厚朴立枯病立枯病病原有非侵染性和侵染性两类。非侵染性发病主要是因为圃地积水、土壤板结、覆土过厚及以烈日曝晒等引起,使种芽腐烂,苗根窒息腐烂或日灼性猝倒。侵染性发病主要是病菌所致。病菌在土壤中越冬,早春播冻后就开始活动,在土壤温湿度适宜的情况下,侵染幼苗;另一方面病苗又为病菌提供养分,使其大量繁殖,从而继续传染。早涝霜冻土壤粘重、排水不良的圃地或在幼苗出土后2个月内连续下雨、土壤 Magnaporthese blight pathogen disease non-invasive and infective two categories. Non-invasive disease is mainly due to nursery groundwater, soil compaction, overburden and too thick sun exposure caused, so that germination decay, seedling suffocation decay or sunburn cataplexy. Infectious disease is caused mainly by bacteria. Germs in the soil overwintering, early spring after the start of activity after freezing, the soil temperature and humidity in the appropriate circumstances, the infection of seedlings; on the other hand the disease and bacteria to provide nutrients to make it a large number of breeding, and thus continue to be infected. Premature frost and frozen soil sticky, poor drainage in the nursery or seedlings within 2 months after the continuous rain rains, soil