Hatching rate of eggs and mortality of lst stage nymphs of maternal German cockroach treated with insecticides

Hirakoso Shunnosuke, Mizutani Kiyoshi

doi:10.7601/mez.12.220

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Other Title

チャバネゴキブリに対する薬剤処理が, その保持した卵の孵化及び孵化幼虫の生死に与える影響について
チャバネゴキブリニタイスルヤクザイショリガ , ソノホジシタタマゴノフカオヨビフカヨウチュウノセイシニアタエルエイキョウニツイテ

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Description

After the treatment of insecticides to female cockroaches, Blattella germanica L., by contact method, topical application method and injection method, observations were made on the dropping of egg capsules, the hatching rate of the eggs and the mortality of their lst stage nymphs. All capsules were dropped after knockdown of the maternal roaches by the treatments of dieldrin, chlordane, diazinon, DDVP and dibrom. Though the knockdown time of the roaches treated with dieldrin and chlordane was nearly equivalent, the time of dropping of egg capsules was faster in dieldrin than in chlordane. This may be ascribed to the difference of insecticidal mechanism in these two chemicals. Hatching of the eggs laid by the roaches treated with the above mentioned five chemicals were seen only within 5 to 10 days after their capsules dropped, but no hatching was seen later. The nymphs from the roaches treated with DDVP and dibrom survived normally, and those from the roaches treated with diazinon, chlordane and dieldrin took two courses : the one died within 4 days entirely or partly after hatching and the other survived normally.

Journal

Medical Entomology and Zoology

Medical Entomology and Zoology 12 (3), 220-225, 1961

The Japan Society of Medical Entomology and Zoology

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