油菜菌核病轻发生条件下的空间分布格局与抽样技术  

Spatial distribution pattern and sampling technique of Sclerotinia stem rot of oilseed rape in low incidence

作　　者：朱金良 陈跃 王光华[2] 王华弟 祝增荣[2] 

机构地区：[1]浙江省嘉兴市植物保护站,浙江嘉兴314050 [2]浙江大学农业与生物技术学院,浙江杭州310058 [3]浙江省植物保护检疫局,浙江杭州310020

出　　处：《浙江农业学报》2012年第3期464-468,共5页Acta Agriculturae Zhejiangensis

基　　金：浙江省重大科技专项(2010C12027)

摘　　要：通过田间调查,应用聚集度指标法、Iwao法和Taylor幂函数法,研究油菜菌核病的田间空间分布格局和抽样技术。结果表明,油菜菌核病空间分布型总体上呈聚集分布,但聚集程度不高,少量田块呈随机、均匀分布。轻发生时油菜菌核病的空间分布型倾向随机和均匀分布。抽样数量随着发病程度的加重而递减,最适理论抽样模型为n2=103.33/m-0.86,在茎株发病率为轻发生的10%时,每田的理论抽样样方数为103,即1 030株。The spatial distribution patterns and sampling technique of oilseed rape stem rot disease in oilseed rape crop Brassica campestris were surveyed and analyzed through index formulae,Taylor and Iwao regression formulations.The results showed that incidence of the stem rot was mainly in aggregation distribution,but the level of aggregation was low,and the spatial distribution patterns belonged to random and uniform distribution in few fields.In the low incidence of the disease,the spatial distribution pattern was inclined to random and uniform pattern.Theoretical sampling size decreased as quantity of infected plants of S.sclerotioum increased.In addition,the optimum theoretical sampling size of the infested rape plants could be obtained from the formula n2=103.33/m-0.86,in which m is the mean number of rot stems in a sampling unit（10 plants in a continuous growing line）.

关 键 词：油菜菌核病 空间分布 聚集度指标法 抽样技术 

分 类 号：S435.654[农业科学—农业昆虫与害虫防治]