Monitoring of resistance in Spodoptera exigua (Lepidoptera: Noctuidae) from four districts of the Southern Punjab, Pakistan to four conventional and six new chemistry insecticides

摘要: Abstract The present studies were carried out to evaluate resistance in Pakistani populations of beet armyworm, Spodoptera exigua (Hubner) various insecticides. Different field S. exigua from four districts the Punjab monitored 2008 2010 for against insecticides using a standard leaf dip bioassay method. For pyrethroids and organophosphates, ratios compared with susceptible Lab-Pk population range 7–105-fold deltamethrin, 12–136-fold cypermethrin, 20–134-fold chlorpyrifos 37–143-fold profenofos. new chemistry insecticides, levels 3–73-fold spinosad, 5–226-fold abamectin, 6–88-fold indoxacarb, 3–75-fold emamectin benzoate, 2.4–59-fold lufenuron 3–41-fold methoxyfenozide. pairwise correlation coefficients LC 50 values indicated positive cross-resistance among cypermethrin chlorpyrifos, whereas profenofos showed correlations resistances other except chlorpyrifos. no any tested There high very organophosphates most populations, which suggested that these should be avoided this pest. Selective use some areas including Multan Khanewal, where they low level resistance, would appear acceptable. insecticides; lufenuron, methoxyfenozide, indoxacarb had no, low, moderate respectively. These are also considered environmentally safe safer natural enemies. Due characteristics could used IPM programs supplemented bio-control agents such as Nuclear Polyhedrosis Virus (NPV), enemies parasitoids predators. Rotation different mode action have or helpful management insecticide .