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Population density of Monochamus alternatus adults (Coleoptera: Cerambycidae) and incidence of pine wilt disease caused by Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae)
Author(s) -
Togashi Katsumi
Publication year - 1988
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02513243
Subject(s) - monochamus alternatus , bursaphelenchus xylophilus , longhorn beetle , wilt disease , biology , population , xylophilus , population density , botany , pinus thunbergii , woody plant , ecology , horticulture , nematode , demography , sociology
Summary The seasonal occurrence of Monochamus alternatus and newly weakened trees were investigated in a Pinus thunbergii stand for 4 years. Adult beetles were present between June and September with a peak in their population occurring in early July followed by a decline then a period of about one month being in a steady number. The average number of Bursaphelenchus xylophilus (Nematoda), which is the causal agent of pine wilt disease, within beetles decreased as the season advanced. Pine trees newly weakened by B. xylophilus appeared between June and October, especially from August to October. The proportion of weakened or killed trees was directly proportional to the average beetle density per tree from June to August.