Synchronization of adult female emergence of Fagineura crenativora and leaf opening of Fagus crenata : effect on larval feeding damage

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  • ブナハバチ雌成虫の発生とブナ展葉の同時性が被食量に及ぼす影響
  • ブナハバチ メス セイチュウ ノ ハッセイ ト ブナテン ヨウ ノ ドウジセイ ガ ヒショクリョウ ニ オヨボス エイキョウ

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Abstract

We investigated the influence of the number of emerging adult females on egg density and magnitude of feeding damage caused by larvae of Fagineura crenativora Vikberg & Zinovjev. We evaluated seasonal changes in adult female emergence on Mount Tanzawa over a 3-year period, by using yellow flight-interception traps. In addition, we recorded egg density, feeding damage, and seasonal changes in leaf opening of Fagus crenata Blume. Adult females were trapped for approximately 1 month, with a peak occurring over 1-2 weeks. The total numbers of adult females trapped in 2007, 2008, and 2009 were 191, 75, and 162, respectively. During 2007 and 2008, the peak season for trapping adult females corresponded with the leaf-opening stage of Fagus crenata, when the leaves were suitable for egg laying. In 2009, the peak season for trapping adult females occurred at a later stage. The numbers of adult females trapped during the leaf-opening stages in 2007, 2008, and 2009 were 166, 51, and 11, respectively. In 2007, the egg density was 36 eggs per 100 leaves, and feeding damage was severe. By contrast, in 2008 and 2009, the egg densities were 3 eggs per 100 leaves and 4 eggs per 100 leaves, respectively, and feeding damage was mild. Our findings indicate that maximum feeding damage occurs when the peak season for adult female emergence corresponds with the leaf-opening stage of Fagus crenata, which is suitable for egg laying.

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