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Spiders are the most abundant group of predators in rice fields. The laboratory study carried out to evaluate the safety of neem based compounds and chemical pesticides to two major tetragnathid spiders in the rice fields brought out that neem compounds are far safer than chemical compounds. The mortality of Tetragnatha mandibulata and Tetragnatha maxillosa when treated with the synthetic insecticides like triazophos 0.05 per cent and quinalphos 0.05 per cent was extremely high ( 56.73 and 35.56 per cent and 64.78 and 46.79 per cent, respectively). Whereas, imidacloprid 0.005 per cent was found to be safer than the other chemical compounds. NSKE 5 per cent recorded the least mortality. Topical application of the compounds was found to be more fatal to spiders than indirect contact.
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