The appeal of entomopathogenic nematodes, or EPNs, is easy to understand. Species in the genera Steinernema and Heterorhabditis are found on every continent except Antarctica, and they infect a remarkably broad range of insect hosts. Once infective juvenile nematodes locate a suitable host, they enter through natural openings such as the mouth, anus, or spiracles, and release their bacterial symbionts, Xenorhabdus in Steinernema and Photorhabdus in Heterorhabditis. These bacteria multiply rapidly inside the insect’s hemocoel, killing the host within a matter of days through septicemia, while simultaneously creating conditions that allow the nematodes to reproduce. Under recommended application conditions, EPNs generally show low adverse effects on non-target organisms, making them compatible with the ecological principles that underpin integrated pest management programs.

Yet for all their promise, EPNs have struggled to become mainstream tools in large-scale agriculture, and the reasons are largely environmental. The infective juvenile stage, which is the form applied in the field, is exquisitely sensitive to the conditions it encounters after leaving the production facility. Ultraviolet radiation from sunlight can kill nematodes within minutes of exposure. Desiccation is equally lethal, since these organisms require a film of moisture to move, breathe, and infect. Temperature extremes, both hot and cold, degrade their survival and infectivity, and once applied to soil, nematode persistence can decline rapidly, leaving pests unprotected before the crop cycle ends. Storage and delivery add further complications, as live biological products demand cold chains and careful handling that conventional chemical pesticides do not. These constraints translate into higher application frequencies, inconsistent field performance, and a cost structure that often loses out to synthetic insecticides.

This is precisely where nanotechnology enters the picture. The Indian review team surveys a growing toolbox of nano-based formulations, including nanoemulsions, nanocarriers, and nano-based coatings, that can be used to protect EPNs and enhance their insecticidal potential. The core idea is elegantly simple: wrap the living biological agent, or the active compounds associated with it, in engineered materials so small that they interact with the environment in fundamentally different ways than bulk formulations. Nanoscale carriers can shield nematodes from harsh ultraviolet light, buffer them against temperature swings, and slow the loss of moisture that would otherwise prove fatal. In doing so, they extend the window of activity that determines whether a nematode application succeeds or fails in the field.

The technical mechanisms behind this protection draw on well-established principles of materials science. Nanoemulsions, for example, are kinetically stable mixtures of oil and water stabilized by surfactants, with droplet sizes typically in the tens to hundreds of nanometers. At this scale, the interfacial area between phases becomes enormous, allowing active ingredients to be dispersed uniformly and delivered efficiently. Nanocarriers, including polymeric nanoparticles and other encapsulation systems, can be engineered to release their payloads in a controlled and targeted manner, responding to environmental triggers such as moisture, pH, or temperature. Nano-based coatings applied directly to nematodes or to the substrate carrying them can create a protective microenvironment around the infective juveniles, reducing desiccation stress during application and in the hours that follow. The review emphasizes that such systems permit controlled, targeted, and target-specific release, which means the biological agent is delivered where and when it is needed rather than being wasted on the surrounding environment.

The practical consequences of this integration could be significant. According to the review, nano-enhanced EPN formulations have the potential to improve nematode survival, stability, and infectivity simultaneously, leading to improved pest management efficiency even at reduced application frequencies. For farmers, fewer applications mean lower labor costs, less machinery time, and reduced disruption to soil ecosystems. For the environment, it means smaller quantities of biological material and carrier substances released per unit of crop protected. The authors frame this within the broader transition from chemical to green pest management, noting that the integrated approach aligns with the principles of eco-friendly and sustainable agriculture by reducing dependency on chemical insecticides and supporting integrated pest management programs. In an era when pesticide residues, resistance development in pests such as Spodoptera species, and health risks to farmworkers are drawing increasing scrutiny, the timing of such innovations is hardly accidental.

The review does not stand in isolation. It builds on a substantial body of recent research documenting both the promise and the pitfalls of nanopesticides more broadly. Studies of nanoencapsulated botanical insecticides, such as neem oil nanoemulsions, have demonstrated that nanoscale delivery can dramatically improve the performance of naturally derived active ingredients. Work on polymeric nanocarriers for pesticides like abamectin has shown that surface functionalization can enhance foliar retention and adhesion, keeping the active compound on the plant where it is needed. Chitin nanocrystal Pickering emulsions have been developed for pesticide microencapsulation with superior leaf adhesion and enhanced safety profiles. Even RNA interference technology, one of the most talked-about frontiers in crop protection, depends on nanocarriers and polymer systems to deliver double-stranded RNA into insect cells. The lesson across all of these platforms is consistent: nanotechnology excels at protecting fragile active ingredients from degradation and delivering them precisely to their targets, and EPNs are arguably the most fragile and most precisely targeted biological agents in the entire biocontrol arsenal.

However, the review is careful not to paint an uncritically rosy picture, and the challenges it identifies are substantial. Environmental safety remains a primary concern, since engineered nanomaterials introduced into soil ecosystems may interact with microorganisms, earthworms, and other non-target organisms in ways that are not yet fully understood. Research on silver nanoparticles and carbon nanotubes in aquatic systems has documented toxicity to fish and other organisms, underscoring that nanoscale does not automatically mean benign. Production costs present another hurdle, as nanoformulations must compete economically with cheap, mass-produced chemical insecticides if they are to achieve widespread adoption, particularly in the developing world where the majority of food production occurs. Regulatory approvals add a further layer of complexity, since many jurisdictions lack clear frameworks for evaluating products that combine living biological agents with engineered nanomaterials. The authors stress that these challenges must be handled carefully, and that constant research and field validation are essential before the combined potential of EPNs and nanotechnology can be realized in practice.

What emerges from the review is a vision of pest management that looks radically different from the spray-and-hope model of the twentieth century. In this vision, a farmer applies a formulation containing nematodes armored against UV radiation and desiccation by nanoscale coatings, carried in a delivery system that releases them gradually into the root zone where soil-borne pests feed. The nematodes survive longer, disperse more effectively, and kill more insects per application, while the surrounding soil community remains largely undisturbed. The symbiotic bacteria within the nematodes do the lethal work that chemical insecticides once did, but without the residues, the resistance treadmill, or the documented health risks to farmworkers and their families that have been associated with prolonged pesticide exposure. It is a system that borrows the precision of modern drug delivery and applies it to the oldest form of pest control imaginable: one organism killing another.

Whether that vision becomes reality will depend on the hard, unglamorous work of field trials, cost engineering, and regulatory negotiation that lies ahead. The review by Guleria and colleagues makes clear that the scientific foundations are in place, with decades of research on EPN biology, formulation science, and nanomaterial engineering converging at a moment when agriculture desperately needs alternatives to chemical insecticides. The next-generation formulations the authors describe, from nanoemulsions to smart coatings, are no longer laboratory curiosities but emerging products at the frontier of a nanobiopesticide industry that is expanding rapidly. If the remaining challenges of environmental safety testing, production scaling, and regulatory harmonization can be resolved, the marriage of microscopic worms and engineered nanoparticles may prove to be one of the most consequential developments in sustainable agriculture of the coming decade, turning what was once a niche biological control tool into a cornerstone of global food security.

Subject of Research: Integration of nanotechnology with entomopathogenic nematodes for sustainable insect pest management

Article Title: Integrating entomopathogenic nematodes and nanotechnology for next-generation insect pest management

Article References: Guleria, A., Thakur, H., Kumari, S., & Thakur, N. (2026). Integrating entomopathogenic nematodes and nanotechnology for next-generation insect pest management. Journal of Nanoparticle Research, 28(9), Article 234. https://doi.org/10.1007/s11051-026-06760-5

Image Credits: AI Generated

DOI: 10.1007/s11051-026-06760-5

Keywords: entomopathogenic nematodes, nanotechnology, biopesticides, integrated pest management, nanoemulsions, nanocarriers, sustainable agriculture, soil-borne pests, biological control, Steinernema, Heterorhabditis, precision agriculture