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近年杜鹃瘿瘤病在重庆南山风景区杜鹃苗圃发生,春鹃发病率达44％。嫩枝、梢和叶片等幼嫩部分受害。病叶边缘或全叶肿大肥厚,呈瘤状或半球状肉质菌瘿;受害枝梢也肿大增粗成肉质,影响抽梢。少数花瓣受害增厚变硬呈肉质或蜡质瘤,严重的不能开花。湿度大时瘿瘤表面或凹陷处长出白色粉状霉层即病菌的子实层,最后菌瘿变褐枯萎脱落。 一、病原 采集表面生有灰白色霉层的新鲜菌瘿,徒手切片染色镜检,证实该病由半球外担菌 (Exobasidium hemisphaericum)所致。子实层生于瘿瘤表面,呈白色至灰白色粉状霉层。担子平行排列,簇生成层。初期生于寄主表皮下,后突破外露,大小30.0-55.0×5.0—6.5微米,担子顶端生有4个尖削的
In recent years, cuckoo gall disease in Chongqing Nanshan Scenic Area rhododendron nursery occurred, the incidence of spring cuckoo reached 44%. Shoots, shoots and leaves and other young parts of victims. Sick leaves edge or full-leaf hypertrophy, was tumorous or hemispherical succulent 瘿; victim branches also enlarged thickening into flesh, affecting the tip. A small number of petals thicken hard hardened to succulent or waxy tumor, serious can not flowering. Humidity when the tumor surface or depression grow white powdery mildew layer that is the sub-layer of bacteria, the last browning brown withered off. First, the pathogen collection of gray moldy surface of the fresh mold 瘿, bare hands stained microscopy confirmed that the disease caused by the Exobasidium hemisphaericum (Exobasidium hemisphaericum). Stratum was born in the tumor surface, white to gray powdery mildew. Basically parallel to the burden, cluster generation layer. Initially born under the host epidermis, after breaking through the exposed size of 30.0-55.0 × 5.0-6.5 microns, born on the top of the burden of 4 sharp cut