Resistance evaluation of different plum varieties to anthracnose
Plum anthracnose caused by Colletotrichum Corda is one of the most important diseases of plum trees,which seriously affects the growth and production of plum.Screening of resistant plum varieties is the most effective method to control the disease.To find an inoculation method for accurate evaluation of plum resistance to anthracnose,we inoculated plum variety"Fortune"with 8 different methods,including inoculation of woun-ded or unwounded leaves(detached leaves or leaves of living plants)with spore suspension or mycelial plugs of Colletotrichum fructicola.The result revealed that disease incidence for inoculation of wounded leaves reached 100％.Disease severity for inoculation of both detached leaves and leaves of living plants were similar,with de-tached leaves showing additional rot symptom.In conclusion,inoculation of wounded leaves of living plants with spore suspension of the pathogen led to a better evaluation of plum resistance to anthracnose.Resistance evalua-tion of 40 plum varieties to anthracnose by this method showed five resistance types:immune,highly resistant,moderately resistant,moderately susceptible and highly susceptible.Among the tested 40 plum varieties,11,11,12 and 6 were highly resistant,moderately resistant,moderately susceptible and highly susceptible,respectively,and no immune varieties were found.This study for the first time evaluates the resistance of different plum varie-ties to anthracnose.The results lay a basis for further research on screening and breeding of anthracnose-resistant plum varieties.
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