Comparative Study of Two Synthetic Insecticides Spiromesifen and Thiamethoxam to Determine their Acute and Residual Toxicity against Lynx Spider (Oxyopes javanus)
Comparative Study of Two Synthetic Insecticides Spiromesifen and Thiamethoxam to Determine their Acute and Residual Toxicity against Lynx Spider (Oxyopes javanus)
Hina Nazli, Abida Butt*
ABSTRACT
ntegration of biological and chemical control methods are required to successfully manage insect pests. Along with insect pests, many predators of these pests are also present in crops and affected by these management activities. Spiders are the most abundant predators of insect pests in the agroecosystem. The present study was designed to assess and compare acute and residual toxicity of two insecticides i.e Spiromesifen and Thiamethoxam on the lynx spider Oxyopes javanus Thorell, 1887 under laboratory conditions. The field rate of both insecticides caused approximately 50% mortality in the population of O. javanus. Toxicity data showed that these insecticides are slightly harmful ( caused < 80% mortality) towards studied spider. Insecticide residues of different ages were used to evaluate the residual toxicity of both insecticides. Mortality in exposed spiders decreased with the increased age of the residues. The results of both assays showed that male spiders were more susceptible than female spiders in both acute and residual toxicity tests. The residues study data showed that spiromesifen is short- lived (< 5 days aged residues cause < 30% mortality) and that thiamethoxam is slightly persistent ( 5–15 days aged residues cause < 30% mortality).
Novelty Statement | The acute and residual toxicity of the tested insecticides, Spiromesifen and Thiamethox-am is determined first time on the male, female and total population of lynix spider Oxyopes javanus.
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June 2020
Vol. 35, Iss. 1, pp. 1-165
