マメシンクイガによる大豆被害の年変化について
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概要
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Soy bean pod borer is one of the most serious insect pests of soy beans in Hokkaido. This species has one brood in a year and the moth appears in August. The percentage of injured seeds caused by this borer shows a great deviation among soy bean varieties and also by years. In this paper authors described the results of their investigation on the yearly deviation of the injuries in Hokkaido. There was no correlation between the percentages of injured seeds over a period of fifteen years among five localities (Sapporo, Obihiro, Kitami, Teshio and Hayakita). This shows that the factors determining the deviation of injuries are not parallel in these five places. It was found from the records of the injuries of six soy bean varieties in Sapporo covering the past twenty years, that positive correlation was recognized between the percentages of injured seeds among the varieties where pod-formation periods were near and none among the varieties where pod-formation periods were distant. Then, a negative correlation between the mean temperature of July and the percentage of injured seeds was found in the varieties showing strong response to temperature and none among the varieties showing weak response to temperature. These facts may be understood when the period of moth appearance is accelerated by warmer temperature in July, as the percentage of injured seeds is influenced by the pod-formation period and varieties having an early pod-formation period are infested heavily. Consequently it follows that the change of the relation between the periods of moth appearance and pod-formation is one of the factors determining the yearly deviation of the injury. In Obihiro, positive correlation was recognized between mean temperature of September in the preceding year or of August of the current year and the percentage of injured seeds among varieties. This correlation was not observed to be a factor in Sapporo. It recent two years, 1955〜1956,a remarkable decrease in injuries occured all over Hokkaido. It seems that this decrease in injuries is due to the severe drop in the number of moths. From the facts above mentioned, it can be said that the factors concerning the yearly deviation of the injury are unlike both in location and in soy bean varieties, or the strength of these factors vary with the location places and the variety of the soy bean.
- 日本応用動物昆虫学会の論文
- 1958-06-01
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