チャバネゴキブリ<i>Blattella germanica</i> (L.)の生殖とmetepaの効果

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  • The Reproduction of the German Cockroach, <i>Blattella germanica</i> (L.) and Effect of Metepa on it
  • チャバネゴキブリ Blattella germanica L. ノ セイショク ト metepa ノ コウカ

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The reproduction of the German cockroach, Blattella germanica (L.) was studied in relation to the effect of metepa on it under laboratory conditions of 25°±1°C, at about 60% R.H. and 14 hours illumination a day. Newly emerged female adults began to mate 4 days after emergence, and almost all of them completed their mating by the 6th day after emergence. Thereafter the number of mating females decreased. Females once mated protruded three oöthecae successively from their abdominal tip with completely fertilized eggs without further copulation. Although the fourth and fifth oöthecae were protruded, the number of larvae hatched from them decreased. Newly emerged males mated 3 days after emergence, and almost all of them completed their mating by the 6th day after emergence. The survival period of male adults was 70 to 142 days, and they mated 10±5 times during this period. The frequency of copulation decreased with the advance of age. Females which had been topically treated with 25μg of metepa after 7 to 9 days from adult emergence were effectively sterilized. Males which had been topically treated with the same dose of metepa as females after 4 days from adult emergence, were completely sterilized. But the effect of metepa on male sterilization seemed to decrease when treated after 5 days. The sterilizing effect on males remained during their entire living period with no recovery. When a female copulated twice, with either a sterile or normal male before protruding oötheca, the fertility of eggs was more influenced by the 2nd copulation than the 1st. Sterilized males seemed to be inferior in their competitiveness for copulation to untreated males. But if number of males was almost the same as that of females, the inferiority of sterilized males in the copulation act could be neglected.

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