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枇杷灰斑病是上海郊区枇杷叶部的主要病害。患病的枇杷树,叶片早期脱落,树势减弱,新梢抽生缓慢。 (一)症状:受害叶片最初是淡灰褐色园形病斑,直径2～4毫米,后变灰白色,多数病斑联接成不规则大型病斑,上面散生黑色的分生孢子盘,叶片焦枯。 (二)病原:灰斑病菌(Pestalozzia funereaDesm)为半知菌类盘多毛孢属。分生孢子盘最初埋生于表皮下,以后突破表皮外露,分生孢子纺梭形,
Loquat gray spot is the main disease of loquat leaves in Shanghai suburbs. The diseased loquat tree leaves early fall off, the shrubs weaken, the new shoots slow. (A) Symptoms: The victim leaves initially pale gray brown park-shaped lesions, diameter 2 ~ 4 mm, after the gray, the majority of lesions linked to irregular large lesions, the above scattered black conidia disk, scorched leaves . (B) pathogen: Cercospora solani (Pestalozzia funereaDesm) for the semi-known bacteria disc discospora. Conidiophore was first buried in the epidermis, then break through the epidermis, conidia spindles,