The Latest Methods to Improve Fruit Set Rate in Kyoho Grapes

Kyoho grape is a European-American hybrid variety with extremely strong adaptability and disease resistance. It is one of the main cultivated grape varieties at present and is widely planted around the world. However, many fruit growers report that its fruit set rate is relatively low when growing it, so how can the fruit set rate of Kyoho grapes be improved? Let's find out together.

I. Reasons Affecting the Fruit Set Rate of Kyoho Grapes

There are many reasons affecting the fruit set rate of Kyoho grapes. The first is temperature. The suitable temperature during the flowering period of Kyoho grapes is 26-30 degrees. If it remains above 30 degrees for a long time, it will cause continuous and severe flower drop, leading to a decline in the fruit set rate. Also, excessively vigorous tree growth can affect its fruit set rate. The more vigorous the tree growth, the more severe the flower drop. In addition, branches and shoots that are too dense can also easily lead to fruit drop. Pruning the shoots after flowering can also cause fruit drop. Among diseases, gray mold and brown blight can also affect its fruit set rate. Soil that is too wet can also lead to severe fruit drop. There are still many other reasons causing its low fruit set rate.

II. How to Improve the Fruit Set Rate

1. Control tree vigor

For plants with excessively vigorous growth, measures should be taken to control vigor and keep new shoots below 70 cm, which is beneficial for fruit set. If the new shoots reach more than 80 cm in length before flowering, the fruit set rate will be relatively low. In addition, fertilizer and water should be controlled during new shoot growth to avoid excessive new shoot growth. After fruit set, compound fertilizer and two kinds of potassium sulfate should be applied as topdressing, which can promote fruit growth and reduce fruit drop.

2. Pinching

Pinching can be carried out about one week during the flowering period, which can concentrate nutrients to the inflorescence and is beneficial for fruit set. Attention should also be paid to the method of pinching. Generally, inflorescences with weaker growth should be pinched by leaving 5-6 leaves, while inflorescences with vigorous growth should be pinched by leaving 3-5 leaves.

3. Spraying growth retardant

About one week during the flowering period, a growth retardant can be sprayed, which can significantly improve the fruit set rate. The commonly used growth retardant is mepiquat chloride aqueous solution. Generally, each 15 mg bottle is diluted with 15 jin of water. For vigorous growth, the concentration can be increased to each bottle diluted with 12 jin of water.

4. Control yield

Flower and fruit thinning in grapes can reduce nutrient consumption by the plant, prevent the plant's nutrient burden from being too heavy and causing premature aging, and balance the plant's vegetative growth and reproductive growth. Controlling yield can significantly improve the fruit set rate and quality of grapes. Generally, the yield per mu is controlled at about 3500 jin, each cluster of fruit is required to retain 20-25 effective leaves, the 3-5 leaves above the fruit cluster do not retain secondary shoot leaves, secondary shoot leaves begin to be retained from above the 5th leaf, and each fruit cluster retains about 40 berries.

The above is an introduction to how to improve the fruit set rate of Kyoho grapes. We hope it can help you. To learn more related knowledge, please stay tuned to us.