在茶园苗圃中,经常见到由于茶苗根部腐烂而死苗的现象。发生死苗的原因:一种是因腐霉菌的侵染而引起的;另一种是由于土壤积水过多,茶苗根部因长期浸水而窒息腐烂。两种根腐病以前者发生较多。现将两种茶苗根腐病所表现的症状、病原、发病过程、发病条件和防治方法介绍如下。 In the nursery of tea plantations, the phenomenon of dead seedlings is often seen due to the decay of the root of tea seedlings. The reason of dead seedlings: one is caused by the infection of Pythium; the other is due to excessive soil water, tea seedling root suffocation due to long-term flooding and decay. The two root rot occurred in the former more. Now two kinds of tea root rot symptoms, pathogens, pathogenesis, disease conditions and prevention methods are described below.