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在大葱种植过程中,经常出现烂根现象,这是造成大葱减产的一个重要原因。大葱烂根的原因是多方面的,但主要是由根腐病、软腐病、根蛆危害、积水沤根这四方面引起的,应根据实际情况,对症防治。一、根腐病引起的烂根根腐病是一种真菌性病害,土壤和种子均可带菌。重茬是造成大葱根腐病的关键因素,高温多雨是根腐病发生和蔓延的有利条件。1、症状大葱根腐病主要危害幼苗,成株期也能发病。发病初期,仅个别支根和须根感病,后逐渐向
In the process of planting green onions, rotten roots often appear, which is caused by the reduction of green onions is an important reason. The root causes of green onions are many, but mainly caused by root rot, soft rot, root maggots, and stagnant water. These four aspects should be based on the actual conditions and should be used for symptomatic prevention and treatment. First, rot caused by root rot Root rot is a fungal disease, soil and seeds can be carried. Continuous cropping is the key factor that causes the root rot of Onion, hot and rainy is the favorable conditions for root rot occurrence and spread. 1, the symptoms of Onion root rot the main damage seedlings, adult stage can also disease. Early onset, only a few root and fibrous root disease, and gradually to