• Bushra Saddiq

• Irfan Ashraf

• Muhammad Saqib

• Muhammad Bilal

• Asma Hanif

• Amber Raza

• Sana Fatima

• Mahwish Munir

Abstract

Several insect pests attack on canola crop but cabbage aphid, Brevicoryne brassicae is the most devastating pest affecting its quality and quantity. B. brassicae has ability to develop resistance against several conventional insecticides which are being used against this pest. The aim of present study was check the toxicity and resistance levels of selected new chemistry insecticides against different field populations of B. brassicae. Four populations collected from Rahim Yar Khan, Bahawalpur, Lodhran, and Multan were tested against selected new chemistry insecticides. Nymphs were used for bioassay through leafdip method. Resistance ratios were in the range of 1.00 to 2.11 folds for fipronil, 1.00 to 1.26 folds for spirotetramat, 1.00 to 2.36 folds for emamectin benzoate, 1.00 to 2.83 folds for spiromesifen, 1.00 to 1.49 for chlorantraniliprole, and 1.00 to 1.71 folds for flonicamid, compared to a reference susceptible strain. Information obtained from our results will prove helpful to delay insecticide resistance development in B. brassicae..

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