论文部分内容阅读
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
In this study, the population dynamics of Lipaphis erysimi in different vegetables were studied by using five varieties of vegetables (radish, kale, mustard, cabbage and cabbage) and the effects of Diaeretiella rapae on parasitized radish aphids, The impact of the population. The results showed that the average number of aphids (aphids / seedlings) in the radish, kale, mustard, and core of cabbage and cabbage seedlings was 3.918, 0.831 and 1.149 respectively during the 30-day study period , 1.743 and 5.23 respectively, indicating that the number of winged aphids that landed on radish seedlings was significantly higher than that of other vegetable seedlings. However, the average population of aphids without wingwort was 63.421,10.041 , 24.928, 23.323 and 114.308, respectively, indicating that the population of turnip aphid-free aphid in cabbage was significantly higher than that of other varieties of vegetables. Due to the different populations of radish aphid in different varieties of vegetables, leading to aphid cocoon peak population in different varieties of vegetables are also different, the aphid mouth were 1.056,0.251,0.277,0.651 and 1. 44 heads showed that the number of stiff aphids on radish and cabbage was significantly higher than on other vegetables. The results showed that there was a significant correlation between the population of radish aphids (x) and the population of aphid cocoon (y): y = 0.1188 + 0.0143x (r = 0.9739). Based on the results of the experiment, this study also proposed the critical days (days) for the population of A. frugiperda to reach the control index (50 heads / seedlings) after planting in the field (c