Abstract
Twenty-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 μg ml −1. The mean ED 50 values for both locations ranged from 0.2590 to 0.3574 μg ml −1 for prochloraz and 0.5239–0.8409 μg 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 (1250 g a.i. ha −1) of prochloraz–manganese complex resulted in a significant effect ( P=0.05) on disease control.
Published Version
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