What is the correct method for summer pruning of grapes?
How do you prune grapes in summer? Please explain the pruning method. Summer grape pruning can be done with reference to the following methods: Shoot removal. Shoot removal is generally carried out from grape bud break to the inflorescence emergence stage. The earlier the shoots are removed, the less nutrients are consumed. The method is: on the trunk and old canes, remove all sprouting buds, twin buds, thin and weak buds, diseased and pest-damaged buds, overly dense buds, and buds with few fruit, so that the retained buds are evenly distributed, grow vigorously, and fruiting is promoted.
How do you prune grapes in summer? Please explain the pruning method
Summer grape pruning can be done with reference to the following methods:
Shoot removal. Shoot removal is generally carried out from grape bud break to the inflorescence emergence stage. The earlier the shoots are removed, the less nutrients are consumed. The method is: on the trunk and old canes, remove all sprouting buds, twin buds, thin and weak buds, diseased and pest-damaged buds, overly dense buds, and buds with few fruit, so that the retained buds are evenly distributed, grow vigorously, and fruiting is promoted.
Pinching. The timing and number of pinchings should in principle be determined according to the variety, tree vigor and pruning method. Pinching at the flowering stage can stop new shoot growth for 10-15 days, direct nutrients to the inflorescence, ensure good pollination and increase the fruit-setting rate. Vigorous fruiting canes should be pinched leaving 4-6 leaves above the inflorescence, extension canes should be pinched leaving 12-20 leaves, and reserve canes should be pinched leaving 10-15 leaves; this helps promote fruit ripening and accelerate cane lignification. When bud growth is excessively vigorous, pinch several times to control cane growth and reduce nutrient consumption.
Lateral shoot management. Lateral shoots below the fruit cluster should all be removed; those above can be pinched leaving 1-4 leaves, and any lateral shoots that grow later should all be removed except for the topmost cane. On developing canes, lateral shoots should be pinched leaving 2-3 leaves; if later-emerging ones bear flower clusters, they can be retained, otherwise keep only the topmost one and remove all the rest.
Girdling. At the middle part of the node below the fruit cluster, use a small knife or girdling shears to remove a ring of bark 3-5 mm wide around the cane.
Removing tendrils and tying canes. To save tree nutrients, tendrils should be removed as much as possible. The 2-3 young tendrils at the shoot tip are best retained to maintain the growth point's dominance, and the tendrils should be removed only after the new shoot has extended more than 25 cm forward. To prevent canes from breaking and uneven distribution on the trellis, for a hedge trellis generally tie one at 30-40 cm along the cane, and for a pergola trellis generally tie one at 1 m along the cane.
Leaf removal. To improve the light conditions near the fruit cluster, some old leaves should be removed to promote fruit coloring. Generally, leaves are removed when the fruit softens.
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