イネの有機栽培がウンカ・ヨコバイ類の個体群密度に及ぼす影響 : I.密度および増殖率

概要

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We studied the effects of organic farming of rice plants in a paddy and in a chemically-fertilized plot, a poultry-manured plot and a non-fertilized plor on the population densities of the green leafhopper, Nephotettix cineliceps UHLER, the white-backed planthopper, Sogatella furcifera HORVATH, and the brown planthopper, Nilaparvata lugens STÅL. The density of the green leafhopper in the organically-farmed paddy was the lowest probably due to the low population density during the fallow period. The density of the white-backed planthopper in the organically-farmed paddy was the lowest because the reproductive rate was extremly low. The density of the brown planthopper in the organically-farmed paddy was also the lowest. The density of natural enemies in the organically-farmed paddy was lower or similar to that in the other polots. Therefore, natural enemies did not contribute to the lower density of leafhoppers and planthopers in the organically-farmed paddy.
日本応用動物昆虫学会の論文
1993-08-25