两种肉桂病害病原的形态观察

Morphological Observation of Two Pathogens Associated with Cinnamomum cassia

肉桂是我国重要的药食两用植物,随着种植面积不断扩大,肉桂锈病和白粉病的发生也日趋严重。肉桂锈病主要危害肉桂叶片及嫩梢,感病部位会出现不同程度的凹陷,并产生大量的锈黄色孢子,夏孢子形态为不规则圆形、椭圆形或卵圆形,平均大小为27.1μm×26.6μm,初步鉴定为担子菌门(Basidiomycotina)鞘锈菌属(Coleosporium)真菌。肉桂白粉病主要危害肉桂嫩叶和嫩芽,发病初期,叶片产生水渍状半透明斑点,并逐渐形成圆形白粉层,分生孢子为椭圆形或卵圆形,平均大小为26.7μm×13.7μm,无性态为半知菌类(Fungi Imperfecti)粉孢属(Oidium)真菌。本研究结果将为肉桂锈病和白粉病的鉴定以及综合防控提供理论依据。

Cinnamomum cassia is a vital medicinal and edible plant in China.With the continuous expansion of its planting area,the occurrence of cinnamon rust and powdery mildew is becoming more and more serious.Cinnamon rust mainly affects the leaves and tender shoots,and the infected parts appear to have different degrees of depression and produce many rusty yellow spores.The urediniospores are irregularly round or oval,with an average size of 27.1μm×26.6μm.It was initially identified as Basidiomycotina,Coleosporium.Cinnamon powdery mildew mainly affects tender leaves and buds.In the early stage of the disease,the leaves produce watery translucent spots and gradually form a round powdery-mildew layer.The co-nidia are oval with an average size of 26.7μm×13.7μm.The asexual state was identified as fungi of the Oidium,fungi im-perfecti.The results of this study will provide a theoretical basis for the identification and comprehensive prevention and con-trol of cinnamon rust and powdery mildew.