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近日,不少菜农打电话反映,很多大葱培土(俗称“扶葱”)后不再生长,叶尖干枯发黄,扒开垄土,发现葱根都烂了。笔者认为这些大葱根部组织腐烂变黑,是大葱染上了根腐病。重茬是造成大葱根腐病的关键因素,由于连续多年种植,土壤中病原菌增多,重茬病害在所难免,极易造成大葱根腐死棵。受前期连续阴雨天气影响,近期土壤湿度过大透气性下降,影响根部正常呼吸,植物自身抗性下降。若此时培土,造成大量伤口,病原菌有机可乘,因而加剧了病害的发生。
Recently, many farmers call to reflect that many green onions earth (commonly known as “Onion ”) no longer grow, leaves withered yellow, stripped open ridge, found that onion root is rotten. I believe that the root of these green onions decay black, green onions infected with root rot. Stubble is caused by the key elements of Onion root rot, due to continuous planting for many years, increased soil pathogens, stubble disease is inevitable, can easily lead to rot on the onion tree. Affected by the continuous rainy weather in the previous period, the recent excessive soil moisture decreases the permeability and affects the normal respiration of the roots and the decline of the plant’s own resistance. If this time earthwork, resulting in a large number of wounds, pathogens take advantage of, thus exacerbating the occurrence of disease.