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一、宁夏稻瘟病历年发生和防治情况稻瘟病是宁夏水稻生产上的主要病害。据资料记载,从1953～1965年和1972～1973年共十五年间,因稻瘟病为害损失稻谷1～3成的有十年。在1957年进行大面积防治之前,全区水稻单产基本上是随稻瘟病的轻重而增减。1954年病害比1953年重,水稻亩产比1953年减少18斤。1956年病害最重,水稻亩产比1955年下降125斤。由于稻瘟病为害严重,从1953年起开始用赛力散等农药防治;1960、1961年分别用飞机防治21万亩和19万亩;1964年防治面积达30万亩,占稻田面积的30％以上。据1957～1964年灌区52个使用赛力散、西力生、稻瘟散等药剂防治试验的实打产量对比结果,除3个因倒伏等其它因素影响,表现不增产外,其
First, the occurrence and control of rice blast in Ningxia in recent years Rice blast is the main disease in rice production in Ningxia. According to the records, from 1953 to 1965 and from 1972 to 1973, a total of 15 years, rice blast damage due to rice 1 to 3 percent for ten years. Before large-scale prevention and control were carried out in 1957, the rice yield in the entire region basically increased or decreased with the severity of the rice blast. The disease was heavier in 1954 than in 1953, and the per-mu yield of rice was reduced by 18 pounds compared with 1953. The disease was the heaviest in 1956, with a drop of 125 kg per mu in 1955. Due to the severe damage of rice blast, we started to control the pesticides such as Sai Li San since 1953. The control of 21 million mu and 19 million mu respectively by airplanes in 1960 and 1961; the control of 30 million mu in 1964, accounting for 30% the above. According to the results of comparison of the actual production of 52 pesticides using Saili Powder, Xi Lisheng, and Magnosine Powder in the irrigation areas from 1957 to 1964, except for the three effects of no yield increase due to other factors such as lodging,