First, the leading cause of fruit cracking Kyoho grapes Kyoho grape cracking occurs in the harvest time. Kyoho grape fruit has poor anti-feathing pressure and is sensitive to ethylene. When the fruit is near mature, the content of ethylene in the fruit is high, so the fruit is easy to form cracking fruit; the fruit grows in a dry and dry period, the fruit matures when it encounters more rain or even rain, and such weather is over. Rapid high temperature and dryness are very easy to crack fruits. The tree potential is weak, but the amount of fruit is too large, the fruit is too tight, and it is easy to cause serious fruit drop. The use of nitrogen fertilizer is more; the grape on the clay ground is prone to drought, and the rapid changes in the external environment are easy. As a result of traditional pruning methods, following the traditional pruning method, the picking of the heart resulted in fewer leaves to be taken, which reduced the ability of the tree to regulate the moisture, and it was easy to cause fruit cracking in the event of rain. The application of ethephon resulted in ripening of the cracked fruit, in which large and early cracking was serious.
Second, crack prevention measures
1, in the early and middle fruit growth, pay attention to more spray or irrigation, so that the skin pores of the secondary epidermis cell wall and fruit stems will be significantly developed, can increase the critical bulge caused by split fruit; on the ear and near leaves, spray naphthalene acetic acid 15 mg / kg plus abscisic acid 100 mg / kg, can play a role in increasing fruit bulge and enlargement of fruit and extend the life of the leaf. At the late stage of growth, try not to delay or delay the administration of ethephon ripening.
2. The vineyard cover film can prevent excessive accumulation of rainwater in the roots, inhibit the evaporation of surface moisture, and reduce soil moisture changes. In drought, the combination of mulching film and irrigation can effectively prevent grapes from cracking.
3, Kyoho grape result is too large, will cause poor fruit coloring, cracking fruit increased, so we must pay attention to adjust the amount of results, because the tree is scheduled to produce, reduce cracking.
4. Appropriate amount of nitrogen fertilizer should be applied. Increase the application of phosphorus and potassium fertilizers, apply more organic fertilizer, and increase the amount of calcium fertilizer in sticky soil.
5, change the traditional topping method, leaving more leaves. All the shoots above the ear were left with 2 leaves topping and all winter buds and summer buds between the branches of the shoot were removed. Achieve 25-26 pieces of normal leaves per fruit branch and enhance the function of tree to regulate moisture.
6, in the early cracking fruit spray naphthalene acetic acid 20 mg / kg plus abscisic acid 100 mg / kg twice, can inhibit the activity of ethylene in plants, can better prevent the crack caused by the application of ethephon.
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