棉花黑果病菌的越冬和药剂抑菌试验

棉花黑果病菌（ＤｉｐｌｏｄｉａｇｏｓｙｐｉｎａＣｏｏｋｅ）分生孢子和菌丝均可在病铃上越冬。放置室外的病铃分生孢子存活率较低；１９９８年３、４、５月检查分别为１２．５％、３．８％和１．２％。５月份检查，室外病铃菌丝存活率可达３０％。病菌孢子和菌丝在室内的存活率均比室外高。恶霜灵锰锌５００倍液对棉黑果病菌孢子和菌丝的抑制率分别达７７．３％和９０．８％。

Isolation and Identification of Black Spot Pathogen in Psidium guajava

[Objective]The aim was to isolate and identify the pathogen causing black spot disease in guava（Psidium guajava）,so as to determine its taxonomic status.[Method]The fungus was identified by determining its pathogenicity,observing its morphology characteristics and analyzing its ITS sequence.[Result]The pathogen causing black spot disease in guava was a strain of Guignardia mangiferae.[Conclusion]This study will provide theoretical basis for curing black spot disease of guava.