甲、白发病的调查及试验研究的结果:1.山东白发病的发生情况:在山东大部是谷子和其它作物轮作,所以白发病是不十分严重的。白发病主要靠土壤传染(白发病胞子在土壤内的生活力有三年之久),但经轮作一年以后,就可以减轻,同时因为白发病胞子的侵入,须要相当的湿度,而山东历年春季多旱,胞子难以发芽,更难以侵入为害。 A, white hair of the investigation and experimental research results: 1. Shandong white hair disease occurs: most of the millet and other crops in Shandong rotation, so white hair is not very serious. White hair disease is mainly transmitted by soil (the vitality of white-hair disease cells in the soil is three years old), but after a year of rotation, it can be alleviated. At the same time, due to the invasion of white hairy-hair cells, considerable humidity is required. More drought, spores difficult to germinate, more difficult to invasive damage.