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一、重迎茬对大白菜繁种产量质量的影响。 1.易感霜霉病、软腐病。据调查,1991年七台河市种子公司在山东省昌邑县宋庄乡辛城村繁育80亩牡丹江一号大白菜种子,由于该村连年大白菜繁种,大白菜的霜霉病发病率超过50％,软腐病也达到30％,大白菜种子结实率和质量严重下降,导致大白菜种子产量平均亩产58公斤,比正常每亩减产42公斤,总减产3360公斤,直接经济损失1.3万多元。
First, heavy-cropping on the quality of Chinese cabbage production and breeding. 1. Downy mildew, soft rot. According to the survey, in 1991, Qichuanhe Seed Company bred 80 mu of Mudanjiang No. 1 Chinese cabbage seed in Xincheng Village, Songzhuang Township, Changyi County, Shandong Province. Due to the successive breeding of Chinese cabbage in this village, the incidence of downy mildew in Chinese cabbage exceeded 50%, soft rot also reached 30%, Chinese cabbage seed setting rate and serious decline in quality, leading to the average yield of Chinese cabbage per kilogram 58 kg, 42 kg less than the normal per mu, a total reduction of 3360 kg, the direct economic loss of 13,000 Multiple.