How to manage early summer grapes

In early summer, the promoted cultivation grapes are in the young fruit stage, the rain-proof cultivation grapes will enter the initial flowering stage, and the open-field cultivation grapes are still in the inflorescence differentiation stage. The current grape management should pay attention to the following matters:

1. Promote the cultivation of grapes 1. Strengthen the ventilation of the greenhouse and control the temperature and humidity in the greenhouse. The shed door should be opened around noon and the skirt should be lifted to reduce the humidity and the temperature on cloudy days. Due to the large changes in temperature at present, heat preservation should be done at night.

2. Fixed shoots and fixed yield: According to the variety, tree vigor and yield requirements, generally 2200-2500 shoots per mu are reserved. The yield per mu is about 750-1000 kg.

3. Top dressing: Top dressing and watering quickly after the fruit is set. Keep the soil moist during the young fruit swelling period.

4. Continue to handle the vice shoots and pay attention to the prevention and treatment of powdery mildew.

2. Cultivation of grapes in open field and sheltered from rain 1. Tree body management: main shoot topping: 5-7 days before the first flowering for the vigorous trees, and 5-7 days before the first flowering for the trees with moderate or weak vigor, and 5 for the first inflorescence. -7 leaves topping. Auxiliary shoot treatment: erase below the inflorescence, treat the single leaves above the inflorescence after extinction, leave 1~2 auxiliary shoots in the topping mouth. Whole ear: the whole ear takes about a week before. After the whole ear, Kyoho and other varieties generally retain 13-15 branch ears, and Xia Hei can only leave 3-5 cm from the tip of the ear.

2. Soil moisture and fertilizer management: use fine weather to step up site preparation and weeding, clean up and deepen the trench system, and prevent heavy rain and water accumulation. If the soil in the field during the rapid growth of the new shoots is dry, water can be watered once; spray the excellent boron 1000 times before the flower to promote fruit setting.

3. Prevention and control of pests and diseases Before and after flowering, focus on the prevention and control of pests and diseases, mainly gray mold. Method: 50% boscalid water dispersible granules (Kaiser) 1500-2000 times or 40% pyrimethanil suspension (Scarlet) 1000-1500 times can be used, and it can be mixed with imidacloprid or pyrethroids for control. Insect agent also treats piercing and sucking mouthparts pests such as A. lucorum and aphids.

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