十字花科蔬菜根瘤病

Clubroot of cruciferous vegetables

本病害為歷史悠久的十字花科蔬菜根部病害，最早紀錄出現在13世紀的歐洲，其病原菌直到1878年才由俄羅斯學者Woronin氏正式鑑定並命名。台灣於1933年由日本學者澤田氏首次報導本病發生於桃園、新竹一帶的芥菜田，1986年本病主要發生區域集中於桃園、新竹、梨山及宜蘭等地區，尤其高山夏季蔬菜區發病相當嚴重。隨後筆者曾於2013年在台南市將軍區及2014年在嘉義縣瑞峰風景區分別發現油菜及多種十字花科蔬菜遭受本病之為害，造成收成欠佳。

"Clubroot of cruciferous vegetables is caused by the obligate parasite Plasmodiophora brassicae resulting in yield losses in Taiwan. This article discusses clubroot symptoms, the causal pathogen, diagnosis, and management strategies. An increase of soil pH by adding S-H mixture, mineral ash, or calcium carbonate could reduce the clubroot incidence. Soil application of lime mixed with shrimp and crab shell powder or chitosan also could effectively suppress the disease. Recent studies have identified a Bacillus mycoides strain that could effectively reduce clubroot incidence when applied 7 days before or after planting."