一、清园。一茬蔬菜收获后,很多病菌附在蔬菜残枝上散落田间,它进入土壤中,成为下茬蔬菜的侵染源。因此,菜农应在蔬菜生长后期加强病害防治,直接减少病源基数,并且在每茬蔬菜收获后,彻底清除田间残枝败叶,对易感根系病害的蔬菜还要清除残根。 First, the Qing Park. After a crop of vegetables harvest, many bacteria attached to the branches of vegetables scattered on the field, it enters the soil, become the next source of vegetable infection. Therefore, vegetable growers should strengthen the disease prevention and control in the late growth of vegetables, directly reduce the base number of the disease, and in each crop of vegetables, the complete elimination of the leaves of broken branches in the field, the roots of susceptible vegetables but also remove residual roots.