广西番木瓜炭疽病的病原菌鉴定

Identification of the pathogen of papaya anthracnose in Guangxi

番木瓜(Carica papaya L.)是番木瓜科(Caricaceae)番木瓜属(Carica)植物,在我国种植广泛,具有重要的经济价值。由炭疽菌(Colletotrichum spp.)引起的番木瓜炭疽病,是一种重要的采后病害,严重影响番木瓜果实的品质和产量[1]。2019年3月,在广西南宁西乡塘区的番木瓜种植园观察到具有典型炭疽病症状的成熟番木瓜果实,发病率达到30%。发病初期症状表现为水渍状斑点,逐渐变为深褐色,后期病部凹陷,在潮湿温暖的条件下,病变部位会出现橘红色分生孢子团。

Anthracnose caused by Colletotrichum spp.is an important postharvest disease,which severely affects the quality of papaya fruits.In this study,fungal colonies were isolated and identified from diseased papaya fruits collected from Guangxi Province.Koch′s rule was fulfilled by inoculating three fungal strains,MG2,MG15-4 and MG15-7 on papaya fruits,resulting in the similar symptoms of anthracnose.The strains were identified as C.truncatum based on morphological characteristics and molecular biological identification.This is the first report of C.truncatum caused anthracnose on papaya in China.