ニカメイガ第2世代幼虫による水稲の被害に対する深水栽培の影響

概要

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To investigate the effects of deep water culture of rice plants on the injury of the rice stem borer, Chilo suppressalis in its second generation, the rice plants were cultured in the water controlled 0,5,10,and 20 cm-depth for 40 days from the beginning of September to the middle of October after the eggs and the first instar larvae were inoculated on the rice plants. The injury, number of larvae and yields were surveyed at the time of harvesting. Percentages of the stems injured in rice plants cultured in the water of 0,5,10,and 20 cm-depth were 56.4,66.0,37.3,and 22.4%, respectively. That is, the injury of the second generation larvae decreased with depth of water except for 0 cm-depth. The yields were inversely correlated to the percentages of stems injured. Similar results were obtained in the field experiments in which the water depth was controlled 1-5 cm or 15-20 cm. However, effectiveness of deep water culture on the yields was not observed, although the percentages of stems injured were significantly different between shallow and deep water culture. This result seemed to be due to low level injury of the rice stem borer in experimental plots.
日本応用動物昆虫学会の論文
1985-05-25