The author studied the occurrence law of Plutella xylostella in the coastal areas of northern Jiangsu, including host plants, damage, biological characteristics and influencing factors. The results showed that: at the early flower bud stage of cauliflower, the natural logarithm value of the number of Plutella xylostella (X) was linearly correlated with the probability value of the cauliflower yield loss rate ( Y) , and the linear equation was Y = 2. 4183 ＋ 0. 6099X ( r = 0. 9900 ** ). Due to the influences by the combination of the diet and temperature, "two -peak" infestation of this pest insect in a year was observed. The causes of the heavy occurrence of Plutella xylostella in the local region in recent years were also analyzed in the paper, and its control strategy was discussed.%通过研究小菜蛾的发生规律,阐述了小菜蛾在当地的寄主、危害、生物学特性和影响因子.研究认为,花椰菜球花初期小菜蛾虫量的自然对数值(X)与花椰菜产量损失率的概率值(Y)呈线性相关,Y=2.4183+0.6099X,r =0.9900**；受食料条件与温度的共同影响,小菜蛾在当地呈全年双峰型危害.该文还分析了近年来当地小菜蛾发生较重的原因,探讨了防治策略.
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