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A study was carried out to reveal the toxicity of crude extracts obtained from leaves of herbs to the developmental stages of mosquito, Aedes aegypti. Further, experiments were conducted to find out the effect of the plant leaf extracts on certain indices of development of mosquito larvae viz., development period, rate of population, rate of emergence, survival rate and growth index. LC50/ 24 hours values of four plants to I, II, III, IV instars and pupae of Aedes aegypti were also calculated. The data indicated that there was a considerable increase in the LC50/24 values with the age of larvae. Compared to control period of development, form I instar to pupa, extended in the larvae reared in medium of plant extracts. Survival rate and growth index for mosquito larvae were remarkably reduced when treated with plant extracts. To conclude, the leaf extracts of the plant could be used for the control of mosquito larvae. Kirganelia reticulata leaf extract found to possess relatively higher toxicity.

kongunadu research journal

STUDIES ON TOXICITY OF CERTAIN PLANT EXTRACTS TO LARVAE OF THE YELLOW FEVER MOSQUITO, AEDES AEGYPTI, WITH A NOTE ON THEIR EFFECT ON DEVELOPMENT OF THE MOSQUITO LARVAE