Comparative Insecticidal Activity of Three Forms of Silica Nanoparticles on some Main Stored Product Insects

Abstract

The control of stored grain pests requires effective materials that are save for humans and environment, low cost, available and easy to obtain and do not need trained labor. Therefore, the current study suggested testing three silica forms in the form of nanoparticles, these were Aerosil 200, chemical and bio-silica for controlling Callosobrochus maculatus F. (Col., Bruchidae), Rhythopertha dominica fab, and Tribolium confusum (Jacquelin du Val). The obtained results showed that the percent mortality increased with the increasing of concentration and exposure period. Moreover, all the tested materials of nanoparticles had detrimental induction on mortality and offspring of the three tested insects. In addition the adults of C.maculatus were more susceptible followed by R.dominica and T.confusum with the three tested materials at the all concentrations used. Data obtained revealed that the activity of chemical silica had the first rank followed by Aerosil 200 and bio-silica where the LC50 of chemical silica ranged between 0.14-1.54 one day posttreatment with significant distinction compared to Aerosil 200 (0.15-2.65) and bio-silica (2.43-7.35)g/kg grain. The findings obtained showed that the three forms of silica had deterrent action on the all tested immature stages at the all levels of concentrations. Also results clarified the egg stage was the most susceptible compared to larvae and pupae ones. The all treatments reduced the emerged adults and the losses of grain weight. Consequently the present study explained that the three used forms of silica are promising materials for controlling the tested insects as safe alternatives to the synthetic insecticides.

The efficacy of green silica nanoparticles synthesized from rice straw in the management of Callosobruchus maculatus (Col., Bruchidae)

“…A significant increase in mortality was observed at high concentrations, and even at lower concentrations, mortality percentages remained high to some extent. The results showed that the increasing SNPs concentration had increased the mortality of treated C. maculatus after 48 h. This was in line with data published by Salem 23 and El-Bendary and El-Helaly 24 , who observed that mortality rate of insects increased by increasing concentrations and exposure times. The tested formulations of silica nanoparticles achieved significant effect against Tribolium confusum, Rhythopertha dominica , and C .…”

“…The tested formulations of silica nanoparticles achieved significant effect against Tribolium confusum, Rhythopertha dominica , and C . maculatus 23 . In the same context, amorphous SNPs were highly efficient against Sitophilus oryzae and Corcyra cephalonica resulting in over 90% and 100% mortality, respectively, and an increase in exposure time and SNP concentration increased the mortality rate 18 , 25 .…”

Toxicity and Biochemical Effects of Spirotetramat and its Binary Mixtures with Nanosilica against Aphis gossypii Glover, Bemisia tabaci Gennadius and the Earthworm, Eisenia fetida

“…Nanoparticles toxicity has been demonstrated against many insects such as Sitophilus oryzae (Debnath et al, 2011), mosquitoes, including Anopheles stephensi Liston, Aedes aegypti Linnaeus and Culex quinquefasciatus Say (Barik et al, 2012), cotton leafworm, Spodoptera littoralis (El-bendary and El-Helaly, 2013) and the cowpea seed beetle, Callosobruchus maculatus (F.) (Rouhani et al, 2013 andArumugam et al, 2016). The insecticidal activity of nanosilica was also confirmed by Ziaee and Ganji (2016); Diagne et al (2019);Rouhani et al (2019); Haroun et al (2020) and Salem (2020) against Rhythopertha dominica F., Tribolium confusum Jacquelin du Val., Caryedon serratus (Olivier), Tribolium castaneum Herbst., C. maculatus F., and Sitophilus granarius (L.).…”

Nanomaterials for Postharvest Management of Insect Pests: Current State and Future Perspectives

“…All the tested materials caused mortality of adult and offspring of the three tested insects, and mortality increased with the increase of concentration and exposure period. The adults C. maculatus were more susceptible followed by R. dominica and T. confusum with the three tested materials at all concentrations used (Salem, 2020).…”