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¹ Bingöl Üniversitesi Ziraat Fakültesi Bitki Koruma Bölümü, Bingöl
² Mustafa Kemal Üniversitesi Ziraat Fakültesi Bitki Koruma Bölümü, Hatay Viewed : 1855 - Downloaded : 902 Cotton is one of the most important agricultural crops providing raw material for many industrial sectors of our country. Also, Verticillium wilt (Verticillium dahliae Kleb.) is one of the important factors limiting production in cotton growing areas. There is no effective control method for Verticillium wilt disease, but the most effective control method against the disease is to use resistant cultivars. The experiment was conducted to determine susceptible of some cotton genotypes growing prevalent in Turkey against defoliating (T1) and nondefoliating (SS4) pathotypes of V. dahliae in the growth chamber conditions. Randomized plot design with 5 replications was set up in the experiment. Total 21 genotypes including two control cultivars (Giza 45,a resistant genotype and Albani 61-72, a susceptible genotype) were inoculated with conidial suspension method into crown. According to variance analysis (ANOVA) exhibited significant differences (P<0.05) among genotypes in terms of susceptibility against verticillium wilt. From the data, PYDV6 isolate (defoliating pathotype-T1) had higher disease incidence than Vd11 isolate (nondefoliating pathotype-SS4). Using PYDV6 and Vd11 isolates of V. dahliae, resistant control Giza 45 (0.39-0.69) had the lowest disease incidence, and followed by Julia (0.62), St-373 (0.63), Fibermax 819 (0.64) and Gloria (0.66) genotypes. On the other hand, susceptible control Albania 61-72 showed the highest disease incidence (2.00-3.02). Keywords : Cotton, Verticillium dahliae, Pathotype, Resistant