Harvesting Table Grapes

The balance between sugar and acid in a grape berry determines its palatability. Though the timing of commercial table grape harvests may be guided by measurements of sugar and acid levels in the fruit, often the start of harvest of table grapes will simply be a matter of deciding when the grapes taste good. Grapes do not ripen off the vine, so their quality can only go down after picking. Picking too early may jeopardize your market. Picking too late may cause a loss of early market...

Gibberellic Acid Sprays

Gibberellic acid GA is a naturally occurring compound in a group of plant hormones called gib-berellins. GA application to table grape clusters may produce several responses. When it is applied to clusters early in their development, it may lengthen the cluster stem rachis to reduce cluster compactness. However, this response to GA application is often negated by the natural elongation of the cluster in a later stage of cluster development. Therefore, there is seldom a true cluster-loosening...

Suckers and Trunk Renewals

Vine Training Systems

The trunk of a grapevine may remain healthy for decades or become diseased or winter-injured after just one or two years. Therefore, the trunks of vines Fig. 2b - The cross-section of a node indicating a dead primary bud in the middle with live secondary and tertiary buds on either side. Fig. 2b - The cross-section of a node indicating a dead primary bud in the middle with live secondary and tertiary buds on either side. need to be managed for the specific conditions of a vineyard. Even under...

The Complete Grape Growers Guide

Grape Varieties for Indiana. Bull. HO-221. Lafayette, Ind. Purdue University. Cahoon, G., M. Ellis, R. Williams and L. Lockshin. 1991. Grape Production Management and Marketing. Bull. 815. Columbus, Ohio Ohio State University. Eichenlaub, V.L., J.R. Harman, F.V. Nurnberger and H.J. Stolle. 1990. The Climatic Atlas of Michigan. Notre Dame, Ind. University of Notre Dame Press. Ellis, M.A. 1995. Integrated Pest Management IPM Disease Management Guidelines for Grapes in Ohio....

Insect and Disease Control

Photos Table Grape Growing Stages

Most consumers have no tolerance for imperfections in table grapes, so the table grape grower must control grape insects and diseases. The first step is to recognize the principal insects affecting table grape production in a temperate climate grape berry moth, leafhoppers, rose chafer and Japanese beetle as well as the principal grape diseases powdery mildew, downy mildew, black rot, Phomopsis cane and leaf spot, and Botrytis bunch rot. Several excellent publications are available to assist...

Selecting Grape Varieties to Plant

More bad table grape varieties are available for purchase than good ones. Don't rush this decision. Though numerous high quality seeded table grape varieties are available for temperate-climate vineyards, the commercial grower should be mindful that the American consumer now has a 90 preference for seedless table grapes. That's the future, even though a few growers in the eastern United States still fresh-market significant quantities of 'Concord' and 'Niagara'. Hardiness is an important...

Vineyard Fertilization

Most temperate-climate vineyards benefit from nitrogen and potassium potash fertilization. Commercial growers need a comprehensive vineyard fertilization program involving petiole analysis Hanson, 1996 , but growers of small vineyards will very often do well if they provide vines with maintenance levels of nitrogen and potassium fertilizers. Apply 30 or 60 pounds of actual nitrogen per acre see Table 1 for amounts per vine to young vines in their first and second years of growth, respectively....

Section III Cultural Practices for Managing Mature Grapevines

Growing Table Grapes Pot

All cultural practices applied to grapevines are aimed at achieving the goals of acceptable yield and acceptable fruit quality. The intensity of a grower's vine management will reflect what he considers acceptable yield and fruit quality. Modest crops of imperfect fruit may be quite acceptable to a backyard grower, but such standards would put a commercial grower out of business. Several good vine management options for table grape production are presented below. Growers need to choose among...

Modified Arm Kniffiii Growers who do not

Four Arm Kniffin System Fence

Wish to construct trellis cross arms for the modified Munson training system can obtain many of the benefits of that system by utilizing a more simple two-dimensional training system called 4-arm Kniffin. William Kniffin developed this training system for grapevines in the Hudson Valley region of New York in the 1850s. He utilized four long fruiting canes for each vine. These canes were tied to two trellis wires at varying heights on the trellis Fig. 3a . In later years, as vines developed a...