春甘蓝育苗期为啥感黑根症

• 作 者: 程鹰
• 机 构: 山西省农科院蔬菜所 030031
• 出 处: 山西农业
• 发表日期: 1997年12期
• 关键词: 适温范围 春甘蓝 育苗期 真菌侵染 病原真菌 苗床 幼苗叶片 病原菌 根茎部 缢缩

一、为啥出现黑根症状 该症状由真菌侵染引起,病原菌是立枯丝核菌,主要在土壤内越冬,其生长适温范围为20～30℃。在育苗时,使用了带菌的床土或没有完全腐熟的带菌肥料,幼苗出土后,苗床内温度及湿度偏高时,病原真菌易从幼苗根茎部侵入,使发病部位变黑、缢缩,重者可使幼苗叶片干枯、死亡。

First, why black root symptoms Symptoms caused by fungal infections, Rhizoctonia Rhizoctonia pathogen is the main winter in the soil, its growth temperature range of 20 ~ 30 ℃. In the nursery, the use of the bed with soil or not completely decomposed with fungal fertilizers, seedlings unearthed, the seedbed temperature and humidity is high, the pathogenic fungi invade easily from the root and shoot of seedlings, so that the incidence of black spots, shrinkage, weight Seedlings can make the leaves dry and die.