| Evaluation of Silicanano particles loaded with Deltamethrin insecticide on the small and large larvae of Trogoderma granarium |
| Paper ID : 1135-3IICE (R1) |
| Authors: |
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Asghar babamir satehi *1, Masumeh ziaee2 1Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran 2Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran. |
| Abstract: |
| The Khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae) is one of the most important pests of stored products. Resistance of pests to synthetic pesticides, adverse effects on non-target and beneficial organisms and their environmental hazards increased the tendency to use low-risk methods for stored products protection. One of the new methods of pests control is the production and application of nanopesticides that utilize to reduces the risks of chemical pesticides, with control release of active ingredient from nanoparticles. Nanopesticides also protect pesticides from degradation due to environmental factors such as light, heat, etc. Moreover, one of the advantages these nanoparticles are being porous of them which cause release of pesticides from them. Therefore, in this study silica nanoparticles (SNPs) were synthesized by sol-gel technique and used as insecticide carrier. Deltamethrin is a pyrethroid insecticide registered in many countries for direct application on grain in storages and silos. In this experiment, the insecticidal efficacy of deltamethrin and silica nanoparticles loaded with deltamethrin (D-SNPs) at 0.5 ppm concentration was evaluated against small and large larvae of T. granarium on wheat grains (Chamran var.). Two control groups containing wheat grains treated with distilled water and treated with non-loaded silica nanoparticles were performed. Glass vials were shaken manually for 5 min to obtain an even distribution of the material on the grain mass. Subsequently, 10 larvae were introduced to each vial covered with muslin cloth to provide sufficient ventilation. The experiments were replicated nine times. The vials were kept in an incubator at 30°C, 65% RH and continuous darkness. The mortality was recorded 1, 2, 5, 7, 10 and 14 days after exposure. Results indicated that in both small and large larvae, the mortality increased with increasing exposure time. Deltamethrin caused 45 and 33% mortality on small and large larvae after 7 days, respectively, and increased to 70 and 61% after 14 days. Generally, the toxicity of nanosilica loaded with deltamethrin was significantly higher compared with that of deltamethrin in all the exposure times. Thereby, 100 and 78% mortality were obtained in small and large larvae 14 days after exposure to nanosilica loaded with deltamethrin. According to the results, small larvae were more susceptible than large larvae to both treatments. It could be concluded that the use of nanoparticles increased the contact exposure of the insects with insecticide and eventually increased mortality. |
| Keywords: |
| Stored product pests, Deltamethrin, Conservation, Nanoparticles |
| Status : Paper Accepted (Poster Presentation) |
