RNAi Pesticides Promise a Greener Farm Future, but Three Big Barriers Stand in the Way

A quiet revolution is unfolding in the fields of modern agriculture, and it is written in RNA. A comprehensive new review published in Plant Cell Reports synthesizes insights from more than 250 studies to assess how RNA interference, or RNAi, could reshape crop protection in the decades ahead. The analysis, led by Zal Khan Abdullah and Mui Yun Wong of Universiti Putra Malaysia together with colleagues, argues that RNAi has already proven itself in the laboratory and in early commercial products, yet its journey from bench to field remains hampered by three stubborn obstacles: inconsistent silencing efficiency across pest species, the rapid degradation of double-stranded RNA in the environment, and a fragmented regulatory landscape that treats the same molecule very differently depending on where it is sold.

The stakes could hardly be higher. Global agriculture must deliver substantial yield gains by 2050 to feed a growing population while sharply reducing its environmental footprint. Today, pests and pathogens destroy between 20 and 40 percent of annual crop production, losses that are overwhelmingly managed with chemical pesticides carrying well-documented ecological and human health costs, from pollinator decline to contaminated waterways and rising greenhouse gas emissions associated with pesticide manufacture and application. RNA interference offers a fundamentally different approach: a mechanism that can be tuned with near-surgical precision to attack a single pest species while leaving beneficial insects, plants, and mammals untouched.

The underlying biology is elegant. RNAi is a natural gene-silencing pathway found across eukaryotes, first characterized by Andrew Fire and Craig Mello in the nematode Caenorhabditis elegans, work that earned the 2006 Nobel Prize in Physiology or Medicine. When a cell encounters double-stranded RNA, or dsRNA, an enzyme called Dicer slices it into small interfering RNAs. These fragments are loaded into the Argonaute-containing RNA-induced silencing complex, which uses one strand as a guide to find and degrade complementary messenger RNAs. If the dsRNA is designed to match a gene that is essential to a pest’s survival, ingesting it can shut down that gene and kill or debilitate the organism. Because the guide sequence can be chosen to match a target found only in the pest, the specificity of the approach far exceeds that of broad-spectrum chemical insecticides.

Two delivery strategies dominate the field. Host-induced gene silencing, or HIGS, builds the silencing construct directly into the crop’s genome, so the plant itself continuously produces dsRNA aimed at its attackers. Spray-induced gene silencing, or SIGS, instead applies dsRNA externally as a foliar spray, much like a conventional pesticide but with a biological active ingredient. HIGS delivered the first commercial success: the trait MON 87411, targeting western corn rootworm, was introduced in 2022 as part of SmartStax PRO maize, followed by additional RNAi-enabled products such as Bayer’s VT4PRO. SIGS reached the market more recently, when Calantha, developed by GreenLight Biosciences, became in 2023 the first foliar-applied RNA-based biopesticide registered by the United States Environmental Protection Agency, targeting the Colorado potato beetle.

Under controlled laboratory conditions, RNAi can achieve efficacy above 90 percent against susceptible target pests, a figure that rivals or exceeds many conventional insecticides. Yet responsiveness varies dramatically across taxa. Coleopteran insects such as beetles tend to be highly sensitive, while lepidopterans, the moths and butterflies that include some of the world’s most destructive caterpillar pests, often show weak or inconsistent responses. Research has traced this variability to several factors: differences in dsRNA uptake mechanisms, the activity of dsRNA-degrading nucleases in the gut and hemolymph, the efficiency of the core silencing machinery itself, and even the pH and enzymatic environment of the digestive tract. Some insects have also evolved outright resistance, as demonstrated in laboratory-selected populations of western corn rootworm and Colorado potato beetle, a reminder that any pest control technology must be deployed within a resistance management framework.

The second major barrier is environmental persistence. Naked dsRNA is fragile. It degrades rapidly in soil, on leaf surfaces, and in water, attacked by ubiquitous ribonucleases, ultraviolet radiation, and microbial activity. Studies of environmental fate have shown that dsRNA applied to soils typically dissipates within days, which is reassuring from an ecological risk perspective but problematic for growers who need a product to remain active long enough to protect the crop. This instability drives up the dose and frequency of application, and with it the cost, since dsRNA remains considerably more expensive to manufacture than conventional agrochemicals.

Formulation science is racing to close that gap. Nanoparticle carriers, including layered double hydroxide clay nanosheets, chitosan particles, lipid nanoparticles, carbon quantum dots, and engineered nanovesicles, can shield dsRNA from degradation and, in some systems, release it gradually over days or weeks. The BioClay platform, for example, has demonstrated prolonged protection against plant viruses and fungal pathogens by anchoring dsRNA on clay nanosheets that slowly desorb the payload. pH-responsive nanoparticles that release dsRNA in the alkaline midgut of target insects, cell-penetrating peptides that ferry RNA across membranes, and chemically modified dsRNAs that resist nuclease attack are all under active development. Meanwhile, microbial delivery systems are emerging as a complementary route: engineered bacteria and fungi can produce dsRNA in situ, and symbiotic microbes have been used to deliver silencing constructs to mosquito larvae and other targets.

Cost, too, is falling. Traditional dsRNA production relied on in vitro transcription, which is expensive at agricultural scale. Bacterial fermentation using strains optimized for dsRNA accumulation, cell-free production systems, and engineered microbes such as Corynebacterium glutamicum equipped with phage expression machinery have all been shown to yield long dsRNAs suitable for pest control at a fraction of the cost. Computational tools for dsRNA design, including multi-target chimeric designers and off-target prediction software, are simultaneously improving the precision and safety of candidate molecules by screening against the genomes of non-target organisms such as pollinators and natural enemies.

The third barrier is regulatory, and it may be the most consequential. Because RNAi products straddle the boundary between biotechnology and crop protection, jurisdictions classify them inconsistently: as biochemical pesticides, as plant-incorporated protectants, or as novel active substances requiring full GMO-style assessment. The United States has moved fastest, registering both transgenic RNAi traits and sprayable dsRNA products, while the European Union and many other regions are still defining their frameworks. This patchwork creates uncertainty for developers, delays market entry, and risks leaving growers in some regions without access to tools approved elsewhere. Review authors and other commentators have called for global regulatory cohesion, arguing that harmonized, science-based risk assessment frameworks are essential if RNAi biopesticides are to contribute meaningfully to sustainable food production and to the United Nations Sustainable Development Goals.

None of these challenges diminishes the underlying promise. RNAi aligns with the central demands of twenty-first-century agriculture: high specificity, low residues, minimal impact on non-target organisms, and compatibility with integrated pest management. The technology extends beyond pest killing, with demonstrated applications in improving shelf life, enhancing abiotic stress tolerance, modifying oil composition, and managing fungal, viral, and nematode pathogens. What the new review makes clear is that the remaining obstacles are engineering and governance problems rather than fundamental biological ones. If nanoparticle formulations, cheap microbial production, and coherent regulation mature together, RNA interference could indeed become a cornerstone of next-generation agriculture, turning a Nobel-winning discovery into the everyday toolkit of the sustainable farm.

Subject of Research: RNA interference as a sustainable crop protection technology and the barriers to its field deployment

Article Title: RNAi: the next wave of green agriculture, challenges, and bridging the translational gap

Article References: Abdullah, Z. K., Kong, L. L., Ariffin, N., & Wong, M. Y. (2026). RNAi: the next wave of green agriculture, challenges, and bridging the translational gap. Plant Cell Reports, 45(9), Article 271. https://doi.org/10.1007/s00299-026-03939-x

Image Credits: AI Generated

DOI: 10.1007/s00299-026-03939-x

Keywords: RNA interference, RNAi biopesticides, double-stranded RNA, spray-induced gene silencing, host-induced gene silencing, crop protection, sustainable agriculture, nanoparticle delivery, dsRNA stability, pest control, regulation, Plant Cell Reports