Species Composition of Predators of Spider Mites Surrounding the Chrysanthemum Fields in Nara Prefecture and Their Occurrence in Relation to Chemical Spraying

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  • 奈良県のキク圃場周辺のハダニ類の土着天敵相と薬剤散布状況が異なるキク圃場でのカブリダニ類の発生消長
  • ナラケン ノ キク ホジョウ シュウヘン ノ ハダニルイ ノ ドチャク テンテキソウ ト ヤクザイ サンプ ジョウキョウ ガ コトナル キク ホジョウ デ ノ カブリダニルイ ノ ハッセイ ショウチョウ

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The species composition of predators of spider mites was monitored by using kidney bean traps infested by spider mites that were placed on the ground around the chrysanthemum fields in Heguri, Nara Prefecture. The predominant phytoseiid mite species captured by the traps was Neoseiulus womersleyi. The next abundant predacious insect species was Feltiella sp.<br>　In the chrysanthemum fields infested by spider mites at a low density, no phytoseiid mites were found. In the fields frequently sprayed with chemicals that affected phytoseiid mites, phytoseiid mites were rarely observed even when the density of the spider mites on the chrysanthemums increased. However, in the field sprayed with chemicals only a few times, the number of phytoseiid mites increased when the spider mite density increased resulting in a decrease in the spider mite density.<br>　The phytoseiid mite, Neoseiulus womersleyi was found in the chrysanthemum field that was not sprayed with chemicals for more than 2∼3 weeks after harvest and where the occurrence of spider mites was observed.

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