関東地方におけるシロイチモジマダラメイガの生態と被害

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E.zinckenella is widely distributed in the southern half of Japan and seriously infests soy bean. However, this insect has not been investigated so far in Kanto district. This paper gives an account of field and laboratory observations on the bionomic and damage of the soybean caused by this pest at our experimental station. The insect was found to undergo mostly three broods a year. The first brood moths emerged from the beginning of June and the peak of emergence was observed from late June through early July. The first brood larvae attack the pea or very early maturiting varieties of soy bean. The second brood moths appeared from the end of July through the first half of August and the larvae infested the early and medium varieties of the soy bean, but they were far less in abundance than the first and third broods. The third brood moths appeared from late August through mid-September and the larvae attacked the late varieties of soy bean. The seasonal fluctuations in the number of eggs deposited and of the population of larvae in the soy bean fields were investigated at about 5 day intervals. The durations in which eggs were observed were well coincided with the duration of appearance of moths, and two large peaks were observed, one in July and another in September. The larvae were observed from late June with two population peaks, one in the latter half of July and another in the last 10 days of October and the first 10 days of November. The scarcity of the second brood larvae seems to be attributed to the facts that the host plants which are at suitable stage for oviposition are very rare at the time of the emergence of the first brood moth and that the severe heat of midsummer in the latter half of July which causes a high percentage of mortalities of first brood larvae in the pods. The damage of soy bean by the insect differed prominently among soy bean varieties owing to the maturing date of the varieties. The very early varieties were damaged seriously by the first brood larvae, and 30 to 50 per cent of the pods were infested. The early and medium varieties were hardly infested as the second brood is less abundant. However, the late and latest varieties were infested considerably by the third brood, 10 to 20 per cent of pod being infested.
日本応用動物昆虫学会の論文
1961-03-30

関東地方におけるシロイチモジマダラメイガの生態と被害

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