近年来,张家口市充分发挥自然资源优势,以错季无公害蔬菜生产为突破口,使蔬菜产业得到了迅猛发展,成为全国五大蔬菜基地之一——夏、秋错季蔬菜基地。2008年全市蔬菜播种面积达8.67万hm2,其中十字花科蔬菜的种植面积达3.35万hm2。由于十字花科蔬菜的大面积种植,小菜蛾的发生和为害也随之日趋严重,一般造成蔬菜产量损失 In recent years, Zhangjiakou City gives full play to its advantages in natural resources and takes the production of pollution-free vegetables in the wrong season as a breakthrough point. As a result, the vegetable industry has witnessed rapid development and has become one of the five major vegetable bases in China. In 2008 the city sown vegetables area of ​​86,700 hm2, of which cruciferous vegetables planting area of ​​33,500 hm2. Due to the large-scale planting of cruciferous vegetables, the occurrence and damage of diamondback moth are also becoming more and more serious, resulting in the loss of vegetable yield