Title: Monitoring of Insecticide Resistance to Helicoverpa Armigera (Hubner) in Cotton Growing Areas of Punjab
Abstract: The monitoring of insecticide resistance was carried out during 2005 crop season in cotton growing areas of Punjab state. In Mansa and Bathinda districts, LD50 values were 0.08, 0.26, 0.09, 0.98 and 0.05 μg per larva with resistance ratios of 4.2, 8.9, 1.5, 139.8 and 5.0 to chlorpyriphos, endosulfan, spinosad, cypermethrin and quinalphos, respectively. In Bathinda district, during August, LD50 values were 0.07, 0.12, 0.07, 0.26 and 0.03 pig per larva aith resistance ratios of 3.6, 3.7, 1.1, 37.0 and 3.0 than in October with LD50 values of 0.16, 0.25, 0.07, 1.41 and 0.07 μg per larva with resistance ratios of 8.2, 7.9, 1.2, 201.3 and 6.5 to chlorpyriphos, endosulfan, spinosad, cypermethrin and quinalphos, respectively. Cypermethrin resistance was found to be maximum (139.9 folds) in October in Mansa and Bathinda (37 folds) during August and 201 folds durrng Octoberr Other rnsecticides like chlorpyrrphos, endosulfan and quinalphos developed 3 to 9 folds resistance. Maximum level of resistance was observed to synthetic pyrethroids (cypermethrin). The population of H. armigera was susceptible to spinosad and it was most effective through out season.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 1
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot