大蒜叶斑病(CLADOSPORIUM ALLII)的研究 Ⅱ.病菌的越夏及初次侵染来源

本文对我省大蒜叶斑病菌 Cladosporium allii(Ellis.& Martin.)的越夏进行了试验研究,其结果表明:病株种蒜不传病;田间病残体易于腐烂,其上病菌不能越夏;病残体随种蒜把在室内越夏,播种时随种肥进入田间成为当年病害的初次侵染来源。

A STUDY OF GARLIC LEAF BLOTCH(CLADOSPORIUM ALLII)Ⅱ.OVERSUMMERING AND PRIMARY SOURCE OF THE PATHOGEN

In recent years,garlic leaf blotch caused by Cladosporium allii(Ellis & Martin)is prevalent in many garlic growing regions in West Sichuan,China.During 1988-1989, longevity or conidia of fungus stored under different relative humidity conditions was examined.The resuts showed that the remains at rh 100% or immersed in water lived for less than 20 days,below seven months at rh 90%,and over one year at rh 10—75% respectively.The diseased remains oversummering indoor still remained infective.The re- mains bearing pathogen applied in the fields together with barnyard manure could become the primary disease source of this year.It was observed that the severly discased fields in the previous year were not infective.This suggested that the pathogen did not live through the summer in the field.Garlic bulds are not infective too,maybe the fungus could be not car- ried by bulds.