Clofentezine and hexythiazox resistance in Tetranychus urticae Koch in Australia |
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Authors: | Grant Herron Victor Edge Jeanette Rophail |
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Institution: | (1) NSW Agriculture, PMB 10, 2116 Rydalmere, Australia |
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Abstract: | Clofentezine resistance in T. urticae was first confirmed in Australia in 1987 after Queensland glasshouse roses had been exposed to 40 applications of clofentezine over a 10 month period. Clofentezine resistance in this strain was extremely high (>2.500x) and conferred high level cross-resistance to the chemically unrelated compound hexythiazox. Clofentezine resistance in T. urticae was detected in pome fruit orchards in the Goulburn Valley, Victoria in 1988 and caused field control failure after 5–6 sprays. Resistance was subsequently detected in Adelaide during 1988 and the Bathurst Orange region, NSW in 1989. Clofentezine and hexythiazox resistance appears particularly stable making it difficult to manage.This work contributes in part for the fulfilment of the requirements of the degree of PhD. at the University of Sydney. |
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