Covering the grapevine rows to delay the maturity and harvest date became widely practiced in 'Sultana Seedless' vineyards. The research work was conducted to test different cover materials (polypropylene cross-stitch, life pack, mogul and transparent polyethylene) in respect to their effects on grape quality and storability. Harvest was delayed for one month in covered plots. Harvested grapes were packed and transferred to storage rooms after pre-cooling. During packing, the grape clusters were sealed in PE bags with sulphur dioxide pads. The grapes were stored for 90 days in the first year and 120 days in the second year, at -0.5°C and 90% RH. All the grape clusters were healthy and of marketable quality after 90 days of storage period. In the first year, at the end of the storage, only those grapes harvested from the rows covered with polypropylene cross-stitch showed fungal growth. The sensory quality scores revealed a lower level of preference after 120 days of storage. The effects of the covering materials tested were similar regarding grape quality and storage performance except the transparent polyethylene that damaged the grapevine leaves.
Effects of fungicide spray programs on Grapevine powdery and downy mildew diseases control and some quality criteria of Cardinal and Sultana Seedless grapes Systemic fungicides may cause some physiological changes on plants besides their suppressive effects on plant diseases. In this study, effects of four different fungicide spray programs (for control of Grapevine powdery and downy mildew diseases) both on diseases control and some quality criteria of Cardinal and Sultana Seedless grapes were investigated. Trials were repeated three times in experimental areas of Manisa Viticulture Research Institute experimental areas in 2009-2011 years. The vines were sprayed with fungicides in 14-day-intervals according to the scheduled programs. Berry and bunch size, berry weight, soluble solids (brix°), yield, nutrient accumulation in leaves and powdery-downy mildew disease severity on bunches were examined in growth season or at harvest .Strobilurin spray programs increased berry size (up to 16.1% in width and 19.8% in length) and berry weight (up to 35%) in Sultana Seedless but it could not provide any significant increase in Cardinal grape in every years of experiment. However the spray program of this group retarded accumulation of soluble solids (brix°) in juice of Sultana Seedless grape. This corresponded to 7-8 days retardation with 2.8% brix point in 2011 year, compared to 1 Bu çalışma Gıda, Tarım ve Hayvancılık Bakanlığı, Tarımsal Araştırmalar ve Politikalar Genel Müdürlüğü tarafından desteklenmiştir.
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