In the whole growth process, fruit thinning plays an important role in the growth of grapes, and is the key to determine the spike shape, particle size and chromaticity of grapes. Grapes generally need to be thinned twice, following the principle of thinning flowers first and then cutting after thinning; Spare the big and leave the small, and leave the good for the bad; The principle of moderate density and quality assurance. Grape fruit thinning is mainly to cut short or shave off the branches that are too long and too dense, cut off a single layer of fruit particles, and trim the twisted ear tips or large and small particles with fruit thinning scissors to make the fruit ears columnar.
The first thinning of grapes is usually 3-4 weeks after flowering. At this time, the fruit grain is about the size of soybean grain, so it is necessary to fully relieve and remove the overloaded fruit. The earlier the fruit is set, the more stable it is, which not only saves labor, but also fully increases the fruit size. You can't thin the fruit too early. It is not easy to distinguish large and small fruits from real fertilized fruits, which is easy to cause yield reduction. Too thin will waste nutrition.
Matters needing attention in thinning grapes
Grape seedlings are usually cut with sharp scissors, and cannot be picked directly by hand, so as not to hurt the plants, and the scissors need to be disinfected before use. If you cut the fruit with pests and diseases, you need to disinfect the scissors to avoid pests and diseases infecting other healthy fruits. When thinning fruits, try to choose fruits with the same size and orderly outward arrangement.
When the grapes are sparse, it depends on the fruit setting rate. The ear with high fruit setting rate should be sparse, and the ear with low fruit setting rate should be sparse. If there is dew, it is best not to thin the fruit to prevent sunburn. When thinning the fruit, try to reduce the contact between your hands and the surface of the fruit to avoid hurting the fruit particles. Don't turn your ears back and forth when thinning the fruit to avoid twisting the fruit handle.