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稻瘟病是我县水稻主要病害之一。近年来,由于长期栽插同一抗源的品种,导致稻瘟病菌种群发生变化,由弱势种群成为致病力强的优势种群,菌量大增,危害加重。加之,水稻易感病的生育期间雨日多,日照少,湿度大,适宜病菌的繁殖和侵染,种子、稻草带菌量大,消毒处理不严,密播密植,施氮肥数量增多,管水不当,药剂防效差,因此,导致部分地区病害流行成片。 1984年我们在海拔950米重病区的石人乡开展了稻瘟病综合
Rice blast is one of the major diseases of rice in our county. In recent years, due to long-term planting the same variety of anti-source, resulting in changes in the population of Magnaporthe grisea, from the vulnerable population to become the dominant species of strong pathogenic bacteria, the amount of bacteria increased, the harm worse. In addition, the susceptible disease of rice during the rainy days more, less sunshine, humidity, suitable for the breeding and infection of germs, seeds, straw with a large amount of disinfection lax, close planting dense, increasing the number of nitrogen fertilizer, water pipe Improper drug poor efficacy, therefore, leading to epidemic of disease in some areas into pieces. In 1984, we carried out rice blast synthesis at Shiren Township, 950 meters above sea level