Preparation of an Environmentally Friendly Nano-Insecticide through Encapsulation in Polymeric Liposomes and Its Insecticidal Activities against the Fall Armyworm, Spodoptera frugiperda

Abstract

The insecticide emamectin benzoate (EB) was formulated with nanoparticles composed of DSPE-PEG2000-NH2 by the co-solvent method to determine its adverse impacts on the environment and to reinforce its dispersion, adhesion, and biocompatibility. A good encapsulation efficiency (70.5 ± 1.5%) of EB loaded in DSPE-PEG2000-NH2 polymeric liposomes was confirmed. Dynamic light scattering (DLS), transmission electron microscopy (TEM), and contact angle meter measurements revealed that the DSPE-EB nanoparticles had a regular distribution, spherical shape, and good leaf wettability. The contact angle on corn leaves was 47.26°, and the maximum retention was higher than that of the reference product. DSPE-EB nanoparticles had strong adhesion on maize foliage and a good, sustained release property. The efficacy trial showed that the DSPE-EB nanoparticles had a strong control effect on S. frugiperda larvae, with the LC50 of 0.046 mg/L against the third-instar S. furgiperda larve after 48 h treatment. All these results indicate that DSPE-EB nanoparticles can serve as an insecticide carrier with lower environmental impact, sustained release property, and effective control of pests.

Efficacy of the Coragen Insecticide and Coragen Nanocapsules in Controlling the Corn Stem Borer Sesamia cretica (Lepidoptera: Noctuidae) on Zea mays

“…On the other hand, SEM does not rely on laser beams; rather, it utilizes electromagnetic radiation. Hence, there is a difference in the nature of their operations, reflecting in the measurement characteristics [18]. The diameter rates in the results are attributed to the nature of the composition of the nano capsules.…”

“…The results confirm and indicate the nano nature, which is measured based on laser beam scattering by the device towards particles suspended in the liquid medium of these capsules. Larger scattering implies smaller and acceptable sizes, and they tend to resist agglomeration and clustering[18].…”

Current and future prospects of “all-organic” nanoinsecticides for agricultural insect pest management

“…Using the co-solvent approach, nanoliposomes were synthesized by encapsulating emamectin benzoate with 1,2-distearoyl-sn-glycero-3phosphoethanolamine-N-[amino(polyethylene glycol)-2000]. The resulting nanoformulation not only has considerable larvicidal activity against the fall armyworm, Spodoptera frugiperda (LC50: 0.046 mg/L) but also has improved leaf adherence and outstanding sustained release properties (Chen et al, 2022). Sharma et al (2021b) have developed nanoformulations using copper and selenium modified graphene oxide nanocomposite containing captan.…”

Synthesis and Evaluation Nanoinsecticidal Activity of Silicadioxide Nanoparticles Combined with Euphorbia peplus and Euphorbia helioscopia Extracts to Control Tribolium confusum

“…Investing and properly exploiting plants is one of the easiest ways to protect the environment. The concept of "green projects" is the first step taken by many to develop modern methods in the manufacture of green bio-insecticides and in the control of insect pests to reduce the indiscriminate use of chemical insecticides and search for other alternatives that are less dangerous to human health and environmental friendly (El-Helaly et al, 2016;Chen et al, 2022). These alternatives should eliminate insects and pests that kill agricultural crops and stored materials in a selective manner that does not harm the nontarget beneficial living organisms that exist side by side with harmful ones (Samia et al, 2020).…”