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Twenty-nine cotton genotypes with varying levels of susceptibility to Verticillium dahliae were grown in infested plots at Nazilli, Aydın, in 2008Aydın, in -2009. The highest level of disease incidence was recorded in cultivars 'BA-151', 'Celia', 'Çukurova-1518', 'Flaş' and 'Maraş 92', and averaged 85-95% for all genotypes in both years. The incidence of V. dahliae in seed averaged 29.8% for cv. Çukurova-1518, 27.6% for Flaş, 24.6% for cv. BA-151, 19.0% for cv. Celia and 16.2% for Maraş 92. Two hundred seeds from each genotype were planted, two seeds per pot, in a steam-pasteurized mixture of soil, peat, and sand. Pots were placed close to each other on a greenhouse bench to obtain a thick canopy. Typical disease symptoms appeared about 12-13 weeks after sowing. Maximum disease incidence values averaged 3.3% for Celia, 4.5% for Maraş 92, 8% for BA-151, 9% for Flaş and 9.5% for Çukurova-1518.

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