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    Biological Control of Cotton Seedling Diseases by Fluorescent Pseudomonas spp.
    (Ankara Univ, Fac Agr, 2016) Erdogan, Oktay; Bolek, Yuksel; Gore, M. Erhan
    Seedling root rot seen in many plants including cotton is an important disease that leads to large economic losses. Human health and the environment are negatively affected as a result of using fungicides for disease control. The goal of this study was to determine the effects of fluorescent Pseudomonas (FP) bacteria against seedling root rot pathogens both in vitro and in vivo conditions. 59 FP isolates obtained from the rhizosphere of cotton and weeds on the field were tested by dual-culture assays in vitro. After applying effective FP isolates on the seeds, antagonistic effects against the seedling root rot pathogens were investigated in a climate chamber. Resulting of dual-culture tests, FP40 had maximum effect (49.60%) against Rhizoctonia solani. Besides, FP51, FP48 and FP35 had highest impact as 43.80%, 43.50%, and 43.10% against Fusarium sp., respectively. Pythium deliense was mostly effected by FP57 (59.80%), FP52 (57.80%) and FP56 (57.60%). While isolates FP35 and FP57 provided protection over 70% against all three pathogens in a climate chamber, they were as effective as commercial fungicides (Vitavax and Maxim) and biofungicide (Subtilex) and shown promising results.
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    THE DETERMINATION OF RELATIONSHIP BETWEEN VERTICILLIUM WILT (Verticillium dahliae Kleb.) AND EARLY MATURITY IN COTTON (Gossypium hirsutum L.)
    (Soc Field Crop Sci, 2013) Erdogan, Oktay; Ozbek, Nedim; Unay, Aydin; Gore, M. Erhan
    The present study was conducted to investigate the relationship between earliness of crop maturity and Verticillium wilt. Ten cotton genotypes were evaluated in natural infection under field conditions of Nazilli Cotton Reseach Institute in 2006 and 2007. Foliar disease index (FDI), vascular disease index (VDI), days to flowering (DF), days to boll opening (DB) and seed cotton yield (SCY) were determined. In regard to FDI and VDI, the most tolerant genotypes were Carmen (standard cotton cultivar), NGC, GSN 12 and M25-G, while the most sensitive genotype was NP Ozbek-100. NMCH-11/4, NCCH-9/2 and NCCH-8/1 were other sensitive genotypes. The performances to verticillium wilt of other standard cotton cultivars, Nazilli 84 S and Sayar 314 were non-stabile. The maturity characteristics, DF and DB, were significant negative correlated with all Verticillium severity parameters, whereas these characteristics were significant positive correlated with SCY. Carmen cultivar should be recommended for infected areas and improving diseases tolerance in cotton breeding programs.
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    The relationship of verticillium wilt and seed surface microflora with gossypol level in cotton (gossypium spp.)
    (Parlar Scientific Publications, 2017) Erdogan, Oktay; Ozgonen-Ozkaya, Hulya; Gore, M Erhan
    The aim of study was determined to relationship between on the seed surface microflora and reaction to Verticillium wilt of cotton cultivars with different gossypol levels. Thirteen cotton cultivars were examined gossypol level and the seed surface microflora of the cotton in vitro. Then, these cultivars were observed susceptibility to non-defoliating (Vd11 isolate) and defoliating (PYDV6 isolate) pathotypes of Verticillium dahliae Kleb. in vivo. Cultivars we significant at (p<0.05) probability leval for level for disease intensity values in vivo and gossypol values in vitro. While the highest gossypol value was determined in Gloria cultivar (Gossypium hirsutum L.) with a 1.669 ?g mL-1and resistant control Giza 45(Gossypium barbadense L.) with a 1.343 ?g mL-1, the lowest gossypol value was found in Gossypolsuz Nazilli (0.196 ?g mL- 1) and susceptible control Cukurova 1518 (0.484 ?g mL-1) of G. hirsutum L. While the lowest of disease intensity value was observed Vd11 isolate and PYDV6 isolate in the highest gossypol, resistant control Giza 45cultivar (0.30-1.11). The highest disease intensity values were found in the lowest gossypol, Gossypolsuz Nazilli cultivar (2.24-2.82) and susceptible control Cukurova 1518 cultivar (2.00-2.63), respectively. Fungus species were isolated in high and low gossypol of cotton seeds at the same rate. © by PSP.