What causes shriveled berries in grapes?

When eating grapes normally, you occasionally find a few smaller, lighter-colored, firmer grapes in a bunch, which taste sour and astringent. These grapes are what are called shriveled berries. Shriveled berries generally have no edible value, so what are the causes of shriveled berries in grapes?

1. Causes of shriveled berries in grapes

1. Environmental factors: too low temperatures during the flowering period, lack of light, and poor pollination and fertilization can all cause shriveled berries;

2. Management factors: improper fertilization leading to a lack of elements such as zinc and potassium in grapes, and improper use of plant growth regulators can also cause shriveled berries;

3. Disease factors: shriveled berries appear when grapes are infected with black spot disease, sunburn, Pierce's disease, and so on;

4. Other factors: American-European hybrid varieties are more prone to shriveled berries than European-Asian varieties.

2. How to prevent and control shriveled berries in grapes?

1. Field management needs to be done well. During the grape flowering period, pay attention to keeping warm and ensuring sufficient light. At the same time, water reasonably, generally watering in the morning and after 6 p.m. Do not use flood irrigation; drip irrigation is a better method.

When the flowering period is dry, a moderate amount of water can also be applied to ensure pollination and fertilization in grapes.

2. Fertilize scientifically. If shriveled berries appear in grapes, promptly supplement trace element fertilizers such as boron, iron, zinc, and magnesium. At the same time, also pay attention to pruning overly dense branches, slender branches, diseased and pest-damaged branches, and so on.

3. Prevent grape diseases and pests. After fruit thinning, fungicides can be sprayed on the grapes and bagging can be carried out, which can effectively prevent diseases and pests.

When choosing paper bags for bagging, also choose according to the grape variety and local climate. If the light is relatively strong, it is best to choose one with weaker light transmittance to avoid sunburn.