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Title: Detection of insecticide resistance in field populations of citrus mealybug Planococcus citri (Risso) (Hemiptera: Pseudococcidae)
Authors: Mruthunjayaswamy, Prathibha
Thiruvengadam, Venkatesan
Kumar, Jalali Sushil
Keywords: Acephate Biological pest control;Buprofezin;Dichlorvos;Imidacloprid;IPM;Pest control
Issue Date: Jun-2019
Publisher: NISCAIR-CSIR, India
Abstract: Planococcus citri (Risso) (Hemiptera: Pseudococcidae), commonly called citrus mealybug, is a major sporadic pest and found to cause severe yield loss in many fruit crops. Mealybugs are considered “hard to kill pests” using insecticides. In order to study the evolution of insecticide resistance in P. citri, we collected mealybugs from four major fruit crops and bioassay was carried out against four commonly used insecticides belonging to different groups followed by quantification of enzymes. The mortality study revealed evolution of very low to low level of resistance with resistance ratio(RR) ranging from 6.87-14.58-fold (acephate), 7.46-16.39-fold (dichlorvos), 2.00-9.50-fold (imidacloprid) and 9.83-12.75-fold (buprofezin). Elevated levels of detoxifying enzymes were observed in all field collected populations along with the evidence of significant positive correlation between insecticides (OP, imidacloprid and buprofezin) and enzymes (esterase, MFO and GST). The high selection pressure of acephate, dichlorvos and buprofezin in the field collected population could be attributed to the evolution of low level resistance resulting in control failure. Hence, it is suggested to use imidacloprid supplemented with biocontrol strategies for the management of P. citri.
Page(s): 435-442
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.57(06) [June 2019]

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