Studies on the toxicity of copper to the silkworm, Bombyx mori L.
Publication Date : 07/04/2017
Sericulture is an economic industry in India which contributes substantially to the poor and marginal farmers of drought prone areas. Pesticides usage is common to control fungal, pests and weeds in agriculture as well as sericulture in or around mulberry gardens. This practice results in chemical contamination of mulberry leaves. Feeding of such chemical contaminated leaves to silkworms often leads to poisoning of silkworms and causes lowering of cocoon yield. Therefore it is the need of the hour to establish preventive measure. Copper is known to be the constituent of different fungicides and it effects on non-target organisms and organism were affected by copper in a complex pattern related to growth, reproduction and survival. Hence there exists effect of copper on silkworm and also the studies on silkworm on exposure to copper are needed. For evaluation of copper toxicity the static bio-assay was followed where the biological response of the animal was recorded. LD50 for copper was determined using percent mortality, probit mortality and Dragsted and Beharns method in silkworm, Bombyx mori L(PM X CSR2) of Vth instar. The silkworms were exposed to various doses of copper for a period of 96h acute toxicity. 96h LD50 was established as 17.54 g/kg b.w. of Cu in Vth instar silkworm larvae.
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