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Öğe Assessment of Tolerance Level of some Cotton (Gossypium hirsutum L.) Varieties against Verticillium wilt (Verticillium dahliae Kleb.)(Univ Agr Sci & Veterinary Med Cluj-Napoca, 2010) Karademir, Emine; Karademir, Cetin; Ekinci, Remzi; Baran, Behzat; Sagir, AbuzerThe objective of this study was to assess the tolerance level of some cotton varieties against Verticillium wilt (Verticillium dahliae Kleb.) disease. Verticillium wilt is one of the major constraint diseases of cotton production worldwide and also in Turkey. The study was carried out at the Southeastern Anatolia Agricultural Research Institute's naturally infected experimental area during 2004-2006. In this study, 10 different commercial cotton varieties were used as plant material. The experimental design was a randomized complete-block with four replications. During the cotton growing season, foliar disease index (FDI), vascular disease index (VDI) and vascular disease rate (VDR) were observed in addition to seed cotton yield and some fiber quality characteristics. According to the results, it was determined that with regards to FDI, VDI and VDR, the most tolerant varieties were 'GW-Teks', 'GW-Golda' and 'Carmen', while the most sensitive varieties were 'Maras 92', 'Sayar 314' and 'Stoneville 453'. The other varieties had moderate tolerance levels. The highest seed cotton yield and lint yield were obtained from 'DP-Deltaopal' and 'Stoneville 453; These results showed that some sensitive varieties had high yield; the reason for this situation may be related with early or late occurrence of the disease. The result of this study indicated that 'GW-Teks', 'GW-Golda' and 'Carmen' varieties must be preferred for infected areas; on the other hand, 'DP-Deltaopal' and 'Stoneville 453' can be recommended and grown in uninfected areas. Additionally, 'Carmen', 'GW-Teks' and 'GW-Golda' varieties can be used as material for improving disease resistance in cotton breeding programs.Öğe Determination of long-term effects of consecutive effective soil solarization with vesicular arbuscular mycorrhizal (VAM) on white rot disease (Sclerotium cepivorum Berk.) and yield of onion(Gaurav Soc Agricultural Research Information Centre-Aric, 2010) Cimen, Ismail; Pirinc, Vedat; Sagir, AbuzerThe aim of this study was to increase the yield in the fields solarized two years earlier (2007) by reducing the white rot disease in onion resulted from Sclerotium cepivorum caused by Vesicular Arbuscular Mycorrhizal (VAM), Glomus intraradices fungus. Study was conducted in two different experiments (the first experiment where tomato was grown after solarization; the second experiment where lettuce and pepper in previous growing seasons were grown after solarization). Pearl bulb onions were grown with four repetitions according to split-split plot design (2008). In the experiments, the consecutive effects of solarization were considered as main and of sub-VAM and S. cepivorum as mini plots. With the artificial inoculation of S. cepivorum, sufficient disease symptoms were not detected in the onion bulb; however, it reduced the thickness of leaves and stems. And for these two development parameters, results were found significant (P<0.01). Bulb onion yield decreased by 11% in the first experiment and 16% in the second experiment with the S. cepivorum inoculation. The effect of solarization on yield in the second year was higher than in the third year. In the second consecutive season (experiment 1), both of shallot and bulb onion yield increased by 25%, and in the third season (experiment 2), yield increased by 18% for bulb onion. Leaf and stem thickness increased with VAM, but decreased by S. cepivorum. Results were found to be significant (P<0.01) for both the experiments. Consequently, thanks to VAM, product yield increased in both the experiments, and the increments were determined as 22% for shallot; as 25% for bulb onion yield in the second experiment. The effects of solarization combined with VAM increased bulb onion yield by 50%, compared to without both of them. Among the combinations, the highest yield was achieved with the Sol-VAM-non-S. cepivorum application in comparison to non-solarized-non-VAM-S. cepivorum, through this application provided an increase of 54.41% for the first and 91.13% for the second experiment. In conclusion, the effect of solarization, gradually became less effective, in the second and third production seasons. Development of onion alternating in these seasons and loss of yield caused by S. cepivorum could be reduced with artificial VAM inoculation. However, this effect must have depended on the relation between plant species and mycorrhizal colonization in earlier seasons.Öğe Effects of solarization and vesicular arbuscular mycorrhizal fungus (VAM) on phytopthora blight (Phytophthora capsici leonian) and yield in pepper(Academic Journals, 2009) Cimen, Ismail; Pirinc, Vedat; Sagir, Abuzer; Akpinar, Cagdas; Guzel, SadettinIn this work, effects of soil solarization and vesicular arbuscular mycorrhizal (VAM) fungus, Glomus intraradices on diseases caused by Phytophthora capsici Leonian in pepper plants and crop yields were studied. At the end of the growth season, 82.5% mortality of plants and 47.7% of yield loss caused by P. capsici were obtained in control plots. At the beginning of the vegetative period, plant mortality caused by P. capsici in solarized plots was less than that in non-solarized plots, but it was higher at the end of the experiments. The total crop yield, however, increased to 20.9% by solarization. At the beginning of the growth season, anthocyanin production, early flowering and fruit settings were observed in the seedlings inoculated with VAM. Plant mortality caused by P. capsici was inhibited by 69.4% in plants inoculated with VAM fungus, but this rate decreased to 14.9% at the end of the experiment. On the other hand, total yield increased to 40.4% in plots infested with P. capsici, but treated with VAM. The total yield increased to 49.9% in pathogen free solarized + VAM inoculated grown plants plots in comparison to pathogen free non-solarized + non-VAM inoculated grown plants plots. This increase was 42.8% in solarized + VAM inoculated grown plants plots, which were infested with P. capsici. Total yield was 227% in solarized + VAM inoculated grown plants plots without P. capsici in comparison to non-solarized plots + non-VAM inoculated grown plants plots but infected with P. capsici. The yield loss caused by P. capsici in pepper was decreased by means of long-term effect of soil solarization with artificially VAM inoculation.Öğe The evaluation of durum wheat landraces for resistance to wheat yellow rust (Puccinia striiformis f. sp tritici) in the Southeastern Anatolia Region, Turkey(Wfl Publ, 2009) Alp, Aydin; Sagir, AbuzerFifty wheat samples collected from 11 different durum wheat landraces produced in the central district and villages of Diyarbakir province were used as study materials. Suspension, prepared as 352,000 spores per ml by using the spores composed of a mixture of yellow rust (Puccinia striiformis f. sp. tritici) species provided by the Field Crops Central Research Institute, was injected into plant tissue in the pre-earing stage during the 2004-2005 and 2005-2006 growing seasons. Of the 50 durum wheat landrace samples 15 used in the study were classified as resistant to yellow rust, 19 as semi-resistant and 14 as semi-susceptible. Moreover, it was also found that one sample from the A sure landrace was in the susceptible group with the highest rust intensity of 61.68% while one sample from the Ruto landrace was found to be in the immune group with an intensity of 0%.
