Relationships between Mass Mortality of Two Oak Species (Quercus mongolica Turcz. var. grosseserrata Rehd. et Wils. and Q. serrata Thunb.) and Infestation by and Reproduction of Platypus quercivorus (Murayama) (Coleoptera : Platypodidae)

概要

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This study investigated the number of adults of Platypus quercivorus (Murayama) captured on host oak (Quercus spp.) trees, theattack density (the number of entry holes per 100 cm^2), and the number of emerging adults to clarify the relationships between thebeetle's colonization on trees in oak stands and tree mortality. The initial attack of P. quercivorus, which was the most intense attack,was observed on most living trees simultaneously. Although some attacked trees died within the year of the attack or in the next year,a high density of attack did not usually cause the death of host trees. Surviving trees suffered low levels of consecutive attack afterthe initial attack. Because P. quercivorus successfully produced broods only in the dead trees, the population of the insect seemsto be maintained only in stands where oak mortality occurs. However, the adults that landed on most of the surviving trees appearedunable to reproduce probably due to degradation of host quality. Thus, oak mortality probably ceases within 3 or 4 years after thestart of infestation in a stand, with subsequent reductions in population density of the borer.
一般社団法人日本森林学会の論文
2000-08-16