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杜松赤枯病是 4年生以上杜松幼树的主要病害 ,在我省为害严重。研究表明 ,此病是由Alternariasp .和Phomasp .共同侵染所致。Alternariasp .以菌丝体和分生孢子越冬 ,Phomasp .以菌丝体和分生孢子器越冬。两种病原菌均通过皮孔、气孔和伤口侵入树体。两种病原菌的孢子均在5月下旬日平均气温达 16℃左右时开始放散 ,孢子的放散和萌发与空气温度的关系最为密切 ,雨季是孢子放散的高峰期。通过对 12种杀菌剂的室内药效测定 ,以及四种杀菌剂的室外防治试验 ,得出用 4 0 0～ 80 0倍液的多菌灵等连续防治 2～ 3年 ,可完全控制该病的发生和蔓延 ,防治方法简便易行 ,成本低廉 ,功省效宏
Juniper berry blight is the main disease of juniper saplings over 4 years old, which is serious in our province. Studies have shown that the disease is caused by the co-infection of Alternariasp. And Phomasp. Alternariasp. Overwintering with mycelia and conidia, Phomap., Wintering with mycelium and conidia. Both pathogens invaded the tree through lenticels, stomata and wounds. The spores of the two pathogenic bacteria began to release when the average daily temperature of about 16 ℃ reached about 16 ℃ in late May. The spore release and germination had the closest relationship with air temperature, and the rainy season was the peak of spore release. Through the determination of indoor efficacy of 12 kinds of bactericides and the outdoor control of 4 kinds of bactericides, it was concluded that carbendazim of 4 0 0 to 80 0 times could be continuously controlled for 2 to 3 years to completely control the disease The occurrence and spread of the prevention and control methods is simple, low cost, energy-saving effect macro