Distribution of Rapeseed Clubroot Disease in Hubei Province and Evaluation of Yield Loss

油菜根肿病在湖北省的发生分布及其引起的油菜产量损失评估(英文)

[Objective] The aim of this study was to reveal the distribution of rapeseed clubfoot disease in Hubei Province and to assess the yield loss caused by the pathogen, Plasmodiophora brassicae. [Method] Field surveys were conducted in Shayang, Dangyang, Zhijiang, Yidu and Changyang of Hubei Province during 2009- 2011. Clubfoot disease of rapeseed samples from the surveyed locations were con- firmed by PCR detection and plants infection experiment. The factors of yield and plot yields influenced by clubroot disease were determined in plot experiment. [Re- salt] Rapeseed clubroots were confirmed in Zhijiang and Dangyang and not found in Shayang and Yidu. Clubroot was found in cruciferous vegetables but not in rapeseed d in Changyang. Infection of P. brassicae significantly decreased of the first effective branch numbers of rapeseed, effective pod number per plant, seed number per pod and 1 000-grain weight. Yield of infected rapeseed decreased by 56.4% over non-infected control. [Conclusion] Rapeseed clubroot disease mainly distributed in Zhijiang and Dangyang of Hubei Province. The disease had an economic impact on rapeseed production.

[目的]明确油菜根肿病在湖北省的发生范围和病害引起的油菜产量损失。[方法]2009-2011年间取样调查了我省沙洋县、当阳市、枝江市、宜都市和长阳县的根肿病的发生情况,通过盆栽接种试验和PCR分子检测确定根肿病。测量病区油菜根肿病的发病率,产量组成因子和小区产量,与健康区比较,评估根肿病引起的油菜产量损失。[结果]在枝江市和当阳市发现并确诊了油菜根肿病,沙洋和宜都没有发现油菜根肿病,而长阳县的根肿病主要发生在十字花科蔬菜上。发生根肿病后,油菜植株的一次有效分枝数、单株有效角果数、每角粒数和千粒重显著下降,产量损失达56.4%。[结论]湖北省油菜根肿病主要分布于枝江市和当阳市。病害的发生对油菜生长和产量造成较大影响。