チャドクガの死亡要因および蛹捕獲トラップ捕獲効率調査

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  • Studies on mortality factors of the tea tussock moth, Arna pseudoconspersa (Lepidoptera, Lymantriidae), and the efficiency of a pupation-site trap
  • チャドクガ ノ シボウ ヨウイン オヨビ ヨウホカク トラップ ホカク コウリツ チョウサ

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We examined the mortality factors of the eggs and larvae and the pupation site of the tea tussock moth, Arna pseudoconspersa (Lepidoptera, Lymantriidae). Two parasitoid wasps, Telenomus sp. (Platygastridae) and Trichogramma sp. (Trichogrammatidae), were seen on the eggs, and the resulting mortality rates of the eggs were 24.0% and 0.1%, respectively. In the young larval stage, the number of larvae decreased by 60% in the field and 30% in the laboratory. Because no parasitoids emerged from 2nd instar larvae, the young larvae might have been affected largely by predators and weather. Few larvae died after the young larval stage, and only one parasitoid, a tachinina fly (Tachinidae), was recorded on 6th instar larvae at a rate of just 4%. Our survey on the pupation site revealed that most full-grown larvae clambered down the host trunk and chose the nearest neighboring litters on the ground as their pupation sites. Considering pupation sites, the combination of gathering litters around the trunk during the time the larvae are full grown and removing the larvae after pupation could largely decrease the moth population. We also developed a pupation-site trap by wrapping the trunk and investigated its utility. The pupation-site trap could catch moth pupae as efficiently as the method of gathering and removing litters.

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