Abstract

Volatile blend of cotton leaves extracted in Steam distillate was found to play some decisive role in insect attractions when evaluated through various field and laboratory bioassays. TLC and GC-MS analysis and identification of steam distillate of highly susceptible cotton variety S-12 and resistant variety Ravi showed some qualitative and quantitative differences. Susceptible varieties indicated the presence of greater potential of mono-terpenes (α-pinene myrcene, limonene and ocimene etc), while resistant variety Ravi possessed more β-pinene. An unidentified compound showed 96% peak intensity in S-12 and 34% in Ravi. Cis form of caryophyllene was present in S-12 while Ravi possessed trans- caryophyllene and α-terpeniolene was only present in Ravi.

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