Document Type : Research Paper
Southeastern Anatolia Agricultural Research Institute, P.K: 72, 21110, Diyarbakır, Turkey.
Plant Protection Research Institute, Diyarbakır, Turkey.
Dicle University, Faculty of Agriculture, Plant Protection Department, Diyarbakır, Turkey.
The objective of this study was to determine the effect of Verticillium dahliae
Kleb. on cotton yield and fiber technological properties, relationships among to
disease and seed cotton yield, fiber yield and fiber technological properties and also
determine susceptible and tolerant cotton varieties. The study was conducted in the
Southeastern Anatolia Agricultural Research Institute’s experimental area during
2004-2006. The experiment was arranged as a randomized split block design with
four replications. Main plot consisted of infected and non-infected area, sub-plot
consisted of varieties. In this study 10 different commercial cotton varieties were
grown to test the verticillium wilt performance. The results indicated that there were
significant differences among varieties for all of the investigated characteristics. Area
differences were significant for all of the investigated traits except ginning
percentage. The results of the non-infected area showed that there were decreasing
with regard to foliar disease index (FDI), vascular disease index (VDI), vascular
disease rate (VDR), first picking percentage, fiber fineness, micronaire and
yellowness; while increasing with regard to seed cotton yield, fiber yield, fiber
length, strength, elongation, uniformity, reflectance and spinning consistecy index.
Only ginning percentage was unaffected from area differences. With planting cotton
varieties in non-infected area there were 323.60 kg ha-1 increase for seed cotton yield
and 114.50 kg ha-1 for lint yield. Disease led to a decrease (7.86%) in seed cotton
yield and (6.73%) in fiber yield. The results of this study indicated that GW-Teks,
GW-Golda and Carmen varieties were tolerant; while Maraş 92, Sayar 314 and
Stoneville 453 were sensitive in terms of FDI, VDI and VDR and tolerant varieties
can be used as parents in Verticillium breeding programs.