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Articles by V.K. Dilawari
Total Records ( 2 ) for V.K. Dilawari
  Amit Sethi and V.K. Dilawari
  Cotton, Gossypium hirsutum L. is a chief fiber crop of India and contributes significantly to Indian agricultural and industrial economy. Its economic cultivation is very much affected by insect pest infestations. Whitefly, Bemisia tabaci (Genn.) has attained a status of key pest among these insect pests and the main reliance has been on the use of insecticides for its management. Insecticide resistance develops more readily due to their injudicious and indiscriminate use by growers. Thus, it is imperative to test the level of resistance to design a successful insecticide resistant management program. In this study, the resistance level to triazophos, endosulfan and imidacloprid were determined in whitefly populations from cotton growing areas of India. Whitefly populations from seven different locations; Guntur, Coimbatore, Kolar, Ludhiana, Bathinda, Sri Ganganagar and Sirsa were tested for resistance at two discriminating doses (0.25 and 1%) of each insecticide. Populations from all locations displayed widespread resistance to triazophos, endosulfan and imidacloprid with highest in Bathinda and lowest in Coimbatore. High resistance levels were recorded in populations from North India compared to populations from south India against all three insecticides. Whitefly populations from all locations did not show any resurgence against any insecticide.
  Amit Sethi , M.S. Bons and V.K. Dilawari
  Whitefly, Bemisia tabaci (Gennadius) is a serious pest of many economic crops through out the world. Farmers depend highly on insecticide usage to manage this pest. In this study, we investigated the capacity of field collected whitefly populations from different crops to develop resistance against imidacloprid, bifenthrin and fenvalerate by selecting up to 8 generations. Selection pressure was given by exposing the adults to insecticides using the treated leaf discs in the Petri dishes at the dosages sufficient to give 60-80% mortality. After 8th generation, strains selected with these three insecticides exhibited 21.90, 7.12 and 4.13-fold increase in tolerance for the three insecticides, respectively. The realized heritability of insecticide resistance was very high in imidacloprid-selected strains compared to bifenthrin and fenvalerate-selected strains. This indicated a high level of risk in the field populations for the development of resistance to imidacloprid compared to bifenthrin and fenvalerate. The mode of inheritance of insecticide resistance was found to be controlled by nearly completely recessive more than one gene.
 
 
 
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