【摘要】 在杭州东郊于秋冬季节对菜蚜在青莱、甘蓝植株内不同叶位上的分布进行了系统调查。结果表明，桃蚜和萝卜蚜两种菜蚜，主要在嫩叶和老叶的背面取食，成叶背面也有一定数量，但萝卜蚜在成叶上的发生比率较桃蚜明显要高。混合种群在各类叶上的发生比率则依作物种类和生长期、两种蚜虫的发生比率及季节不同而变化。更多还原

【Abstract】 Within-plant distribution in relation to leaf position of aphids on Brassica campestris ssp.chinensis and the common cabbage were investigated in the vegetable fields in the eastern sub- urbs of HangzhOu during autumn-winter seasons。The results showed that the two aphids,namely Myzus persicae and Lipaphis erysimi,mainly fed on the underside of young and old leaves. There were also variable proportions of aphids feeding on the underside of mature leaves,but L. erysimi had comparatively much higher proportion of individuals feeding on mature leaves than M.persi- cae. The within-plant distribution of the mixed population of the two aphids varied with crop species,crop growth stages,relative proportions between the two aphids,and seasons.更多还原