山东省掖县,近几年来甘藷普遍遭受黑斑病传染,无论苗期、大田期、贮藏期为害都极严重,尤以习惯室内、外温床育苗栽植的山丘地区为甚,它给予国家粮食生产和农民生活上的损失至为巨大。但是劳动农民在长期的劳动生产过程中创造出“大田育苗”法(当地叫做栽母瓜)不仅获得防止黑斑病传染,同时利用种藷再增产。如第九区上庄乡互助组长张德 In Yexian County, Shandong Province, in recent years, sweet potato is commonly infected with black spot disease. It is very serious in the seedling stage, field stage and storage period. Especially in the hilly area planted with nursery beds, it gives the national food production And farmer’s loss of life is huge. However, in the long process of labor production, laborers have created a “field nursery” law (locally called planting mother melon) not only to prevent the spread of black spot disease, but also to increase seed production. Such as the ninth district Zhuang Xiang mutual leader Zhang De