日本応用動物昆虫学会誌
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
原書
隔離分布地において地中の寄主幼虫に壊滅的な死亡をひきおこしたツクツクボウシタケ(子嚢菌門:ボタンタケ目)の大量発生
磯野 昌弘
著者情報
ジャーナル フリー

2021 年 65 巻 3 号 p. 133-141

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抄録

Mushroom-like synnemata of the entomopathogenic fungi, Isaria cicadae Miq.(Ascomycota: Hypocreales), appeared gregariously on the ground of a Fraxinus japonica plantation, Takizawa City, Iwate, Japan, situated 170-km from the known geographic range of the fungi. The synnemata that grew inside the emergence trap for collecting the defoliators in the plantation grew 1.5-times more prominently than those on the outside, which lead to the present discovery. The micro-climate inside the trap was 23.7% darker, 2.8°C milder in the daily temperature changes, and 4.7% moister than that on the outside, which would promote the growth in height. The synnemata emerged uniformly throughout the plantation at a density of 8.86, 4.57, and 1.44/m2 in 2016, 2017, and 2020, respectively. A total of 125 specimens of the hosts dug out from the soil were all the last instar larvae of Meimuna opalifera(Walker)(Hemiptera: Cicadidae). The number of cicadas killed by the fungi on the plantation of 389 m2 was 3448, 1779, and 564 in 2016, 2017, and 2020, respectively. However, only 2, 5, and 6 cicadas survived in these respective years. The density increased and the catastrophic mortalities of the cicadas were found to be restricted to this plantation.

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