应用Ｎｉｔ突变体技术，对陕西９种寄主作物上的３８个大丽轮枝孢菌系进行了营养体亲和性研究。结果表明，３８个菌系中２个未产生Ｎｉｔ突变体，２个未产生Ｎｉｔ，和Ｎｉｔ＿ｍ突变体，其余３４个菌系产生了Ｎｉｔ＿１突变体，其中８个又产生了Ｎｉｔ＿ｍ突变休。对３４个菌系进行营养体亲和性测定结果分为４个亲和群（ＶＣＧ）。不同亲和群菌系致病力和寄主来源存在差异。 Nit mutants were used to study the nutrient compatibility of Verticillium dahliae 38 isolates from 9 host crops in Shaanxi province. The results showed that two of the 38 bacterial strains did not produce Nit mutants, two did not produce Nit, and Nit_m mutants, and the remaining 34 strains produced Nit_1 mutants, of which 8 again produced Nit_m mutation. Nutritional affinities of 34 bacterial strains were divided into four affinity groups (VCG). Pathogenicity and host origin of different affinity strains are different.