田间不同品种蔬菜对萝卜蚜种群的影响(英文)

本试验通过利用５个品种蔬菜（萝卜，芥蓝，芥菜，菜芯和白菜）研究萝卜蚜（Ｌｉｐａｐｈｉｓ ｅｒｙｓｉｍｉ）在不同蔬菜上的种群动态以及对寄生于萝卜蚜的菜蚜茧蜂（Ｄｉａｅｒｅｔｉｅｌｌａ　ｒａｐａｅ）种群的影响。研究结果显示，在３０天研究期间，有翅萝卜蚜的平均虫口（蚜虫数／苗）在萝卜、芥蓝、芥菜、菜芯和白菜苗上分别为３．９１８、０．８３１、１．１４９、１．７４３和５．２３头，表明降落在萝卜苗上的有翅蚜数量显著地比在其它蔬菜苗上的高；而无翅萝卜蚜的中均虫口分别为６３．４２１、１０．０４１、２４．９２８、２３．３２３和１１４．３０８头，说明萝卜蚜无翅蚜在白菜上的种群显著地高于其它品种蔬菜上的。由于萝卜蚜在不同品种蔬菜上的种群不同，导致菜蚜茧峰种群在不同品种蔬菜上也不同，其僵蚜虫口分别为１．０５６、０．２５１、０．２７７、０．６５１和１．４４头，显示了在萝卜和白菜上的僵蚜数量显著地比其它蔬菜上的高。分析结果表明，萝卜蚜的种群（ｘ）与菜蚜茧峰的种群（ｙ）呈显著的相关关系：ｙ＝０．１１８８＋０．０１４３ｘ（ｒ＝０．９７３９）。本研究还利用试验结果提出了萝卜蚜无翅蚜种群从蔬菜在田间种植后达到防治指标（５０头／苗）的临界天数（ｃ

EFFECTS OF HOST PLANTS ON POPULATION DYNAMICS OF LIPAPHIS ERYSIMI (KALT.) IN THE FIELD

The population dynamics of alates and apterous of turnip aphid (TA ) Lipaphis erysimi (Kalt.) together with the incidence of parasitism by Diaeretiella rapae (M'Intosh) on five host vegetable varieties in the field were evaluated. The results showed that the average populations of TA apterous on host vegetable varieties turnip, Chinese hale, leaf mustard, flowering cabbage and Chinese cabbage were 63.425, 10.041, 24.928, 23.323 and 114. 308 aphids/plant, respectively. The critical day' was used to estimate the date when TA population density on host vegetable varieties reaches its economic threshold. The relationship between TA apterous population (x) and mummy aphids parasitized by parasitoid D. rapae was significant, and the regression formula is y=0.1211 0.0143x (r=0. 9739).