大连市天竺葵叶斑病病情调查及病原菌鉴定初报

Preliminary Report on the Investigation and Identification of Geranium Leaf Spot Pathogens

天竺葵(Pelargonium hortorum)具有较高的观赏价值和药用价值,是城市园林中常见的草本花卉。近几年,大连市园林中的天竺葵叶斑病发生较重,查明病因、为病害防治提供理论依据尤为重要。采用单斑分离、致病性检测、形态学及分子生物学鉴定,查明了大连市天竺葵叶斑病的病原是两种真菌:枝顶孢属的点枝顶孢(Acremonium alternatum)和链格孢属的致密链格孢(Alternaria compacta)。点枝顶孢侵染天竺葵,导致其发生叶斑病鲜有报道。

Geranium（ Pelargonium hortorum） is a common herbaceous flower in urban landscape with a high ornamental and medicinal value. In recent years,serious leaf spot appears in Geranium of Dalian. Therefore,it is imperative to find out the pathogenesis and provide theoretical basis for the disease prevention. To identify the pathogens of the leaf spot of Geranium,several methods were used such as isolation pathogens from the leaf spot sample,pathogenicity determination of the isolated strain,morphological and molecular biological evaluation,etc. The results show that Acremonium alternatum and Alternaria compacta are two kinds of pathogens that lead to the Geranium leaf spot in Dalian. So far,Acremonium alternatum of the Geranium leaf disease is rarely reported.