チャバネゴキブリ<i>Blattella germanica</i>の増殖要因としてのシェルターの影響  [in Japanese] Influence of the harborages in increasing of German cockroach, <i>Blattella germanica</i>, in laboratory condition  [in Japanese]

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Abstract

25℃の室温で水と餌が十分に与えられてた場合,プラスチック容器内のチャバネゴキブリの増殖は,シェルターの材質や隙聞の数で変化した.シェルターがなければ,明らかに増殖が抑制された.ベニヤ板,陶製タイル,プラスチックのシェルターは,増殖の程度に差は見られなかったが,アルミ板ではこれらに比べて増殖が少なかった.また,シェルターの隙間の数が多くなると増殖が促進され,雌雄3対のチャバネゴキブリは,隙間の数が5個のベニヤ板製シェルターを設置した際,3ヶ月後に若齢若虫を中心に780頭に増加した.これらの結果,隙間が多い現場では,駆除後に少しの生き残りがあれば,個体群の復活は短期間で起こりえることが示唆された.

The harborage material and the void number of the harborages influenced increasing in German cockroach population in a laboratory condition. In case of the harborage free the cockroach numbers were rather small compared with the existence of the harborages. The cockroach numbers increased notably with the harborages made of plywood, ceramic tile or plastic, and less numbers in metallic one. The void numbers were also related to increasing in the cockroach population. The initial numbers of three pair of the cockroaches increased up to 780 in total after three months with 5 void plywood harborages, whereas a similarly reared colony without any harborage attained only 94 individuals. In three months after, the young stage of nymphs was the majority in each condition. The results suggest that cockroach populations can recover quickly after incomplete control in case of abundant of cracks and crevices.

Journal

  • Pest Control Research

    Pest Control Research 17(1), 29-32, 2002

    The Japanese Society of Pestology

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