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多年系统观察结果表明,如东县十字花科蔬菜发生的主要害虫有菜粉蝶、斜纹夜蛾、甜菜夜蛾、烟粉虱等。春季以菜粉蝶为主,发生高峰出现在5月下旬至6月上旬;秋季以斜纹夜蛾、甜菜夜蛾、烟粉虱为主,发生高峰出现在8月下旬至9月下旬。不同年份各种害虫发生期早迟和为害高峰略有变化。在田间实际用药时,应根据发生高峰出现的时间、发生的数量,确定防治适期和次数,多种害虫并发时,可结合起来进行总体防治。
Years of systematic observation showed that the main pests of cruciferous vegetables in Rudong County were cabbage butterfly, Spodoptera litura, beet armyworm and whitefly. Cabbage butterfly is the main species in spring, and the peak appears in late May to early June. In autumn, Spodoptera litura, Spodoptera exigua and Bemisia tabaci dominate. The peak appears in late August to late September. Different pests in different years and early stages of pest damage a slight change in the peak. In the field when the actual medication, should be based on the occurrence of the peak time, the number of occurrence, to determine the appropriate period and the number of prevention, a variety of pests concurrent, can be combined for the overall control.