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南充地区1988年玉米粗缩病大发生,发病面积16万亩,占全地区玉米种植面积的8.3％,重病地病株率达70％,因病翻耕改种2290亩,损失产量430多万公斤。1989—1991年,我们对仪陇、阆中、南部、南充县、广安等发病和未发病县市的生态因素进行了大量调查研究,初步认为:播种到幼苗(5叶前)期间,降水量对玉米粗缩病的发生轻重影响很大,前作、品种、草柴坡、播栽方式、土质、施肥水平等都有较大的影响。摸清这些规律,对玉米粗缩病的预测预报和防治工作有一定的价值。一、4月分降水量与玉米粗缩病发生的关系我们选择这几年发病较重的仪陇县、南部县、阆
Large area of maize disease occurred in 1988 in Nanchong, covering an area of 160,000 mu, accounting for 8.3% of the total area planted with maize in the whole region. The rate of diseased plants was 70%, 2290 mu kg. In 1989-1991, we conducted a lot of investigation and study on the ecological factors in the counties of Yilong, Langzhong, Nanchong, Nanchong, Guang’an, etc. It is preliminarily believed that during the sowing to seedling The occurrence of maize rough has a great impact on severity, pre-make, breed, Caoshiaoban, sowing methods, soil quality, fertilization levels have a greater impact. To find out these rules, it has certain value to the prediction and control of maize rough-sicken. First, the monthly precipitation in April and the occurrence of corn rough contractions We choose the incidence of heavier in recent years Yilong County, Southern County, 阆