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，成为下茬蔬菜的浸染源。因此菜农应在蔬菜生长后期力b强病害防治，直接减少病源基数，并在每茬蔬菜收获后，彻底清除田间残枝败叶，对易患根系病害的蔬菜还要清除茨根。二、深耕。深耕的目的是破坏病菌的生存环境， First, the Qing Park. After a crop of vegetables harvest, many bacteria attached to the vegetable residue scattered on the field, become the next source of vegetable contamination. Therefore, vegetable growers should be late in the growth of vegetables b strong disease prevention and control, direct reduction of the base of the source, and in each crop of vegetables, the complete elimination of the leaves of broken branches in the field, but also easy to get rid of root vegetables root vegetables Roots. Second, deep plowing. The purpose of deep plowing is to destroy the living environment of germs,