The invasion risk posed by the xylem feeding hemipteran, Homalodisca coagulata (native to the southeast USA and northeast Mexico, and a recent invader of California (USA) and Tahiti) and a xylem-dwelling phytopathogenic bacterium, Xylella fastidiosa (native to the Americas and causative agent of Pierce’s disease of grape vines), was examined using the computer climate modeling program CLIMEX. M...

Changes in carbohydrate metabolism during grape berry development play a central role in shaping the final composition of the fruit. The present work aimed to identify metabolic switches during grape development and to provide insights into the timing of developmental regulation of carbohydrate metabolism. Metabolites from central carbon metabolism were measured using high-pressure anion-exchan...

Vine vigour involves the production capacity of the vine. Production capacity encompasses shoot and leaf production, as well as grape production. It would benefit grape production systems to find the correct balance between the vegetative growth (shoot and leaf “production”) and reproductive development (grape production). One could optimise vine performance by improving vine balance. Vine bala...

Background and Aims Water deficit modifies the concentration of aroma compounds grape berries, but little information is available on effect deficits applied at different phenological stages. We evaluated irrigation glycosylated volatile organic (VOCs) responsible for berries Sangiovese Merlot cultivars grafted 1103P or SO4 rootstocks. Methods Results Vines were subjected to either pre- post-ve...

The magnitude of demand for planting materials in grape, mainly for rootstock genotypes indicates that micropropagation is inevitably necessary for their mass scale propagation. Therefore, the studies on micropropagation of four genetically different grape rootstocks namely Dogridge (Vitis champini), SO4 (V. riparia× V. berlandieri), H-144 (V. vinifera × V. labrusca) and 3309 C (V. riparia × V....

One of the most important operations in managed gardens is pruned grapes. For evaluate the effect of pruning short, medium, heavy on yield and yield components of Taif grapes, before and after the cold winter, in the years 2012 to 2013, A factorial experiment in a CRBD design with five replicates were performed on two factors. The first factor was the number of buds per stem and included the th...

Responses of young non-fruiting grapevines, Vitis labrusca (L.) var. ‘Niagara’, to defoliation were examined at two stages of vine growth when beetles typically infest vineyards. In the first experiment, vines were caged and subjected to two weeks of feeding by 0, 10, 20, or 40 adult Macrodactylus subspinosus Fabricius (Scarabaeidae: Macrodactylini) during bloom, or to the same range of adult P...

Abstract Sunlight and heating influence leaf grape metabolism therefore wine quality. As a recent management tool, no information exists on the effects of grapevine row orientation composition Syrah vines within context double pruning management, technique used to transfer harvest from wet summer dry winter season. This is first attempt investigate north-south- (NS) east-west- (EW) oriented vin...

Grapevines can be modified by various trellising and pruning methods so they may be successfully mechanized. There are six conditions that must be optimized to successfully mechanize a vineyard. A properly trained vine allows efficient operations with out excessive damage to the vines or reduction of fruit yield and/ or quality. Shoot positioning can be accomplished efficiently with machines wh...