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Öğe Sensitivity of Verticillium dahliae to prochloraz and prochloraz-manganese complex and control of Verticillium wilt of cotton in the field(Elsevier Sci Ltd, 2003) Kurt, S; Dervis, S; Sahinler, STwenty-eight isolates of Verticillium dahliae from the cotton growing areas of Cukurova and Amik plains of Turkey were evaluated in vitro for their sensitivities to prochloraz and prochloraz-manganese complex. The fungicide sensitivity was determined by measuring mycelial growth on agar medium amended with prochloraz and prochloraz-manganese complex at dosages up to 100 mug ml(-1). The mean ED50 values for both locations ranged from 0.2590 to 0.3574 mug ml(-1) for prochloraz and 0.5239-0.8409 mug ml(-1) for prochloraz-manganese complex. The resistance factors for both fungicides were greater for the Cukurova than the Amik isolates. In field trials, the higher concentration of prochloraz (506 g a.i. ha(-1)) gave a slight reduction in disease severity. However, the higher concentration (1250g a.i. ha(-1)) of prochloraz-manganese complex resulted in a significant effect (P = 0.05) on disease control. (C) 2002 Elsevier Science Ltd. All rights reserved.Öğe Vegetative compatibility groups in Verticillium dahliae isolates from cotton in Turkey(Springer, 2005) Dervis, S; Bicici, MVerticillium dahliae Kleb. with a complicated genetic diversity is a widely distributed major pathogen resulting in cotton wilt, which causes high economic losses in cotton lint production in the cotton belt of Turkey. A collection of 70 Turkish V dahliae isolates (68 from wilted cotton plants in 28 districts and two from watermelon plants in two districts) were tested for vegetative compatibility by observing heterokaryon formation among complementary nitrate-nonutilizing (nit) mutants. The mutants were tested against international reference tester isolates and also were paired with one another. Thirty-nine isolates were assigned to vegetative compatibility group (VCG) 2B, 19 to VCG2A and three to VCG4B. One isolate was self- incompatible and eight others could not be assigned to any of the identified VCGs because their nit mutants showed negative reactions with the tester isolates of four VCGs or their nit mutants reverted back to the wild type. This is the first report of VCGs in V dahliae from cotton in Turkey.