Joint Action of Spinosad and Sweet Almond Oil Mixture against the Saw Toothed Grain Beetle, Oryzaephilus surinamensis (L.)

Document Type : Original Article

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Plant Protection Department, Faculty of Agriculture, Benha University, Egypt

Abstract

Bioassay tests were conducted to determine the combined action of spinosad and sweet almond oil against the adults of Oryzaephilus surinamensis (Coleoptea, Silvanidae), at 28 ±2°C and 65±5% RH and 21 days exposure period. The tests were applied at different concentrations, 6 for spinosad, 5 for sweet almond oil and 4 for their mixtures. The results indicated that the mortality of tested insect increased with increasing in the concentration and the exposure period. The mortality of O. surinamensis adults reached 98.0% using a concentration of 1 × 10-3 % (w / w) of spinosad on the day 21 of the exposure. Data also revealed that, the spinosad pesticide was very toxic for the treated insect, and it gave LC50 of 8.6×10-4 % (w/w), for the adults of O. surinamensis (after 7 days exposure period). The mortality effect of sweet almond oil on O. surinamensis adults reached 98.0% at concentration of 5% (v/w) on the day 21 of exposure. Data showed that, the sweet almond oil gave LC50 of 4.521% (v/w), for the adults of O. surinamensis (after 7 days exposure period). The efficacy of the two tested compounds as a mixture at the various concentrations indicated that spinosad and sweet almond oil mixture of LC20 spinosad + LC20 sweet almond was the most effective compared with other mixtures against O. surinamensis on the basis of co-toxicity factor.

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Annals of Agricultural Science, Moshtohor
Volume 58, Issue 3
September 2020
Pages 665-672

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