白头翁锈病近程传播及空间分布型研究

Study on Short Distance Spread and Space Distribution of Windflower Rust

白头翁锈病是近年来我国新报道发生的一种病害,在辽宁省保护地白头翁生产中,病害尤为严重。根据植物病害流行学原理和研究方法,对沈阳地区白头翁锈病菌近程传播及空间分布进行了研究。对调查数据进行回归分析,结果表明:指数模型是沈阳地区白头翁锈病近程传播中的最佳模型,顺风传播梯度可用y=570.63e-0.005 5x描述,侧风向传播梯度可用y=1 004.9e-0.011 6x描述(y为锈病的发病程度,x为距菌源中心的距离)。在全田普遍发病的条件下,白头翁锈病在1个月内顺风向传播距离约为100 m;侧风向传播距离约为55 m。白头翁锈病病株空间分布型在病害发生前期和中期为聚集分布,后期为均匀分布。

Windflower rust is a newly discovered disease in China,which is very serious in the protected field of windflower.Spores flying,disease gradient and space distribution of windflower rust were studied.Regression analysis was used to analyze the surveyed data.The results show that exponential model was the optimum one for the short distance spread of windflower rust in Shenyang region.The regressive equation of downwind to spread was y=570.63e-0.005 5x and the regressive equation of crosswind was y=1 004.9e-0.011 6x.When the disease came on in the entire field,the distance of disease spread downwind was about 100 metres,but 50 metres crosswind in a month.Spatial distribution pattern of the disease was gathered at the beginning and middle stages,evenness at the later stage.