蔬菜在其生长期中发生各种病害的可能性很高,但以苗期发病危害最为严重,这主要是由于幼苗期间根系不发达,吸收水肥的能力较差,对抗病的侵染能力较低。所以,一旦苗期发病如果防治不及时就会造成延误农时,影响产量;有的品种错过栽植时间将无法种植。此种教训在蔬菜生产中是极其深 Vegetables are most likely to develop various diseases in their growth period, but the most serious is the incidence of vegetables at the seedling stage. This is mainly due to the underdeveloped root system during the seedling period, poor water and fertilizer absorption ability, low. Therefore, once the seedling stage if the disease is not controlled in time will result in delays in agriculture, affecting the yield; some species will miss the planting time will not be planted. This kind of lesson is extremely deep in vegetable production