Can it be watered when the weather is hot during the expansion period of grape fruit?

The weather is too hot to water during grape expansion period, and the management of grape expansion period

When the rainy season came in June, the grapes had reached the fruit expansion stage. Therefore, proper control of vegetative growth, promotion of flower bud differentiation and prevention of diseases in rainy season are the key points of recent management, and the following measures are suggested:

First, strengthen fertilizer and water management.

At the end of bagging, it is also a critical period for fruit expansion and flower bud differentiation. In addition to a lot of nutrients needed for the growth of young fruits and new shoots, it also faces flower bud differentiation and needs a lot of fertilizers. If it is not supplemented in time, it will affect growth and cause premature aging. At present, 45% compound fertilizer with high nitrogen and low phosphorus and medium potassium ratio 100- 120kg/ mu, 500g/ mu of beneficial microbial inoculum or 20 kg +2 kg of second-generation prebiotic bacterial fertilizer of corn flour can be applied, and then 45% compound fertilizer with low nitrogen, medium phosphorus and high potassium can be applied in late July. For varieties that are easy to crack fruit, applying 500 grams of loosening soil essence per mu before watering after fertilization can effectively alleviate soil water accumulation, improve soil hardening and improve the utilization rate of chemical fertilizer.

Fertilization method: 50 cm-60 cm away from the grape trunk, point application or furrow application, with a depth of 20-30 cm. Then water it once.

In order to ensure the quality of grapes, irrigation should be strictly controlled within one month before harvesting to prevent the sugar content from decreasing. Pay special attention to drainage and flood control before the rainstorm.

Second, disease control.

Grapes mainly control downy mildew, anthracnose, white rot and brown spot from fruit expansion to maturity. How to use medicine depends on the weather.

Downy mildew should be a frequent disease, about 28 degrees, the temperature and humidity will be slightly higher. Spraying Antaisheng 600 times before or at the beginning of the disease can prevent brown spot, anthracnose and white rot at the same time. The middle and late stage of the disease can be treated with 600 times Yinfali suspension, and the drug holding period can be as long as 10 day.

White rot and anthracnose are easy to occur under high temperature and high humidity, and the preventive agent can refer to the prevention and treatment of downy mildew; After the onset, it can be prevented and treated with 3000-fold solution of 43% Hollick suspension or 3000-6000-fold solution of 75% ground water dispersible granules.

Brown spot disease can be used in combination with the above two drugs, the preventive drug can refer to the prevention and control of downy mildew, and the therapeutic drug can refer to the prevention and control of white rot.

In rainy season, adhere to the principle of combining therapeutic agent with protective agent, treat white rot, anthracnose and downy mildew in turn, and take medicine once every 10- 15 days, and master the broad-spectrum protective agent (such as 800 times of Antaisheng or 600 times of thiram) and therapeutic agent 1 dose (such as 3000 times of diazepam) to prevent downy mildew. The occurrence of downy mildew can be treated with 600 times silver mana or 600 times mycophenolate mofetil, and then protective agent can be used.

Spraying Antaisheng 600 times+Hollick 3000 times+Biot 2000 times+Ruipeile 3000 times in the middle and late June.

After fifteen days, spray diazepam 3000 times+ciba potassium dihydrogen 65438 times+Yiwei 0000 times +0000 times twice.

If root rot occurs and the growth is slow: in late June, using 200ml+ Shiruimiaoqing+Ruimiaoqing partner every day for 10- 15 days can play a dual role of medicine and fertilizer, effectively prevent root rot, promote root swelling, increase fruit powder and improve quality.

3. Treatment of branches and vines

With the accelerated growth of new shoots, the summer buds of new shoots gradually developed into secondary buds from top to bottom. If not controlled, it will not only cause shade on the shelf surface, affect ventilation and light transmission, but also waste tree nutrients. It is required that all branches below 30 cm from the ground should be leveled, and the specific operation above 30 cm should be determined according to the actual situation, and the old leaves at the base should be removed in time.

For all new shoots and extended branches, it is required to pick the core before the end of July, because late leaves are invalid. Picking seeds early is beneficial to nutrient accumulation, promoting flower bud differentiation and laying a good foundation for next year's fruit.