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六安地区在水利条件逐年改善的情况下,为了迅速提高粮食产量,去秋各地大力发展绿肥红花草。如六安县秋种红花草四十七万七千亩,比1964年十七万亩,扩大将近三倍。由于各级党委的重视,去秋绿肥种植,抓得早、种得快、管得好。同时,推广了以磷增氮和根瘤菌拌种,生长普遍良好。据六安县11月底检查,全县种植的红花草中,一类苗占30%;二类苗占40%;三类苗只占30%。但是,由于9—11月份,雨天较少,干旱较重,致使红花草普遍发生白粉病,严重地威胁着红花草的正常生长。据我们在六安县卅铺、木厂、潘斯、古城等地调查,发病田块的病情指数一般在40—50%,高者达70%以上,所造成的损失严重者达50%左右。为了制止病害蔓延,保证红花草正常生长,我们对白粉病的发生及其防治进行了初步调查研究,现总结如下,以供参考。
In the context of continuous improvement of water conservancy conditions in Luan area, in order to rapidly increase grain output, we should energetically develop green manicured red flowers and plants in all parts of autumn. Such as Lu’an autumn planted 477,000 acres of red flowers, more than 170000 acres in 1964, expanding nearly three times. Due to the importance of party committees at all levels, autumn green manure planting, grasping early, growing fast, well managed. At the same time, the promotion of phosphorus by nitrogen and rhizobium seed dressing, growth is generally good. According to the check by the end of November in Lu’an County, among the plants planted in the county, 30% of the first seedlings, 40% of the second seedlings and only 30% of the third seedlings. However, due to less rainy days and heavier drought in September-November, powdery mildew generally occurs in safflower, which seriously threatens the normal growth of safflower grass. According to our survey in Lu’an County, Lumberyard, Pans, the ancient city and other places, the incidence index of field plots is generally 40-50% and the highest is over 70%, causing serious losses of about 50%. In order to stop the spread of disease, to ensure the normal growth of safflower, we have carried out a preliminary investigation of the occurrence of powdery mildew and its prevention and control, are summarized below, for reference.