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一、甘草根腐病1.症状。甘草根腐病主要危害根和根颈部,受害后地上部茎叶逐渐黄枯,根茎部成黄褐色至黑褐色凹陷溃烂。2.发生规律。该病是一种真菌性病害,病原菌为几种镰刀菌。病菌是土壤习居菌,在土壤中长期腐生,病菌借水流、耕作传播,通过根部伤口或直接从叉根分枝裂缝及老化幼苗茎基部裂口处侵入。地下害虫、线虫为害造成伤虫口利于病菌侵入。管理粗放、通风不良、湿气滞留地块易发病。
First, licorice root rot 1. Symptoms. Licorice root rot is the main root and root damage to the roots, roots and leaves of the ground after the disease gradually yellow dry, rhizome into a brown to dark brown depression fester. 2. The law occurs. The disease is a fungal disease, the pathogen is several Fusarium. Bacteria are soil habitat, long-term saprophytic soil in the soil, bacteria by water flow, tillage spread through the root wound or directly from the root of the root fissures and stems of seedlings broke into the incision. Underground pests, nematodes damage caused by harmful insects mouth beneficial bacteria invade. Extensive management, poor ventilation, moisture retention plots susceptible to disease.