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Pakistan Journal of Biological Sciences
  Year: 2003 | Volume: 6 | Issue: 6 | Page No.: 563-565
DOI: 10.3923/pjbs.2003.563.565
 
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Relative Efficacy of Different Insecticides Against the Second Instar Larvae of American Bollworm (Helicoverpa armigera (Hub.)) of Cotton

Muhammad Hamed and Muhammad Zahid

Abstract:
Efficacy of five insecticides viz., Polytron-C (440EC), Curacron (500EC), Azofas (20/400EC), Thiodan 35EC and Karate 5EC was compared with their recommended doses against 2nd instar larvae of American bollworm (H. armigera Hub.) under controlled laboratory conditions. Polytron-C & Curacron showed hundred percent mortality (100%) after 24 h of application followed by Thiodan (85.33%), Azofas (74.66%) and Karate (61.33%). Mortality was maximum after 48 hours by Azofas (100%) followed by Thiodan (98.66 %) and Karate (93.33 %).Thiodan and Karate also produced 100% mortality of larvae after 72 h of application.The results concluded that Polytron-C and Curacron are the most effective insecticides against 2nd instar larvae of, H. armigera (Hub.) followed by Azofas, Thiodan and Karate.
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How to cite this article:

Muhammad Hamed and Muhammad Zahid , 2003. Relative Efficacy of Different Insecticides Against the Second Instar Larvae of American Bollworm (Helicoverpa armigera (Hub.)) of Cotton. Pakistan Journal of Biological Sciences, 6: 563-565.

DOI: 10.3923/pjbs.2003.563.565

URL: https://scialert.net/abstract/?doi=pjbs.2003.563.565

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