Comparative Toxicity and Susceptibility Status of Commonly Used Insecticides against Plutella Xylostella in Punjab, India

Toxicity of some commonly used insecticides against multi-resistant populations of P. xylostella in Punjab was determined. The populations collected from Amritsar, Bathinda, Kapurthala, Patiala and Ropar fields were tested using leaf disc dip technique of bioassay. Based on the LC₅₀ values obtained, cartap-hydrochloride was found to be most toxic against all the pest populations with LC₅₀ values 0.045–0.162% followed by endosulfan and fenvalerate with LC₅₀ values 0.117–0.473 and 0.147–1.936%, respectively. Quinalphos was found to be least effective against all the populations with LC₅₀ values ranging from 0.609–2.522%.