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What are the reasons for grape cracking? How to do?
First, the cause of fruit cracking: Grape cracking fruit is a long drought in case of rain or irrigation, so that the rapid increase in soil moisture, fruit within the rapid expansion of water absorption, while the peel expansion is slow, resulting in cracking. The second is caused by pests and diseases. Such as white rot, black bean disease and spider mites, locusts and other damage, resulting in fruit surface cracks. Third, improper cultivation techniques. Second, crack prevention: 1 to maintain the berry growth period, especially the fruit coloring to maturity, soil moisture in an adequate and stable condition, attention to timely drainage in a long time, to ensure smooth drainage. 2 Do a good job of tree management. Excessive leaves, excessive leaf area, and heading and excessive fruit retention will affect the nutritional supply of the fruit. The fruit ripening effect is thin and brittle, which can easily lead to fruit cracking. Therefore, management must adopt reasonable methods to adjust the population structure and improve lighting conditions. Through sparse crops, the load of the tree body must be adjusted. The general benchmarks for maintaining vines and leaving ears in production are as follows: grape shoots are kept at a distance of about 10 centimeters from the tip of the plant, and fruit spikes are from 15 to 20:1. The varieties with a strong branch or a small ear can retain 2 spikes, leaving a fruit in the mean tree branch. , weak branches do not leave ear. In time, the deputy panicles and panicle spikes conserve nutrients in the tree body, increase the nutrient supply level of the fruit, and make the ear size moderate. 3 rational use of drugs, prevention and control of pests and diseases. Do a good job in pest monitoring and forecasting, seize the key to prevention and control, and spray medicine in time.