论文部分内容阅读
自1971年起,每年在浙江各主要棉区的病苗上均分离到红腐病菌(Fusarium spp.)。1978～1982年连续五年,各地病苗红腐病菌平均分离频率根部为24.8～43.5％,子叶上为18.2～37.2％。 接种试验证明,诱致此病的镰刀菌有7种:禾谷镰刀菌(Fusarium graminearum)、串珠镰刀菌(F.mon-iliforme)、茄病镰刀菌(F.solani)、木贼镰刀菌(F.equiseti)、半裸镰刀菌(F.semitectum)、锐顶镰刀菌(F.acuminatum)和三线镰刀菌(F.tricinctum)。一般前4种较常见。 据1982年在海盐县调查,棉苗子叶于5月初开始发病,中旬为发病高峰,下旬停止发生。病情发展与雨日及雨量密切相关,雨日越多和雨量越大,发病越重。 7种杀菌剂对病原菌的生长抑制作用,以多福混合剂与抗菌剂402最显著,其次为多菌灵及托布津,而拌种灵、稻脚青和五氯硝基苯相对较差。 田间防治试验表明,按种子重量1％多福混合剂拌种,并喷浇3000倍抗菌剂402和700倍多福混合剂稀释液共3次,结合增施钾肥,有良好的防效,且能兼治其他苗病。
Since 1971, Fusarium spp. Has been isolated from diseased plants in major cotton areas in Zhejiang every year. From 1978 to 1982 for five consecutive years, the average isolation frequency of red rot pathogen in different places was 24.8-43.5% at root and 18.2-37.2% at cotyledon. Inoculation trials have demonstrated that there are seven Fusarium species that cause this disease: Fusarium graminearum, F. moniliforme, F. solani, equiseti, F. semitectum, F. acuminatum, and F. tricinctum. The first four are more common. According to a survey conducted in Haiyan County in 1982, cotton seedling leaves began to develop in early May, peaked in the middle of the year, and stopped in late. Disease development and rainfall and rainfall are closely related to the more rain and the greater the rainfall, the incidence of heavier. Seven kinds of fungicides on the growth inhibition of pathogens, with the best mixture of antibacterial agents and 402 402, followed by carbendazim and Topaz, and seed dressing Ling, rice stems and pentachloronitrobenzene relatively poor. Field control tests showed that, according to the seed weight of 1%, the mixture of multi-bred seed dressing, and spraying 3000 times antibacterial agent 402 and 700 times more than a mixture of Fufang Diluent 3 times, combined with increased potassium fertilizer, and good control effect Can cure other Miao disease.