Characterization of resistance to clofentezine in populations of European red mite from orchards in Ontario

Resistance to clofentezine was identified in four populations of the European red mite, Panonychus ulmi (Koch), from apple orchards in Ontario after ca. 5 years use. Resistance was expressed at high levels (> 2000-fold at the LC 50) to clofentezine in a population selected in the laboratory. This...

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Bibliographic Details
Published in:Experimental & applied acarology 2002-01, Vol.27 (3), p.181-193
Main Authors: PREE, D. J, BITTNER, L. A, WHITTY, K. J
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Chemical control
Chlorobenzenes - pharmacology
Control
Fundamental and applied biological sciences. Psychology
Insecticide Resistance
Insecticides
Mites
Mites - drug effects
Mites - genetics
Mites - physiology
Ontario
Orchards
Pesticide Synergists - pharmacology
Pesticides
Pesticides - pharmacology
Phytopathology. Animal pests. Plant and forest protection
Population decline
Protozoa. Invertebrates
Selection, Genetic
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Summary:Resistance to clofentezine was identified in four populations of the European red mite, Panonychus ulmi (Koch), from apple orchards in Ontario after ca. 5 years use. Resistance was expressed at high levels (> 2000-fold at the LC 50) to clofentezine in a population selected in the laboratory. This population was resistant to hexythiazox and to the organotin compounds cyhexatin and fenbutatin-oxide. However, a population selected with fenbutatin-oxide did not show cross resistance to clofentezine. The clofentezine-resistant population was not resistant to pyridaben, propargite or dicofol. The synergists, piperonyl butoxide and DEF, were ineffective in overcoming the resistance. Resistance to clofentezine declined rapidly in a mixed population (most resistance was lost in fewer than three generations). There were several fitness factors (fewer eggs/female, longer egg stage, longer development time for males) associated with the resistant population which may have contributed to the loss of resistant phenotypes. However, in a second test in which selection was removed from a resistant population, resistance persisted for at least 10 generations. Observations on field populations indicated that resistance persisted for at least two seasons.
ISSN:0168-8162
1572-9702
DOI:10.1023/A:1021624421016