一、1.猝倒病:俗称掐脖烂、脚癌病。 (1)分布:各地均有发生。危害作物茄子、青椒、柿子、黄瓜、甜瓜、芹菜、洋葱等各种经济作物,树苗,大田作物的幼苗。严重时幼苗成片死亡。 (2)症状:幼苗则出土到真叶未形成前病苗茎基部呈水渍状,褐色倒伏而死。折倒的幼苗依然青绿,故称猝倒。在幼苗未出土前被害,胚茎和子叶腐烂。苗床发病初期先出现发病中心,再向周围扩展成片苗倒,菜农 First, 1. Dumping disease: commonly known as pinch neck rot, foot cancer. (1) Distribution: all over have occurred. Hazard crop Eggplant, green pepper, persimmon, cucumber, melon, celery, onion and other cash crops, saplings, field crops seedlings. Severe seedlings die. (2) Symptoms: the seedlings are unearthed to the true leaves did not form the front of the seedlings stem base was water-like, brown lodging died. Broke the seedlings are still green, it said cataplasm. Before the seedlings were unearthed, the embryo stems and cotyledons decayed. The early onset of seedbed disease center appears, and then expanded into patches around, vegetable farmers