Abstract:

It conduced an investigation in Hetan town of Dongxiang, Lianhua and Nanyuan town of Linxia, Yinchuan and Anji town of Jishishan, where the main cultivated area of Z. bungeanum‘Linxia cijiao’. Through numerical model Ⅰ analysis of 149 sample date, that was index of infection of black shank of Z. bungeanum with topography, irrigating, selection. Investigate and determine location, interplanting type, tree age, amount of tree per unit area, rate of tree shadow to ground, level of management, and so on. The results showed that irrigating was the leading factor that affected transformation of index of infection of black shank of Z. bungeanum. Every fact affects level was: irrigating>interplanting type> amount of tree per unit area>topography> level of management> tree age> location> rate of tree shadow to ground. Perfect match of reducing index of infection of black shank of Z. bungeanum was: B13+B23+B32+B41+B51+B62(B64)+B72+B82. Through comparative analysis of 159 sample date, incidence and disease extent of black shank of Z. bungeanum ‘Linxia cijiao’was different in different location. Disease extent of black shank of Z. bungeanum was serious 7-8 times in center than border and ridge. And a proposed technical measure of prevention of black shank of Z. bungeanum was developed.