Species composition of predators of spider mites in persimmon orchards in Nara Prefecture with reference to the effect of weed management.

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  • カキ圃場でのハダニ類に対する土着天敵相，特に下草管理が土着天敵類の発生に及ぼす影響
  • カキ ホジョウ デ ノ ハダニルイ ニ タイスル ドチャク テンテキソウ トクニ シタグサ カンリ ガ ドチャク テンテキルイ ノ ハッセイ ニ オヨボス エイキョウ

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Abstract

The species composition of predators for spider mites was examined by using kidney bean trap infested with spider mites that were placed on the ground in persimmon orchards in Nara Prefecture. The most dominant phytoseiid mite in the orchards was Neoseiulus womersleyi. The predacious insects observed were Feltiella sp., Orius spp. and Scolothrips takahashii.<BR>The occurrence of predators was compared between orchards with and without weed control, using kidney bean traps placed on the ground and the ‘phyto traps’ attached to persimmon twings. Significantly fewer phytoseiid mites were captured by the kidney bean trap in the orchard without weeds than in that with weeds. However, no significant difference was observed in the number of Feltiella sp. larvae and the number of phytoseiid mites captured in the ‘phyto trap’ between two treatments. The seasonal occurrence of phytoseiid mites estimated based on the numbers in the ‘phyto traps’ also showed no difference between two types of weed control during the census period. No N. womersleyi was found in the ‘phyto traps’ on persimmon trees, although it was the most abundant species captured by the bean traps.

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