DISPERSAL AND GENE FLOW OF PESTICIDE RESISTANCE TRAITS IN PHYTOSEIID AND TETRANYCHID MITES

被引:34
作者
DUNLEY, JE
CROFT, BA
机构
[1] Dept. of Entomology, Oregon State University, Corvallis, 97331-2907, OR
关键词
D O I
10.1007/BF01200570
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Dispersal and gene flow of pesticide resistance traits in phytoseiid and tetranychid mites are discussed relative to their biologies and resistance management. The focus is on deciduous fruit-tree crops where Typhlodromus pyri Scheuten and Metaseiulus occidentalis (Nesbitt) can effectively control spider mite pests. Oregon populations of M. occidentalis were more dispersive than T. pyri, as evidenced by movement to small apple trees placed inside and outside of commercial apple orchards. This difference was corroborated by the spatial distributions of organophosphate resistance in populations from sprayed orchards and nearby unsprayed habitats: T. pyri showed patchy, local patterns of resistance while M. occidentalis showed more regional, homogeneous trends. Gene flow among populations was estimated from allozymic variation of T. pyri. Intra- and inter-population genetic variation was high enough to prevent population differentiation. Thus, allozymic estimates of gene flow were higher than that indicated by pesticide resistance patterns. Dispersal in Tetranychus urticae Koch is also discussed relative to resistance evolution. Immigration of resistant phenotypes from crops or other sprayed habitats can increase the frequency of resistance. Immigration of susceptible individuals from surrounding unsprayed habitat into a sprayed crop can slow resistance or lead to its reversion, depending on the level of gene flow between populations. Dispersal within crops can have the same effect if susceptibles come from a refuge. In pears, immigration of susceptible T. urticae from nearby habitat and groundcover aided in reversion of organotin resistance. Experiments on resistance management tactics for T. urticae are discussed.
引用
收藏
页码:313 / 325
页数:13
相关论文
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