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Silicon dioxide damages the protective waxy layer of insect body
and insects die due to desiccation. But, it is slow acting
insecticide and effective at high dose, so it is used in
combination with different insecticides.The under taken project
focuses on the laboratory bioassay of Twenty different ratios
between insecticide and silicon dioxide ranging from 1:0.0025 to
1:3 against adult female and ovisac stage.The mortality at adult
female and egg sac stage, as well as quantity of wax removed was
recorded.Intensity of synergistic effect on the toxicity of
insecticides against mealybug's stages increased with increasing
concentrations of silicon dioxide.The treatments, having silicon
dioxide admixed with insecticides, removed many fold wax from the
body of adult female than the treatments having only
insecticides.Percentage mortality was found higher in the adult
female as well as at ovisac stage at higher ratio and maximum at
1:3 (insecticide: silicon dioxide). The findings of the endeavour
persuaded the coadministration of silicon dioxide with insecticides
to synergize their toxicity as well as for the knockdown control of
cotton mealybug at adult female and ovisac stage.
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