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慈姑黑粉病俗称泡泡病,是我市慈姑的主要病害。每年梅雨来临时进入发病盛期,使叶片及叶柄提早枯死,一般减产10～15％,严重的达30％以上。 一、发病症状 病菌能侵染叶片、叶柄、花器和球茎,从子叶期至结球期均可发生。病菌侵入叶片后,初期叶片出现褪绿,椭圆形或不规则形边缘不清晰的病斑,正面略突起,叶背面凹陷。以后病斑变灰褐色,表皮破裂露出黑色的孢子层,受风吹雨淋后脱落成孔洞或网状。病斑大小不一,小的1～2毫米,大的10～20毫米,多雨高温天气出现大病斑,天气干旱出现小的褪绿小疱。发病重的叶子整片呈瘤状皱卷,最后枯萎。
Sagittarius powder disease commonly known as bubble disease, is the city’s major diseases Arrowhead. Every year, when the rainy season comes into its peak, the leaves and petioles will die early, generally yielding 10-15% and severely reaching over 30%. First, the symptoms of pathogens can invade the leaves, petioles, flowers and corms, from the cotyledon to the coccyx can occur. Pathogen invades the leaves, the early leaves appear chlorotic, oval or irregular shaped edge of the lesion is not clear positive slightly raised, concave back of the leaves. After the lesion turned gray brown, epidermal rupture of the black spore layer exposed by the wind and rain shedding into holes or reticular. Lesions vary in size, a small 1 to 2 mm, a large 10 to 20 mm, a big spot in the rainy weather, a small meteoric small blisters appeared in the weather drought. The whole leaf of the heavily diseased leaves was nodular and finally wilted.