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越冬菌源和虫源,是翌年病虫发生的重要条件。在虫病大发生的当年冬季,采取有效措施,减轻越冬病虫基数,特别显得重要。据多年的生产实践和试验证明,做好如下三项工作对减少来年病虫发生有显著效果。 一、处理病草、病谷 据测定,稻瘟病病菌,在草堆内干燥病草中的菌丝,经一年尚有百分之六十存活,埋入土下或浸入水中稻草上的菌丝,经一个月就全部死亡;病草作堆肥经十天充分发酵,温度达二十五至二十六度,病菌可全部死亡;病草垫猪圈,经二十七天后也可死亡;病谷上的病菌至翌年七月下旬开始死亡。一九八五年是稻瘟病重发年份,收割时发病田块的病草、病谷最好另行堆放,病草先用,病谷先吃,晒场残屑和有病秕谷要及时处理,杜绝病菌越冬。病草不可用于搭棚、盖屋;不可用于催芽、捆札秧把,病谷不可作种。
Overwintering sources of bacteria and insects, is an important condition for the occurrence of pests and diseases the following year. It is particularly important to adopt effective measures to reduce the number of overwintering pests and diseases in the winter of the year when the disease occurs. According to many years of production practices and tests show that doing the following three tasks to reduce the occurrence of pests and diseases the following year have a significant effect. First, the treatment of sick grass, disease Valley According to the determination of rice blast bacteria, dry grass in the Haystack mycelium, after a year there is still 60% of the survival, buried in soil or submerged straw in the water mycelium , All died within a month; sick grass compost ten days after fermentation, temperature of twenty-five to twenty-six degrees, the bacteria can all be killed; sick pad pad, after twenty-seven days can also be killed; Pathogenic bacteria on the valley to the end of July next year began to die. 1985 is the year of rice blast disease re-emergence, the disease at the time of harvest piece of grass, diseased valley is best stacked separately, sick grass first use, diseased valley first to eat, the sun field debris and diseased Valley to be promptly processed , To prevent bacteria overwintering. Diseased grass can not be used for scaffolding, cover the house; can not be used to promote budding, tied saplings, sick valley can not be used as seed.