云南蚕豆枯萎病流行的时间动态规律研究

 1997～1999年研究结果表明:云南省蚕豆枯萎病从秋苗即开始发病,有苗期和成株期两个发病高峰期,流行曲线呈双峰型曲线。第１个发病高峰期,从10月5日～12月5日,持续约55～60 d,有明显的指数增长期、逻辑斯蒂增长期和衰退期。第2个发病高峰期,从2月5日～15日开始,到蚕豆收获,持续约45～55 d,该期没有明显的指数增长期和衰退期。影响流行时间动态的主要因素有:蚕豆遭受冻害的时间与程度、土壤含水量的变化、土壤类型、耕作制度和栽培措施等。

Investigation on Fusarium spp. Spreading and Harm in Main Vicia faba Cultured Area in Yunnan

There are 15 families,36 genura and 130 species of Agricultural Foresty acarus In Yunnan province,among of them there are 8 families,13 genura and 58 species of predatory acarus.Accoring to the species and the geographical distribution of the Agricultural acarus of Yunnan province,there are 7 regions on the plane figure,they are: 1. Central Yunnan Plateau Region; 2. West Yunnan Basin Region; 3. Southeast Yunnan Karst Region; 4. Southwest Yunnan Wide Va1ley Region; 5. Southern Border Region; 6. Northeast Yunnan mountainous Plateau Region;7. Northwest Yunnan Plateau Valley Region. The Regions and Strata not only represent the different elevation,climate,the system of cultivation and the characteristics of the Agricultural acarid's distributional region but also represent many local acarus to show the character of its region.