Bioassays were conducted to assess the effects of two silicon dioxide nanoparticles of Aerosil® and Nanosav against adults
of Rhyzopertha dominica F. and Tribolium confusum Jacquelin du Val. Silica nanoparticles were applied at the rates of 50, 100, 200 and
300 mg · kg–1 on wheat and peeled barley. The mortality was counted after 1, 2, 3, and 7 days of exposure. Another experiment was
carried out to evaluate the effect of food source on the survival of beetles after exposure to silica nanoparticles. Adults were exposed to
silica nanoparticles at the rate of 0.2 mg · cm–2 for 1 and 2 days on filter paper inside plastic Petri dishes, respectively. After exposure,
the initial mortality was counted and live individuals of both species were held for a week in empty glass vials or vials containing
wheat and wheat flour, respectively. Silica nanoparticles have high toxicity on R. dominica and T. confusum adults. Rhyzopertha dominica
was more susceptible than T. confusum. However, the mortality of both species increased with increasing concentrations and time
exposed to each concentration. At low concentrations, Aerosil® was more effective than Nanosav. Silica nanoparticles were more
effective in wheat grains than barley. Results indicated that the initial mortality was so high that the impact of food source on delay
mortality was unclear in most cases. Silica nanoparticles were efficient against tested species and can be used effectively in a stored
grain integrated pest management program.
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