Comparative effect of residues of several insecticides against German cockroaches after exposing them in different time

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  • Shirai Mitsuko
    Department of Parasitology, Institute for Infectious Diseases, University of Tokyo:S.S. Pharmaceutical Co., LTD.
  • Hirakoso Shunnosuke
    Department of Parasitology, Institute for Infectious Diseases, University of Tokyo
  • Suzuki Takeshi
    Department of Parasitology, Institute for Infectious Diseases, University of Tokyo

Bibliographic Information

Other Title
  • 接触時間の異なる数種殺虫剤のチヤバネゴキブリ成虫に対する効力比較
  • 接触時間の異なる数種殺虫剤のチャバネゴキブリ成虫に対する効力比較
  • セッショク ジカン ノ コトナル スウシュ サッチュウザイ ノ チャバネゴキブリ セイチュウ ニ タイスル コウリョク ヒカク

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Description

The effect of six insecticides on German cockroach, Blattella germanica L., was compared by exposing the insects to the residues for 0.5, 2, 5, 10 and 20 minutes. Half cc of WHO DDT (30%), dieldrin (5%), chlordane (5%), lindane (5%), malathion (5%) and diazinon (5%) was applied to a veneer plate of 10cm×10cm. After drying the plates for 1 day, roaches were exposed to them. After exposing for the limitted minutes, the roaches were transfered to clear pots. The knockdown percentage and the mortality were recorded thereafter. The results were as follow : 1) The longer the exposure time was, the higher the knckdown percentage after six days was, except in the case of DDT to female and male roaches and of malathion to male ones. To gain knockdown of 90%, the following exposure time was necessary; in dieldrin, chlordane and diazinon 4-6 minutes to female, 0.5-2 minutes to male; in lindane over 40 minutes to female, 6.3 minutes to male; and in malathion 18 minutes to male. 2) The rapidity of knockdown of the roaches after being exposed to the residues was degraded in the following order : lindane>diazinon, malathion≫chlordane>dieldrin>DDT. Some of the roaches exposed to the residues of lindane, diazinon or malathion were knocked down after 1 to 4 hours, but increase of knockdown percentage from 1 day to 6 days after the exposure was only little by little. On the contrary in the cases of dieldrin and chlordane, few roaches were knocked down within 4 hours, but thereafter the percentage increased remarkable. The action of DDT was slower and the effect was far less than the other chemicals tested. Some of the roaches exposed to lindane residue recovered after knockdown. Such result was remarkable in male roaches and in the case of shorter time of exposure. 3) Male roaches were more susceptible than female ones to all the chemicals tested except malathion to which female was slightly more susceptible. 4) In practical control program of German cockroach by painting the insecticides narrowly on the surface on which roaches would often crawl, dieldrin, chlordane and diazinon were admitted to be suitable and effective.

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