Abstract
Study was conducted to test four insecticides, profenofos, emamectin benzoate,
λ-cyhalothrin and lufenuron against two field populations of Plutella xylostella
and Spodoptera litura at different larval instars during 2010-11. The field
populations collected from Rawalpindi and Taxila cauliflower fields was tested
using leaf dip bioassay method under laboratory conditions. Results showed that
emamectin benzoate was the most toxic insecticide for both P. xylostella and S.
litura. However, profenofos was the second most toxic insecticides to different
larval instars of S. litura and λ-cyhalothrin to P. xylostella. High LC50 values for
lufenuron for this limited time exposure might be due to its slow acting as chitin
synthesis inhibitor. Emamectin benzoate can be suggested as the most effective
insecticides against both field populations along with profenofos and λ-
cyhalothrin.
Muhammad Imran, Munir Ahmad, Kanwal Hanif, Muhammad Nasir, Umer Ayyaz Aslam Sheikh. (2017) Comparative Toxicity of Insecticides against Two Important Insect Pests of Cauliflower Crop, Asian Journal of Agriculture and Biology, Volume 5, Issue 2.
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