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谷子白发病菌分生孢子在一定湿度条件下,能从谷子的分生組織分蘖分枝幼芽、幼穗、幼叶、幼苗和胚芽上侵入而形成系統侵染发病;所产生的分生孢子与卵孢子侵染产生的分生孢子,在侵染致病特性上并无差異。在谷子各个生育阶段的病征也与卵孢子侵染完全一致,并丰产卵孢子。由于分生孢子的系統侵染,因此陕西省陕北和关中地区谷子白发病在多雨年份比少雨年份、低湿田块比高燥田块田間发病显著严重。白发病菌还可能通过分生孢子系統侵染而进行杂交产生新生理小种。
Under the condition of certain humidity, conidia of white hairy mildew can invade from the shoots, young spikes, young leaves, seedlings and embryos of meristem of millet and form the systemic infection; the conidia Conidia produced by conidial infection did not differ in the pathogenicity of infection. Symptoms in all stages of millet development were also identical with those of oospores, and oospores were abundant. Due to the systemic infection of conidia, the incidence of white millet disease in northern Shanxi and Guanzhong areas of Shaanxi Province was significantly more severe in the rainy years than in the rainy years, and lower wetland fields than in Gaozhantian fields. White germs may also hybridize through the conidial system to produce new species of race.