What if the grapes don't bear fruit?
Today, Xiaobian explains in detail what to do if grapes fail to produce results and his experience in green plant maintenance by analyzing the causes and countermeasures. Next, Xiaobian of the site introduces it to netizens.
The failure of grapes to bear fruit mainly refers to the failure of grape plants to bloom, failure of flowers to bear fruit, failure of flowers to bear fruit, and failure of fruits to bear fruit. The main reasons for the failure of grapes to bear fruit are improper management of water and fertilizer, pest control and pruning, and may also be caused by the failure to provide female flowers. The inflorescences of the plant are pollinated, the climate is inappropriate, and the plant has not reached the fruiting age. Here is a detailed account of the reasons why grapes fail to bear fruit and countermeasures. 1. Reasons why grapes do not bear fruit 1. Variety reasons Most Eurasian grape varieties have bisexual flowers and can be self-pollinated. But some are female flower grape varieties that require cross-pollination to bear fruit, such as donkey milk, pink corna, longan, black broken yellow, black corna, angwen, autumn honey, black betty, Russian conker, Jinhou, early-maturing black tiger fragrance, Crimuposi, Lagate and Italian rose.
2. Management mistakes Due to management negligence such as not timely introduction of new branches, picking and thinning flowers and buds, or management mistakes such as excessive pruning, excessive application of nitrogen fertilizer before flowering or excessive irrigation during flowering, grapes will fall out of flowers and fruits.
3. Insufficient fertilization For grapes with insufficient fertilization at young seedling stages, it may cause incomplete development of flower ovules and failure to develop well after pollination. Due to excessive use of nitrogen fertilizer during flowering, flowers will be dropped during flowering. If there is insufficient fertilization, the plants will not grow well and will not bear fruit.
4. Pests and diseases. Grape plants are infected with pests and diseases during flowering, which can also cause flowers and fruit drop.
5. For climatic reasons, if the temperature is not higher than 10℃ for a long time before the flowering period of grapes, flower buds cannot differentiate normally. If there is insufficient light before flowering, it may cause too little nutrient accumulation in new shoots, resulting in insufficient nutrients for fruit growth, causing fruit drop. The temperature at the flowering stage will continue to be lower than 14℃, and flower drop will also occur. Too much rainfall during flowering period will cause flower ears to fail to pollinate normally.
6. Different grape varieties have different fruiting ages. Some grape varieties take a long time to bear fruit, while others can bear fruit in one year. For example, Jasmine Grape and Xinghua No. 1 Grape, which can bear fruit in the second after planting. If seedlings are sown, it will take years to bear fruit. 2. Countermeasures for grapes not bearing fruit 1. Artificial pollination Artificial pollination can improve the fruit bearing rate of grapes and the aesthetics of the ears by gently shaking the blooming new shoots, and raising bees in the orchard to increase the success rate of pollination. For grape varieties with female flowers, manual pollination must be carried out. In this case, pollen needs to be collected from the ears of plants with hermaphrodite flowers and then pollinated to the ears of female flowers.
2. Fertilization during the growth period For grape plants at the fruiting age, topdressing should be applied before spring germination, mainly nitrogen fertilizer, and appropriate amounts of phosphorus and potassium should be increased. Organic fertilizer should be supplemented during the growing period. Nitrogen fertilizer should not be applied before flowering, and appropriate nitrogen fertilizer can be used only after fruit setting.
3. Fertilization during flowering period. Plants need sufficient fertilizer during flowering period. Spray 0.3% boric acid solution once during the bud pregnancy period, after flowering and full flowering period. The same amount of lime can be added to the boric acid solution. Phosphorus and potassium fertilizers should also be applied during flowering to protect flowers and fruits.
4. Water management requires reasonable irrigation during flowering period, the amount of irrigation should be controlled 3 to 5 days before flowering, and soil drought or waterlogging should be prevented after flowering.
5. Pruning and picking In winter, properly prune the plants to inhibit the growth of branches and promote the differentiation of flower buds. During the growing period, long branches, excessively dense branches, weak branches and excessively strong branches should be pruned in time. 7 to 10 days before flowering and after the plant has set fruit, the over-growing branches can be picked and the terminal buds removed.
6. Girdling branches 5 or 6 days before flowering, ring-cutting branches or plants that are growing vigorously should be carried out, and girdling should be carried out 3 centimeters below the ear of the fruiting branch near the branch.
7. Thinning flowers requires timely pruning of grape inflorescences, that is, flower ears with single branches or multiple branches. Wait until the branches grow to 8 to 10 centimeters. The inflorescences should be retained for strong branches, and the inflorescences should not be retained for weak branches. Two inflorescences are retained on one strong branch, and one inflorescence is retained on branches except weak branches. Strong branches with large ears can be pinched 5 to 7 days before flowering. For the remaining inflorescences, the weak ears and secondary ears should be removed, and then 1/5 to 1/4 of the length of the top of the inflorescences should be pinched.
8. The fixed tip should be bound on the new tip that has just grown. The new tip should be pulled every ten centimeters and tied evenly to the frame surface. The angle of pulling the branch should be determined according to the flexibility of the branches.
9. Pest and insect pest control The main diseases that are prone to occur in grape flowering are gray mold and cob brown blight. Spray spraying must be carried out before flowering to prevent it, especially during periods of continuous rainfall.
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