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近几年来,前季稻在齐穗以后,经常发现在剑叶叶片与叶鞘交界处出现紫褐色病斑,造成剑叶枯死,对产量影响较大.据测定,重病稻株半秕粒增加10.9%,不实粒增加7.2%,千粒重减少10.9%,合计损失23.5%.该病有逐年蔓延扩大的趋势.为了探索剑叶鞘枯病的发生规律和药剂防治的效果,1975年我们进行了病情消长的观察和新农药防病效果的比较.现将试验结果整理如下:一、病情消长观察
In recent years, the first season rice after heading, it is often found in the flag leaf and leaf sheath at the junction purple brown spot, causing the flag leaf withered, a greater impact on the yield.It is determined that severe rice strains increased by 10.9% %, False grain increased by 7.2%, 1000 grain weight decreased by 10.9%, the total loss of 23.5% .This disease has a tendency to spread year by year.To explore the rule of sheath scabbard disease and the effect of chemical control, in 1975 we carried out the disease growth and decline Observation and comparison of new pesticides disease prevention effect now test results are summarized as follows: First, the disease growth observed