A Comparative Study of the Occurance and Patholigical Observation of the Poplar Rust and Willow Rust in Northeast Sichuan
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摘要: 杨树和柳树均属于杨柳科植物，两者在经济林及绿化行道树上的运用越来越广泛。锈病在杨树和柳树高栽植密度苗圃地和成片用材林的发生极为严重。本研究比较杨树和柳树锈病的发病症状、流行特点及病原菌特征，为该病的防治提供理论和实际指导依据。以川东北地区4区（县）（南充市高坪区和西充县，广安市前锋区和武胜县）患发锈病的杨树和柳树为研究对象，采用流行病学调查和显微观察技术等方法。杨树锈病和柳树锈病大都侵害叶和幼苗，引起树叶早期脱落，幼苗枯萎。但杨树锈病的病原菌为锈菌科栅锈菌属松杨栅锈菌（Melampsora larici-populins），柳树锈病的病原菌为锈菌科栅锈菌属拟鞘锈栅锈菌（Melampsora coleosporioides Diet.）。杨树锈病和柳树锈病虽有共同的发病特征，但在为害症状、病原类型和发生规律方面均有很大的不同。建议在防治时根据寄主的不同选择针对性强的防治方法。Abstract: Poplar and willow belong to salicaceae plants,both of them were widely used in economic forest,urban afforestation and roadside.Rust was one of the serious diseases that harmed the salicaceae plants,especially in high density planting nursery and pieces of timber forests. The aims of this study was to compare the differences of symptoms,epidemic characteristics and pathological characteristics between the poplar rust and willow rust,and to provide a theoretical and practical guidance for the prevention and treatment of the disease. The field study was carried out in Northeastern Sichuan (including Gaoping district and Xichong county of Nanchong,Qianfeng district and Wusheng country of Guang'an).Epidemiological investigation and microscopic observation technology were adopted in this study.Most of the pathogenic bacteria affected the leaves and seedlings of the poplar and willow,caused leaves to fall off early and the seedlings to wither. But the pathogenic bacteria was Melampsora larici populina (Melampsora larici-populins) for poplar rust; for willow rust,it was Melampsora larici the Hemicriconemoides (Melampsora coleosporioides Diet.).Though there were several same characters between the poplar and willow rust,they were different in the aspects of the symptoms,pathogenic types and occurrence regularity of the disease.It is advised that pertinent prevention and treatment should be chosen according to the different hosts.
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Key words:
- Rusts;
- Poplar;
- Willow;
- Infestation situation;
- Pathogen characteristics
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