番茄晚疫病是一种流行性很强的真菌病害。近年来,随保护地面积的增加,危害也越来越重,一般减产22—30％,严重的可造成绝收。 番茄晚疫病主要为害叶片和果实,在我省各地可周年发生。在不加温的中、小棚和改良阳畦发病重,一般3月即出现中心病株,多发生在棚室地势低洼和结露处,条件适宜时中心病株迅速扩展蔓延,4月中下旬为病害流行期。此期遇到春寒,温 Late blight is a highly epidemic fungal disease. In recent years, with the increase in the area of ​​protected areas, the harms are also getting heavier and heavier, with a general reduction of 22-30%, which can lead to serious accidents. Tomato blight is the main damage to leaves and fruits around the province to occur annually. In the non-warming, the shed and improve the severity of the sunburns, usually in March that the center of diseased plants, occurred in the low-lying shelter and condensation at the center conditions suitable for the rapid expansion of the spread of the center case, in late April Disease epidemic period. This period of spring cold, warm