Title: Cross-resistance of the imidacloprid-resistant population of Aphis gossypii Glover(Homoptera:Aphididae) to pymetrozine and other three pesticides and the effects of pesticide application on its biological characteristics
Abstract: In order to clarify the control effects of pymetrozine on imidaeloprid-resistant population of Aphis gossypii,and bring forward proposals on its management strategies,we used the wingless adult aphids of the imidacloprid-resistant population(RF_(27)),the Xiajin population(XJ)and the susceptible population(SS) to assay the cross-resistance of the RF_(27)to pymetrozine and other pesticides and the effects of pesticide application on its biological characteristics by using the dipping method,microspot method,biochemical method and systematic observation method,respectively.The results showed that the LD_(50)of pymetrozine to RF_(27)was 1.213×10~(-5)μg/aphid,to XJ was 8.506 x 10~(-5)μg/aphid,and to SS was 5.140×10~(-5)μg/aphid,so RF_(27)exhibited obviously negative cross-resistance to pymetrozine.The resistance ratio of RF_(27) to acetamiprid,nitenpyram and buprofezin was 2.35,2.98 and 1.71,respectively.Activities of carboxylesterases(CarE)and gluathione-S-transferases(GSTs)in RF_(27)were significantly higher than those in SS,suggesting that the enhancement of activities of CarE and GSTs would be the main metabolic mechanism of the occurrence of resistance.Pymetrozine had an obvious inhibition on the CarE and GSTs activities in RF_(27),XJ and SS.RF_(27)treated by pymetrozine showed developmental disadvantages,including the lower nymphal survival rate(only 64.60%),the lower net reproductive rate(10.39),the longer mean generation time(10.87 d),the lower intrinsic rate of natural increase and the finite rate of increase (0.21 and 1.23 respectively),and the lower relative fitness(only O.70).These results suggest that pymetrozine has high application value in controlling A.gossypii.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 2
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