洋葱是金乡县仅次于大蒜的另一大经济作物，年种植面积５０００hm２以上。１９９５年以前，洋葱种植面积小、分散，洋葱霜霉病只是零星发生，但近８a中，有６a大发生。大发生年份造成洋葱叶片大面积干枯死亡，一般地块减产２０％～５０％，成为制约本县洋葱生产的一大障碍。为 Onion is Jinxiang County, second only to garlic, another major cash crop, the annual planting area of ​​5000hm2 or more. Prior to 1995, onions were planted in small areas, scattered, and onion downy mildew only sporadically, but in the past eight years there was a large occurrence of 6a. Occurrence of large-scale annual death of large areas of onion leaves dead, the general mass production cut 20% to 50%, has become a major obstacle to the production of onions in this county. for