近年来,义县保护地蔬菜生产快速发展,棚室生产的主要蔬菜西葫芦的栽种面积全县已达3 300hm2,年产西葫芦25万t,产值5亿元。然而,由于西葫芦灰霉病的为害,严重阻碍西葫芦生产的发展。据调查,一般年份,西葫芦灰霉病发病率达15%～20%,高的50%左右;重发生年份,发病率达30%～50%,高的 In recent years, the rapid development of vegetable production in Protected Areas in Yixian County has witnessed a planting area of ​​3 300hm2 of the main vegetable zucchini in the greenhouse, with an annual output of 250,000 tons of zucchini and an output value of 500 million yuan. However, the development of zucchini production is seriously hindered by the botrytis cinerea. According to the survey, in general years, the incidence of gray mold disease of zucchini reaches 15% -20% and high about 50%; in the year of re-occurrence, the incidence rate is up to 30% -50%