticide Product Targets Proteasome Subunit Beta Type-5 in Colorado Potato Beetle (Leptinotarsa decemlineata). Frontiers in Plant Science, 12, 728652. Principal source. Used for the statements that the pest feeds on leaves and can completely defoliate crops, that because of repeated use of single insecticide classes without rotating active ingredients many chemicals are no longer effective, and that the species has a propensity to develop resistance to virtually every known class of chemical insecticide; for the description of the active ingredient as a sprayable double-stranded RNA biopesticide with a new mode of action that triggers the RNA interference pathway, being a 490 base pair double-stranded RNA with identical sequence complementarity to the target messenger RNA, the target encoding one of the key catalytic subunits of the proteasome beta molecular machine that catalyses degradation of proteins tagged by ubiquitin; for the laboratory results that assays with second instar larvae showed a dose response in which 25 by ten to the minus six grams per litre caused 90 per cent mortality after six days of initial exposure, that exposure for six hours caused larval mortality and decreased target messenger RNA expression, that a decrease in protein levels was observed after 48 hours, and that both messenger RNA and protein levels did not recover over time; for the observation of 21 base pair small interfering RNA Dicer products with specific sequence identity; for the demonstration of efficacy in a whole plant greenhouse trial performing similarly to spinosad; for the statement that a key known limitation had been the capacity to scale double-stranded RNA production at low cost and that the product came from a proprietary cell-free RNA production platform overcoming historic challenges of cost and rapid scale-up; for the positioning of the product within integrated pest management and insecticide resistance management programmes; and for the figures that management costs reach tens of millions of dollars annually, rising to billions if unmanaged. https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2021.728652/full
2. Responses of Non-Target Arthropods to the dsRNA Bioinsecticide Calantha and Conventional Insecticides Targeting Colorado Potato Beetle. American Journal of Potato Research. doi:10.1007/s12230-025-09979-5. Principal non-target source. Used for the statement that management of the pest is reliant on conventional insecticides that can negatively affect non-target arthropods; for the description of the product as a sprayable double-stranded RNA biopesticide specific for the target species proteasome subunit beta 5 gene that triggers the RNA-interference pathway and is designed to have limited non-target effects; for the study design of two years of field trials in Idaho, Wisconsin and Maine comparing arthropod responses to different insecticide regimes with and without the product; for the results that comparisons of arthropod abundance among treatments showed no evidence of effects on non-target arthropods including beneficials such as predators and parasitoids, neutrals meaning non-pests, and other beetle species, that conventional insecticides generally showed more non-target effects, and that responses were always stronger for arthropods from vacuum samples than pitfall samples; and for the note that the product recently received federal registration and is the first featuring a sprayable double-stranded RNA triggering the pathway in this species. https://link.springer.com/article/10.1007/s12230-025-09979-5
3. Targeting the proteasome subunit PSMB5 by RNA interference induces proteasome dysfunction and mortality in the Colorado potato beetle. PubMed Central PMC12639069. Used for the statements that the species is a devastating pest of potato crops in the northern hemisphere, that chemical control methods are expensive, harmful to non-target species and inefficient because populations can rapidly evolve resistance to multiple classes of insecticides, and that double-stranded RNA provides an opportunity for sustainable and targeted control by RNA interference; for the statement that the active ingredient achieves efficient suppression of target gene expression and protein synthesis, causing mortality and protecting crop plants in laboratory and field; for the description of the active as a 490 base pair sprayable double-stranded RNA targeting an essential subunit of the proteasome core particle, assigned to insecticide resistance action committee group 35; for the statement that its registration is a significant milestone as the first sprayable double-stranded RNA pesticide; and for the reference to related work on proteasome gene targets in another beetle in which secondary effects of accumulating ubiquitinated proteins were not investigated. https://pmc.ncbi.nlm.nih.gov/articles/PMC12639069/
4. Registration Decision for the New Active Ingredient Ledprona. United States Environmental Protection Agency. Regulatory decision document, cited for its stated conclusions rather than its underlying analysis. Used for the description of the evaluated products and the conclusion that they meet the regulatory and safety standards under the federal pesticide statute, the federal food and drug statute, and the endangered species statute; for the statement that the active ingredient is intended to control the Colorado potato beetle on potatoes; and for the description of products being used as foliar or sprayable applications in which the beetle will consume and be killed by treated plant material, the active ingredient being a double-stranded ribonucleic acid molecule with a gene silencing mode of action. https://downloads.regulations.gov/EPA-HQ-OPP-2021-0271-0196/content.pdf
5. Koch and colleagues. The first RNAi-based biopesticide approved in the United States: regulatory implications for the European Union, the case of Ledprona (Calantha). Pest Management Science. doi:10.1002/ps.71219. Used for the statements that RNA interference is a naturally occurring gene-silencing mechanism which has emerged as a promising platform for developing innovative, non-genetically modified plant protection products; that in the context of climate change, biodiversity loss and growing resistance to traditional pesticides the need for highly specific, environmentally compatible alternatives is increasing; that RNAi-based sprays are a novel approach in which double-stranded RNA molecules silence essential genes in target pests without acting like toxic conventional compounds; and for the assessment that the product shows high specificity toward the Colorado potato beetle and appears to act exclusively against this species and closely related beetles. https://scijournals.onlinelibrary.wiley.com/doi/10.1002/ps.71219
6. EPA allows novel RNAi pesticide for 3 years. Chemical and Engineering News, 102(1). Trade science news reporting. Used for the report that the agency approved use of a sprayable biopesticide relying on RNA interference; that the product is the first double-stranded RNA pesticide in the world allowed to be sprayed on plants according to the agency; that the active ingredient works by turning off a gene the beetle needs to produce a protein critical for its survival; for the approval being reported as running for three years; and for the manufacturer's claims that the product specifically targets the Colorado potato beetle, is not harmful to other insects, and breaks down rapidly in the environment. https://cen.acs.org/environment/pesticides/EPA-allows-novel-RNAi-pesticide/102/i1
7. Minutes of a state pesticide board meeting considering the new active ingredient. Administrative record. Used for the statement that the active ingredient is 0.8 per cent of the formulation by weight with the rest over 75 per cent water and around 21 per cent other co-formulants, and that the liquid product is diluted and applied as a foliar spray; for the identification of the mode of action as insecticide resistance action committee group 35, RNA interference-mediated target suppressor, and that it is the only active ingredient in this group to date; and for the note that in 2015 the federal regulator registered the first double-stranded RNA-based insecticidal product, a plant incorporated protectant in corn for control of western corn rootworm. https://www.mass.gov/doc/minutes-for-september-19-2024/download
8. First Sprayable Double-Stranded RNA-Based Biopesticide Product Targets Proteasome Subunit Beta Type-5 in Colorado Potato Beetle. PubMed Central PMC8650841. Repository version of the primary study, consulted for the description of the pest life cycle including emergence of overwintered adults from soil in spring, egg deposition on lower leaf surfaces, larval feeding increasing with growth, pupation in soil, and the dependence of subsequent adult behaviour on temperature, photoperiod and crop condition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8650841/