A PRELIMINARY REGIONALIZATION OF CROP PATHOGENIC FUNGI IN TIBET
西藏农作物病原真菌的区域分化初探*

An attempt has been made in this paper to describe briefly regionalization of crop pathogenic fungi in Tibet, base on field investigation. According to crop communities, climatic types and distribution of pathogenic fungi , a scheme of regionalization into 5 zones has been proposed : 1)Warm humid zone in southern slop of Himalaya predominant pathogens are Diplodia zeae, Helminthosporium turcicum, Helminthosporium setariae, Helminthosporium oryzae,Physoderma maydis, Piricularia grisea, etc. are predominant. 2)Eastern Tibet warm and sub-humid zone: Alternaria brassicae., Alternaria brassicola,Blumeria graminis, Erysiphe graminis, Fusarium avenaceum,Gerlachia nivalis, Septoria nodorum, septoria tritici, puccicinia striiformis, peronospora parasitica,etc are predominant. 3)Southern Tibet warm and Semihumid zone: Albugo candida, Gerlachia nivalis, Drechslera graminea, Selenophoma tritici, Tilletia caries, Tilletia foetida, ,Ustilago nuda and Ustilago hordei are predominant. 4)Western Himalayan cool and arid zone: Drechslera graminea, Ustilago nuda ,Ustilago hordei and Puccinia striiformis are predominant. 5)Qiangtang plateau arid and frigid zone : Crop are sparse and crop pathogens are sporadic and cause no destruction.