Authors : R.G. Patil
Page Nos : 158-161
Description :
Insecticidal and pharmacological properties are recognized in the plant Lasiosiphon eriocephalus. Different concentrations such as 175, 200, 225,250, 275 and 300 ppm of extract of leaves of plant Lasiosiphon eriocephalus are prepared. The 4th instar larvae of mosquito Aedes aegypti and Anopheles stephensi are exposed to the concentrations 175, 200, 225,250, 275 and 300 ppm for 48 hrs. to study the mortality of larvae for 2,4,8,12,24 and 48 hrs. From the mortality table the values of ‘a’ and ‘b’ are calculated and with the help of these values the LC50 values of phytotoxin L. eriocephalus to the larvae of mosquito A. egypti are calculated and these LC50 values are observed as 288.63, 283.47, 240.81, 213.07, 202.06 and 184.13 ppm respectively for 2,4,8,12,24 and 48 hrs where as LC50 values of this phytotoxin to the larvae of A. stephensi are observed as 318.71, 240.08, 224.06, 210.14, 198.62 and 187.25 ppm respectively for 2,4,8,12,24 and 48 hrs. There results revealed that phytotoxin from plant L. eriocephalus can be used as efficient source in the control of mosquito A. aegypti by destroying the larval stage.
