Grape Management Methods in June

In June, both grapes grown outdoors and in greenhouses usher in their golden period of growth. Vineyard management requires special attention during this critical month. Let’s learn about grape management methods in June.

1. Side shoot treatment

Pinch the grape branches, leaving 5 to 8 leaves above the flower spike, and prune again with 3 leaves on the top side shoots. The treatment of the middle and lower lateral shoots varies according to the different grape varieties. For example, the Red Globe and Beauty Finger varieties retain 3 leaves, while the Victoria and Ruby Seedless varieties retain 1 leaf.

2. Fruit enlargement treatment

In order to improve the fruit setting rate and fruit quality, most varieties will undergo flower and fruit preservation treatment, usually in mid-to-late May. Seed development may be inhibited during the fruit preservation process, so artificial gibberellin supplementation is needed to promote fruit enlargement. The best time to process is 20 to 25 days after flowering, which is about 14 days after fruiting.

3. Fruit thinning

After the expansion treatment, fruit thinning is required to ensure a reasonable load on the fruit clusters and avoid problems such as excessively large fruit clusters and small fruit grains due to inadequate fruit thinning, which affects the commercial quality of the fruit. The degree of fruit thinning should be determined according to the characteristics of the variety. It is generally recommended to retain 50 to 80 fruits.

4. Fruit bunch bagging

Bagging in June is crucial and should be done immediately after fruit set is stable, bunch shaping and fruit thinning are completed to avoid the adverse effects of the rainy season. Choose suitable fruit bags, such as fruit bags with light base paper, high transparency, good air permeability and moisture permeability. When bagging, avoid high temperature periods to prevent damage to the fruit.

5. Application of fruit enlargement fertilizer

In mid-June, after the fruit hardens and before it colors, apply fruit enlargement fertilizer in time, mainly phosphorus and potassium fertilizers, combined with organic fertilizers or compound fertilizers , and avoid using urea nitrogen fertilizers. Adjust the amount and type of fertilizer according to the actual situation of the vineyard.

6. Pest and disease control

During the rainy season in June, grapes are susceptible to a variety of diseases, especially anthracnose and white rot. The pesticide should be applied immediately when the leaves are dry after rain. If it rains after application, it needs to be sprayed again. Vineyards cultivated in the open field should focus on the prevention and control of downy mildew, while vineyards cultivated in rain shelter have fewer diseases and can be prevented by using methyl thiophanate and dasheng.

7. Garden soil and water management

Ensure that the field ditches are unobstructed to avoid water accumulation; remove weeds in time to maintain a normal growth environment for plants.

In short, meticulous management measures can ensure that grapes receive adequate nutrition and a good growth environment during their peak growth period, thereby increasing grape yield and quality.