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棉花铃疫病是我省棉花生产上重要病害之一。一般干旱年份发生较轻,烂铃率为0.7～8.19%;秋季多雨年份或覆盖地膜棉田发病重,烂铃率可高达30%以上。受害轻的棉铃形成僵瓣花,严重时全铃腐烂。为此,我们从1980年开始筛选药剂,进行防治研究,经三年田间试验和较大面积生产田应用,证明代森锰锌防效较好,现将研究结果初报于下。一、供试材料和方法1.试验材料:药剂为进口的代森锰锌,代号是 M45;70%代森锌可湿性粉剂为苏家屯农药厂产品。棉花品种三年试验均选用黑山棉一号。2.试验方法:(1)1980年采取大区对比法,10米行长,4行区,行距57厘米,小区面积为22.8平方米,进行药剂筛选;1981和1982年均采取随机排列法,5米行长,6行区,行距57厘米,小区面积为17.1平方米,三次重复。(2)喷药与发病调查:8月5日开始
Cotton bollworm is one of the most important diseases in cotton production in our province. In the dry years, the incidence of rotten bolls was 0.7 ~ 8.19%. In rainy autumn or covered with mulched cotton fields, the incidence of rotten bolls was very high, and the boll rate was as high as 30%. Injured light cotton boll formation petals, severe full-bell decay. To this end, we started screening drugs in 1980 to carry out prevention and treatment studies, after three years of field trials and large-scale production of field applications to prove that mancozeb better control effect, the results of the study reported below. First, the test materials and methods 1. Test Materials: Pharmacy for the import of mancozeb, code-named M45; 70% Mori Zinc WP for the Sujiatun pesticide plant products. Three-year cotton varieties were selected Montenegro cotton one. 2. Test methods: (1) In 1980, the method of large area comparison was adopted, with the length of 10 meters, the length of 4 rows, the distance of 57 cm and the plot area of 22.8 square meters. Pharmacy screening was conducted in 1981 and 1982, 5 meters president, 6 lines, spacing 57 cm, plot area of 17.1 square meters, three times repeated. (2) spraying and disease investigation: August 5 start