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(一)、病原菌的鉴定据观察分析,落叶松早期落叶病是一种真菌侵染。被病菌侵染的叶片两面,显出许多黑色小点,为该病菌的无性世代。无性世代形成分生孢子器,黑色,圆形,初埋生于叶表皮下,以后露出表皮,大小为85—90微米。器孢子单孢无色,短杆状,大小为3.4—5.1×0.8—1.0微米,属于 Phyllosticta 型。病原菌的有性世代,形成拟子囊壳,初埋生于越冬病叶的表皮下,吸湿以后孔口稍突出。拟子囊壳黑色,圆形或近圆形,直径为68-119微米,子囊无色透明,棍棒状或
(A), identification of pathogens According to observation and analysis, early larch deciduous disease is a fungal infection. Viburnum infected leaves on both sides, showing many black dots, the bacteria of the clonal generation. Asexual generation of conidia formed, black, round, first born in the leaf epidermis, after exposing the epidermis, the size of 85-90 microns. Spore spore monospora colorless, short rod-shaped, size 3.4-5.1 × 0.8-1.0 microns, belonging to the Phyllosticta type. Pathogenic bacteria of sexual generation, the formation of pseudobulb capsular, initially buried in the epidermis of overwintering disease leaves, moisture absorption slightly prominent after the orifice. Macrocapsular shell black, round or nearly circular, diameter of 68-119 microns, ascus colorless and transparent, stick-shaped or