EFFECT OF SELECTED SUB- LETHAL CONSITRATION OF SYNTHETIC PYRETHROID TESTED ON DIFFERENT DEVEL OPMENTAL STAGES OF DROSOPHILA MELANOGASTER
Synthetic insecticide namely fenvalerate was tested to know its effects on inactive development stages (egg, larvae, pupae and adults) of mutant form (Yellow) of Drosophila melanogaster. The toxicity of the fenvalerate was revealed by prolongation of developmental period and also reduction of population revent at sub-lethal dose 0.007μL/100 mL food. The fecundity and hatchability fall considerably due to the effect of given insecticide on gonadal development and also reveal the reduction of population of larvae, pupae and adult might be due to fenvalerate is the interference in the synthesis of chiten during moulting of larvae in to successive instars into the pupae. The new malformed cuticle cannot give sufficient support to the muscles involved in ecdysis, which results inability to caste the exuviae and partially free themselves but finally loose moisture, turned black and die. A significant fall of adult of both sexes died within the puparium due to inability to cast off puparium completely and the structure appeared between pupae and adult died within two days of their partial emergence and few adults died out of the puparium due to the abnormal adults with white body, emerged forcibly due to insecticide reaction.
To read the full article Download Full Article