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作物生产中,为防止种子传染或土壤传染微生物引致的病害,通常用杀菌剂处理种子.虽然已登记了几种种子处理杀菌剂,但由于生产技术的改变,病虫害种群的动态变化以及在研究病原菌生物学方面的新发现,还需要继续研究和改进病害防治策略.在美国,随着更多地采用高产的集约管理措施,可望能改进小谷粒作物种子处理杀菌剂.这种管理措施的核心,包括增施氮肥和加大植株密度,而这二者都可使几种重要病害的加剧.在生长中期到后期施用叶部杀菌剂能有效防治这些病害,但由于增加了开支,使中后
In crop production, seeds are usually treated with biocides to prevent disease caused by seed or soil-borne microorganisms.Although several seed treatment fungicides have been registered, due to changes in production techniques, dynamic changes in the population of pests and diseases, New discoveries in biology also require continued research and improvement of disease control strategies.With more intensive and intensive management measures in the United States, it is expected that small-grain crop seed treatment fungicides will be expected to improve. The core of this management approach , Including the application of nitrogen fertilizer and increased plant density, both of which can exacerbate several important diseases. The application of foliar fungicides during the middle and late stages of development is effective in controlling these diseases but, due to increased expenses,