Control methods of common grape diseases in summer

The midsummer season is just in August, with alternating hot and cold climate and more rain. For grape planting management, it is easy to be infected with various diseases, such as downy mildew and so on.

These diseases usually seriously affect the yield and quality of grapes, so special attention should be paid to the prevention and management of diseases in summer.

Let's take a look at the prevention and treatment methods of common diseases of grapes in summer.

1, downy mildew

Main symptoms: Downy mildew is a fungal disease, which only harms grapes, mainly leaves, branches and buds of grapes.

Its symptoms are irregular yellowish translucent oily spots on the front of leaves; Oil-soaked spots also appeared on the tender shoots, with yellow-white mildew spots on the surface; In the early stage of young fruit disease, the diseased part turns pale green.

Prevention and cure method

(1) Strengthen orchard management, at the same time, carry out reasonable pruning, remove diseased leaves and fruits in late autumn, cut off diseased branches and reduce bacterial sources.

In addition, phosphorus, potassium and calcium fertilizer were added to improve the disease resistance of plants and reduce the chance of bacterial infection.

②72% metalaxyl 600 times solution or 18% anke 1000 times solution has good control effect on grape downy mildew.

2. Brown spot disease

Main symptoms: brown spot disease mainly harms grape leaves, which can be divided into big brown spot and small brown spot according to the size of the disease spot and different pathogens.

Usually, the big brown spot is nearly round, with a diameter of 3- 10 mm, a dark brown ring pattern in the center, and a small brown spot with a diameter of 2-3 mm. When the size is uniform, dark brown mildew spots are produced on the back of the diseased spots in the later stage.

Prevention and cure method

① spray 1: 0.7: 200 times bordeaux solution, 80% spray or 800 times Sheng Da M-45 wettable powder, and 5% bacterial toxin aqueous solution 1000 times solution.

Spraying once every 10- 15 days for 2-3 times continuously has a good control effect.

(2) Thoroughly clean the fallen leaves after autumn, reduce the overwintering bacteria source, increase the application of organic activated nutrition in the growth period, and enhance the tree vigor.

At the same time, drainage and humidity reduction can reduce the incidence of the disease.

3. Sunburn

Main symptoms: It usually occurs in the fruit ear coloring maturity, and mostly occurs when the fruit ear is exposed to sunlight, which is caused by insufficient water supply for the fruit.

When the fruit is sunburned, the surface of the fruit is light brown, nearly round and the edge is not obvious. The surface of the fruit shrinks first and then sinks gradually, and the serious ear becomes dried fruit.

Prevention and control methods:

(1) Reduce the groundwater level, especially in low-lying areas, and pay more attention to timely drainage after rain.

Rational fertilization, a large number of organic fertilizers, etc.

② Bagging berries in front of the hard core to prevent direct sunlight.

4. Black rot

Main symptoms: it mainly harms the fruits, leaves and other parts of grapes. Its symptoms are as follows: reddish-brown near-circular spots appear between veins when leaves are infected; Mature fruit is infected with disease, and it is purple-brown with small spots at first, and the center is slightly gray.

Prevention and control methods:

(1) cut off diseased ears and diseased shoots, clean up fallen fruits, diseased fruits and diseased leaves, and burn them centrally to reduce the source of germs.

② Special agents such as 600-800 times of 50% carbendazim wettable powder, 600-800 times of 75% chlorothalonil wettable powder or 20% trifloxystrobin water dispersible granule 1000-2000 times can be used for control.

In addition to the above diseases, there are some common diseases such as black pox and anthrax, which are also the focus of prevention and control during the summer vacation. Generally speaking, summer vacation is a special period and a sign of the end of high temperature in summer. It is necessary to do a good job in the prevention and control of related diseases in combination with climate characteristics, so as to effectively ensure the yield of grape planting in the later period.

So much for the prevention and control of grape diseases. Welcome to read other agricultural contents of Qinggua.com.

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