Issue Description


Authors : R G Patil

Page Nos : 37-39

Description :
The larvae of Aedes aegypti and Anopheles stephensi were exposed to the different concentrations such as 175, 200, 225, 250, 275 and 300 ppm of phytotoxin from the plants Lasiosiphon eriocephalus and Tridex procumbens for 2, 4, 8, 12, 24 and 48 hrs. The LC50 values of both phytotoxins were compared to study the comparative toxicity of the phytotoxins. The LC50 values of the phytotoxin from L. eriocephalus to the larvae of mosquito A. aegypti are 288.63, 283.47, 240.81, 213.07, 202.06 and 184.13 ppm where as LC50 values of the larvae of mosquito A.stephensi are 318.71, 240.68, 224.06, 210.14, 198.62 and 187.25 ppm respectively for 2, 4, 8, 12, 24 and 48 hrs. The LC50 values of the phytotoxin from T. procumbens are 251.79, 242.36, 230.51, 221.86, 184.13 and 151.18 ppm for the larvae of A. aegypti and 257.99, 240.81, 230.51, 216.65, 182.76 and 156.10 ppm for the larvae A.stephensi respectively for 2, 4, 8, 12, 24 and 48 hrs. The mortality in the larvae is related to the concentration of phytotoxins and exposure period. The toxicity of the phytotoxin from T. procumbens is comparatively higher than the toxicity of phytotoxin L.eriocephalus from the larvae.

Date of Online: 30 Jan 2020