随着效益农业的发展和市场流通体系的完善,我县西瓜种植面积迅速扩大,1995～1999年,平均每年种植面积在650ｈｍ2以上,成为我县农民增收的主要种植项目之一。但随着西瓜的连年种植,病害发生种类增多,为害趋势加重,从而制约着西瓜产量和品质的提高。为此,1997～1999年我们开展了 With the development of effective agriculture and the improvement of market circulation system, the area under watermelon cultivation in our county has rapidly expanded. From 1995 to 1999, the average annual acreage was above 650hm2, making it one of the main planting projects for farmers to increase their income. However, with the successive planting of watermelon, the occurrence of disease types increased, the damage tended to be aggravated, thus restricting the yield and quality of watermelon. For this reason, we carried out from 1997 to 1999