Prevention and control of grape fruit cracking

Grape fruit cracking is a very headache, it often affects the commercial value of grapes, but also vulnerable to diseases and insect pests, often caused by individual fruit cracking caused by a whole string of diseases, great losses. So how to prevent grape fruit cracking? The editor brings the details of the prevention and control methods of grape cracking. Let's take a look.

1. Variety selection

A large part of the cracking of grape fruit is caused by varieties, the soft degree of pulp of each variety is different, the thickness of pericarp is different, and the tightness of pericarp and pulp is different, which are the causes of fruit cracking. Seed selection should be made according to the local climate and soil conditions, and it is best to choose varieties that are not easy to crack, such as Jingya, Jufeng and so on.

2. Field management

It is most suitable to choose the sandy loam with loose and fertile soil, good drainage and good permeability, strengthen the management of water and fertilizer during the grape growth period, maintain the stability of soil water, not long-term drought or long-term stagnant water, and it is not suitable to irrigate heavy water after drought. all these will affect the water condition function of grapes. Rational fertilization provides nutrients for plant growth, with base fertilizer as the main fertilizer and topdressing as the auxiliary principle, base fertilizer is mainly organic fertilizer, with an appropriate amount of compound fertilizer, topdressing is mainly through nitrogen, phosphorus and potassium fertilizer and trace elements such as calcium and boron. Especially in the later stage, the application of boron and calcium can reduce the occurrence of fruit cracking.

3. Reasonable pruning

Reasonable pruning, pay attention to the proportion of fruit leaves, to prevent excessive pruning, resulting in fewer leaves left, so that the plant nutrient synthesis and water regulation ability decreased, to the late formation of fruit cracking. Generally speaking, 1-2 leaves should be retained for each ear, while the branches caused by growth should retain more than 25 leaves to enhance the water regulation of the plant. In addition, proper panicle thinning and grain thinning can make the grape grow healthily and avoid cracking fruit due to more fruit and insufficient supply of plant nutrients, or the fruit grows too densely, which is easy to cause fruit cracking.

4. Cultivation for shelter from rain

It is best to set up a shed when planting, so that the branches and vines can have a support point to grow, but also can play the role of shelter from rain, to prevent the occurrence of fruit cracking caused by diseases and insect pests caused by the rainy season. For example, setting up a shed on a grape rack or covering the ground with plastic film has an excellent effect on preventing fruit cracking.

5. Scientific use of medicament

Most of them will use a variety of chemicals to control diseases and insect pests, accelerate expansion and promote early ripening. These agents will stimulate the grapes and easily crack the fruit in the later stage. Therefore, when using pesticides, we should be scientific and reasonable, give priority to prevention when controlling diseases and insect pests, reduce the possibility of the occurrence of diseases and insect pests, and use fruit expanding agents produced by regular manufacturers when using expansion agents, in accordance with the instructions. Ethephon is generally used to promote ripening, we should pay attention to the concentration, low concentration, the effect is not obvious, high concentration will have side effects such as fruit cracking, falling leaves and falling fruits.

In view of this situation, rare earth can be sprayed during the period of grape expansion and coloring to prevent fruit cracking and fruit drop.

The above is the whole content of grape fruit cracking prevention and control methods, hope to help you, want to know more grape planting knowledge, please pay attention to us.