论文部分内容阅读
甜菜霜霉病菌以卵孢子在病种子和病残体上越冬，也可以卵孢子或菌丝在窖藏母根上越冬，翌年卵孢子萌发或母根中菌丝生长产生孢子囊作为初侵染源。该菌远距离传播主要靠带菌种子或母根。潮湿冷凉环境下易发生甜菜霜霉病，过量施用氮肥，栽培密度过大，造成田间郁蔽有利病害发生。应用７５％百菌清可湿性粉剂、５８％甲霜灵锰锌和４０％增效瑞毒霉粉剂，采用叶面喷雾或喷雾与拌种相结合对该病均有较好防效。
The beetle downy mildew in oyster spores overwintering on the sick seeds and disease residues can also oospores or hyphae overwinter in the cellar parent, the following year ovule germination or mycelial growth mycelium spores as a primary source of infection. The long-distance transmission of the bacteria rely mainly on contaminated seeds or mother roots. It is easy for sugarbeet downy mildew under humid and cool environment, excessive application of nitrogen fertilizer and overgrowth of planting density, resulting in the formation of favorable and disease-causing diseases in the field. The application of 75% Chlorothalonil WP, Metamaxyl 58% Methotrepirone and 40% synergistic reed mildew powder, the use of foliar spray or spray and seed dressing combination of the disease have a good control effect.