Abstract
Integration 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).
Hina Nazli, Abida Butt. (2020) Comparative Study of Two Synthetic Insecticides Spiromesifen and Thiamethoxam to Determine their Acute and Residual Toxicity against Lynx Spider (Oxyopes javanus), Punjab University Journal of Zoology, Volume 35, Issue 1.
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