Latest Analysis of the Causes of Flower and Fruit Drop in Grapes
Grapes are a type of grape, but they have a better mouthfeel and sweeter taste than grapes, and are deeply loved by consumers on the market. However, during their growth period, there will be flower and fruit drop, which has a great impact on the yield of grapes. So what are the causes of flower and fruit drop in grapes? Let's take a look together.
1. Variety characteristics
Flower and fruit drop in grapes is somewhat related to their variety characteristics. The female flower structure of some varieties is defective, some varieties show signs of stamen degeneration, or the pollination tree arrangement for female-fertile flower varieties is unreasonable. All of these can cause flower and fruit drop.
2. Physiological fruit drop
Throughout the entire growth process of grapes, there will be 1-2 instances of physiological flower and fruit drop. Generally, when the grape berries grow to 3-4 mm, some berries stop developing due to malnutrition and fall off. This is called physiological fruit drop.
3. Insufficient nutrition
If the nutrients stored in the tree body are insufficient in the early growth stage of grapes, the number of incomplete flowering stages will increase, bead development will be poor, and the pollen germination rate will be low, causing relatively severe fruit drop. In addition, grapes have a large number of flowers, so water and nutrient consumption is also relatively large. If trace elements are lacking during the grape flowering period, especially potassium, phosphorus, boron, etc., their pollen fertilization capacity will decline, causing flower and fruit drop.
4. Improper management
During the grape flowering and fruiting period, the demand for water and nutrients is relatively large. However, if fertilization and watering are improper during this period, flower and fruit drop will also occur, such as excessive application of nitrogen fertilizer or excessive watering. Also, when techniques such as shaping, pruning, and pinching are not up to standard, the contradiction between vegetative growth and reproductive growth during the flowering period intensifies, which can also lead to flower and fruit drop.
5. Poor climate
The suitable temperature during the grape flowering period is between 20-25 degrees. If the temperature during the flowering period is lower than 10 degrees, it will affect its normal flower bud differentiation. If the temperature during the flowering period is lower than 14 degrees, its floral organs will grow poorly and fall off. If the temperature during the flowering period is higher than 35 degrees, the floral organs will also lose water, wilt, and die. If there is continuous rainfall during the flowering period, the corolla cannot fall off normally and the anthers cannot release pollen normally, resulting in decreased pollination quality and causing flower and fruit drop. In addition, if there is insufficient light before flowering, the assimilation of its new shoots will decrease, and the nutrient supply back to the fruit cluster will be strained, causing flower and fruit drop.
The above is an introduction to the causes of flower and fruit drop in grapes. We hope it can help you. To learn more related knowledge, please stay tuned to us.