Studies were conducted on the contact toxicity of insecticides on six ecotypes of T. chilonis collected from Gudimangalam, Palladam, Udumalpet, Pongalur. Chingleput and Mettupalayam and the laboratory strain of T. chilonis from Coimbatore in Tamil Nadu revealed that phosalone was the most toxic to the ecotypes while quinalphos and monocrotophos were safe. All the ecotypes were superior to the laboratory strain indicating its deterioration due to constant mass culturing in the laboratory. Palladam ecotype was found to be more tolerant to the insecticides.
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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