Acceptability of harborages made of Japanese woods to the German cockroach, <i>Blattella germanica</i>

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  • 各種国産木材シェルターのチャバネゴキブリに対する忌避および誘引性
  • カクシュ コクサン モクザイ シェルター ノ チャバネゴキブリ ニ タイスル キヒ オヨビ ユウインセイ

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Harborages made of 30 species of Japanese wood were evaluated for acceptance to the German cockroach, Blattella germanica, as a hiding place. Two pieces of wood panels (25mm×60mm, 5mm thickness) were fastened at the edges to make a V-shaped harborage. The panels of lauan (Pantacme contorta) plywood were used for control harborages. A pair of test and control harborage was placed in the diagonal position in an arena and exposed to 10 male German cockroaches. Harborage acceptability or repellent index was determined by counting the number of cockroach feces dropped on each of the two-harborage corners after 48 hours. Fewer cockroaches selected the harborages made of Japanese oak, Quercus mongolia (NARA), breech, Fagus crenata (BUNA), Japanese zelkova, Zelkova serrata (KEYAKI), Sawara cypress, Chamaecypari pisifera (SAWARA), Japanese yew, Taxus cuspidata (ICHII) and paulownia, Paulomnia tomentosa (KIRI), compared with lauan plywood panels. The repellent indexes observed for these 6 species were 94.2, 88.0, 81.9, 79.2, 78.3 and 77.5, respectively. The cockroach preferred the harborage made of Spruce, Picea jezoensis (TOUHI), Japanese red ceder, Cryptomeia japonica (SUGI) and Pine, Pinus thunbergii (AKAMATSU) to the harborage of lauan plywood.

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