Effect of spraying some mineral nutrients and methanol on berry sunburn and bunch rot in redglobe grapevines
2009
Omran, Y.M.A. | Shoieb, M.M. | El-Morsy, F.M.
Field experiments were conducted during 2005 and 2006 on 7-year-old grapevines cv. Redglobe grown in a clay loamy soil at 1.5x3 meters, used flood irrigation trained to double cordon with a load of 60 buds per vine ( 20 fruiting spurs: 3 buds / spur) pruning was carried out at the third week of January of each season to examine the effect of foliar sprays of some micro nutrients and methanol on berry sunburn and bunch (berry) rot in seeded Redglobe. Leaf content of chlorophyll a, b and carotenoids increased after spraying Ca, Zn, Cu and methanol. Foliar application of methanol increased bud burst percentage, all treatments significantly improved vegetative growth of the vine. Maximum yield weight and biggest bunch components resulted from methanol application (25%) compared to the control. Untreated vines gave the highest percentage of infected berries whether sunburn or rots (16.24 % per vine). Spraying Ca, Zn, Cu and their combination or methanol reduced percentage of infected berries by about (84, 88, 90, 82.4 and 88% respectively). All treatments increased total soluble solids (TSS %) and TSS / acid ratio; while, total acidity decreased. Application of Ca had no effect on anthocyanin content of berry skin; however, the rest of treatments increased anthocyanin content. Total carbohydrates in canes and weight of prunings per vine were increased by all treatments. There was a strong significant positive correlation between yield weight: weight of prunings and percentage of infected berries (r2 = 0.930).Most of the positive effects resulted form spraying 20% methanol.
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