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为弄清早稻病草回田与不回田两种处理,对病草中稻瘟病菌存活力的影响,作为闽北地区推广稻草回田可以灭菌防病的科学依据.作者进行了如下观察试验:一、稻草堆表面病草中稻瘟病菌存活的时间一九七四年七月二十六日,选发病不久比较新鲜的病穗,剪取长约2寸左右的病穗颈及主轴,每10～20根用纱线捆成病革束,分别放在田间的草堆表面和实验室内,八月五日取回两束,用清水洗净后置培养皿中,在28℃下保湿培养48小时,镜检病草上孢子产生情况,结果草堆表面和室内病草上的病菌存活率均为100%;九月十七日检查,两处病草上的病菌存
In order to clarify the effect of the two treatments of returning rice to returning rice and returning to the field on the viability of Pyricularia oryzae in diseased grass as a scientific basis for the promotion of rice straw recovery and disease prevention in North Fujian, the author conducted the following observations : First, the surface of the straw heap grass disease Magnaporthe grisea survival time On July 26, 1974, the disease was selected relatively fresh disease spike, cut about 2 inches of disease panicle neck and spindle, each 10 to 20 bundles of diseased strands of yarn were placed in the field haystack surface and laboratory, August 5 to retrieve two beams, washed with water Petri dish, moisturizing at 28 ℃ After 48 hours of cultivation, microscopic examination of spores produced in the grass showed that the survival rates of the pathogenic bacteria on the surface of the haystacks and indoor grass were both 100%. On September 17, the two pathogenic bacteria