What are the methods for quickly thinning grapes?

Growers who have experience growing grapes know that thinning flowers, fruits and clusters not only promotes uniform grape berry size, good coloration, neat cluster shape and uniform ripening, but also improves grape quality. So, how do you quickly thin grapes?

1. How do you quickly thin grapes?

Generally, this is done immediately when the berries are about the size of soybeans and their quality can be distinguished; earlier is better than later. Remove diseased and pest-damaged berries, misshapen berries from poor fertilization, small seedless berries, berries with their tops facing inward, and berries squeezed in the middle of the cluster. It is best to leave 30-50 berries per cluster.

2. How do you thin grape flowers?

The best time for pinching off the tips is one week before flowering, and it should be finished by the time flowering begins. First pinch off the secondary cluster, then pinch off 4-5 lateral branches on the main axis, leaving 4-15 lateral branches, and then pinch off the tip of the cluster. Any rachis that is too long should be pinched off. When there are many inflorescences, leave 1-2 inflorescences on one fruiting cane, then pinch the tips, which saves labor and effort while not wasting nutrients.

The purpose of thinning inflorescences is: grapes have many inflorescences, which easily consume a large amount of nutrients and reduce the fruit-setting rate. Pinching off the tips of the inflorescences can reduce the number of flowers, ease competition for nutrients, and increase the fruit-setting rate.

3. How do you thin grape clusters?

When pinching off the cluster tips before flowering, more inflorescences should be thinned out. The standard for thinning fruit clusters is: a moderate cane with 11-12 leaves keeps 1 cluster, and only a strong cane with more than 21 leaves can keep 2 clusters. Second, when the fruit-setting situation can already be seen clearly, thin the clusters as early as possible, removing clusters with poor fruit set. According to the principle of 1 cluster per fruiting cane, remove the clusters on extremely weak canes and select and retain fruit clusters according to the goal of high yield.

To achieve high and stable grape yields, it is very necessary to thin out excess grape fruits.