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红花酢浆草叶斑病病原菌生物学特性研究
引用本文:纪瑛,肖崇刚.红花酢浆草叶斑病病原菌生物学特性研究[J].植物保护,2006,32(5):65-68.
作者姓名:纪瑛  肖崇刚
作者单位:西南大学植物保护学院,重庆,400716
摘    要:引起红花酢浆草叶斑病的假尾孢属真菌红花酢浆草假尾孢(Pseudocercospora oxalidis Goh&;Hsieh)适合生长的培养基有红花酢浆草叶片煎汁+葡萄糖20 g、V8汁和Richard培养基。pH3~12适合菌落生长,最适宜pH4~6,适宜温度为20~25℃。病原菌对麦芽糖、葡萄糖、蔗糖、乳糖和对牛肉膏的利用好于其他碳源或氮源。分生孢子萌发的温度为20~25℃,pH4~6,分生孢子萌发的相对湿度为98%~100%,营养对孢子萌发有促进作用。

关 键 词:红花酢浆草  叶斑病  生物学特性
收稿时间:2006-01-20
修稿时间:2006-01-20

Biological characteristics of Pseudocercospora oxalidis
Ji Ying;Xiao Chonggang.Biological characteristics of Pseudocercospora oxalidis[J].Plant Protection,2006,32(5):65-68.
Authors:Ji Ying;Xiao Chonggang
Institution:College of Plant Protection, Southwest University, Chongqing 400716, China
Abstract:In recent years,Oxalis corymbosa DC.has become more prevalent in the dry farms in Guizhou.Moreover,it has become a kind of virulent weed in lawn and in garden plots of southern China.This study aimed to use its pathogenic fungus Pseudocercospora oxalidis Goh &; Hsieh to control the weed.The biological characteristics of the pathogen were investigated.The most optimum medium for the growth of P.oxalidis was leaf decocts of O.corymbosa plus sugar.V8 juice agar and Richard's medium were also propitious to the pathogenic fungus.For the growth of the pathogen,the favorable pH fell within 3-12 with pH 4-6 as the optimum,and the favorable temperature was between 20-25 ℃,with the same for conidial germination.Among the carbon and nitrogen resources tested,maltose,glucose,sucrose,lactose and beef extract were better.A comparatively high humidity was required for conidial germination.Nutritional doses had selective effects on conidial germination.
Keywords:Oxalis corymbosa  leaf spot  biological characteristics
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