Based on these reasons for the formation of large and small grains, Qingjianghe has proposed prevention and control methods for grape large and small grains for reference: Prevention and control measures 1: Varieties with poor pollination that produce large and small grains can be for denuclearization.

Kyoho, Victoria and Jingya grape varieties all have the biological characteristic of poor pollination resulting in large and small grains. However, after seedless treatment, there are no seeds in the grape berries, and the grape berries will be uniform in size. Prevention and control measure two: before and after the flowering period of grapes, combine the prevention and control of various pests and diseases with appropriate proportions of amino acids or humic acid foliar fertilizers containing high phosphorus, potassium, zinc, and boron to timely supplement the large, medium, and micronutrients missing during the grape growth process.

Spray borax (fertilizer) or zinc fertilizer during the inflorescence separation period, or a multi-nutrient foliar fertilizer based on phosphorus, potassium and calcium. Spray 1,500 to 2,000 times liquid spray once or twice. You can get good results. Prevention and control measure three: When encountering extreme weather during the flowering period, watering the vineyard can alleviate the impact of adverse weather on grape growth. In the young ear stage after flowering, the fruit ears can be treated by spraying or soaking them.

The processing time for young ears is within five to fifteen days of flowering. The treated young ears will retain some of the dead fruits and some of the small fruits. After treatment, it should be cleaned and pruned promptly. In this way, the mature fruit ears are compact and mature without any "blossom bunching" phenomenon. Prevention and control measure four: Reasonably pruning and reasonable loads.

Grape grains are prone to appear in old age or when the vegetative growth is too strong. The vegetative growth of the vigorously growing grape branches in the current year is greater than the reproductive growth, and poor flower bud differentiation will reduce the fruit production rate in the second year. In addition, too much remaining fruit and too large a load will cause large and small grains. Therefore, the determination of pruning and loading is an important manual measure to artificially adjust the size of grains, and neither can be neglected. Prevention and control measure five: Scientific management and control of tree vigor.

Grapevines with excessive vegetative growth should be properly controlled. For grapevines with weakened vigor, it is necessary to supplement nutrients from the leaves, and then fertilize the grapevines with water after the vigor is restored. Avoid the phenomenon of large and small grapes caused by too strong or too weak trees.