Master the occurrence rules and control techniques of grape powdery mildew

With the rapid expansion of the scale of grape planting, it provides conditions for the spread of powdery mildew, and the harm of grape powdery mildew is also increasing, which seriously affects the growth and development of grape plants and the improvement of grape quality. The occurrence rules, occurrence conditions and comprehensive prevention and control of grape powdery mildew, the following details:

1, grape powdery mildew symptoms

The disease mainly affects the leaves, branches and fruits, and is most sensitive to young tissues. The loss of fruit damage is greatest. The leaves are damaged, and a layer of gray-white powdery mildew is formed on the surface of the leaves, which gradually spreads to the entire blade. In severe cases, the diseased leaves are curled and withered. The new vines are damaged, initially showing grayish white spots, and then spread and spread to make the whole vines disease. The diseased vines turn from grayish white to dark gray, and finally black; the fruit is damaged. First, a layer of gray-white powdery mildew is formed on the surface of the fruit, and the white powder is wiped off. The epidermis has a brown pattern, and finally the epidermal cells become dark brown, and the damaged young fruit is prone to cracking. Leaf damage: A layer of gray-white powdery mildew is formed on the surface of the leaf, which gradually spreads to the whole leaf. In severe cases, the diseased leaf curls and withers. The new vines are damaged, and initially appear grayish white spots, and then spread and spread to make the whole vines sick. The diseased vines turn from grayish white to dark gray, and finally black.

2, the occurrence of grape powdery mildew

2.1 grape leaf powdery mildew

In the early stage of the disease, in mid-April, the growth period is in the flowering stage, the diseased leaf rate is 2.00%, and the disease index is 0.22. There are two stages in the peak period. One is from mid-May to early June, and the growth period is from young fruit to coloring. The peak incidence period is May 26, the growth period is in the hard core period, the diseased leaf rate is 16.00%, and the disease index is 4.28. The second is from the end of August to the beginning of October, the growth period is in the aging period of the branches, the diseased leaf rate is 18.00%, and the disease index is 3.46.

2.2 grape ear powdery mildew

In the early stage of the onset of the disease, the growth period is in the young fruit stage, the disease rate is 10.00%, the disease index is 0.11, and the disease rate is 0.87%. The late onset period from late May to early July, the growth period is in the hard core period to May to June. At maturity, the peak incidence period is in late July, and the growth period is at the maturity stage of fruit granules. The diseased ear rate is 40%, the disease index is 8.68, and the disease granulocyte rate is 13.46%. After July 10, the disease index did not increase, and the disease rate did not increase after July 22.

2.3 The occurrence of grape powdery mildew

According to the survey results, the grape leaf powdery mildew disease in early April, the initial flowering period began to appear, there are two episodes of the disease, the first is from mid-May to late June, the growth period is from the young fruit period to 50% maturity The second is from mid-August to mid-September, the growth period is from the harvest period to the senescence period of the branches; the powdery mildew of the grape ear begins to develop in the middle of April, and the young fruit is from mid-May to early July. The maturity period is up to 60%.

3. Harmfulness and pathogenic conditions of grape powdery mildew

3.1 The occurrence of grape powdery mildew

According to the survey results, grape powdery mildew infects all green young and tender tissues, young leaves, new shoots and young fruit are susceptible to disease, and old mature leaves and fruits rarely appear after coloration. Diseases can affect grape growth and fruit development, resulting in reduced yield, poor quality, and reduced cold resistance of plants.

3.2 Incidence conditions

3.2.1 Climatic conditions The occurrence of grape powdery mildew is closely related to rainfall. If the rain comes early, the disease will be delayed, and the rainy season will be early, the precipitation will be more, and the incidence will be lighter. After entering the rainy season, the air humidity is low and the disease is light, which is a drought-tolerant disease. Therefore, the growing area of ​​grape growing season is conducive to the occurrence and prevalence of powdery mildew; for grape growing areas such as rainwater, in the dry year, the chances of occurrence and popularity of powdery mildew are large; in areas with heavy rain during the growing season, white powder The chance of a disease is small. Drought or dry or wet after rain or drought is conducive to the prevalence of powdery mildew.

3.2.2 Cultivation management Cultivation management is closely related to the severity of powdery mildew. For example, high planting density, long leaves and poor ventilation and light transmission conditions are favorable for the disease, partial nitrogen application, low soil organic matter content and tree recession are favorable for the disease. The arid vineyards are heavily ill.

4. Comprehensive prevention and control technology of grape powdery mildew

4.1 timely Qingyuan

After harvesting in autumn, clear the garden in time, thoroughly remove the fallen leaves, diseased branches, diseased fruits, etc. in the orchard and spray the stone sulfur mixture; in the growing season, timely remove the diseased leaves, diseased fruit, bring out the orchard to burn; spring grape sap Spray the stone sulphur mixture during the flow; in the growing season, remove the diseased leaves, diseased fruits, and diseased tips in time.

4.2 Strengthening cultivation management

Apply organic fertilizer in the field, increase the application of phosphorus and potassium fertilizer, strictly control the use of nitrogen fertilizer, improve the disease resistance of the tree; scientifically use the pruning technology to prevent powdery mildew in the growing season, and leave the branches reasonably to keep the orchard ventilated; Arid orchards are flooded in time.

4.3 Scientific use of chemical control

Pay attention to the prevention in the early stage, the focus is to grasp the 2-3 times in the clearing garden, and spray the stone sulphur mixture once after the fruit picking, after the trimming, and during the germination period. In the early stage of the disease, use 50% sulfur suspension agent 300-500 times liquid or ether fungus ester water dispersing agent 3000-4000 times liquid or 12.5% ​​oxazolol water-dispersing granule 2000-2500 times liquid or 20% difenoconazole water dispersion. The granules are treated with 4000 to 5000 times of liquid and other chemicals, once every 10 to 15 days, and even 3 to 4 times.

Automatic Zebra Roller Blinds

Motorized zebra roller shades is in one roller blinds with sheer shades .  Various Horizontal Slat of Solid fabric curtain with alternating sheer is on the same plane,  beccoming a zebra roller blinds while double plane of shades that the slat of opaque fabric of two plane overlaps alternately, and operating like tranditional window roller blinds. While Electric zebra curtain shades moves up or down, you can stop at any position whatever you like for view outdoor, light control or more privacy.   

Tubular Motor

Zebra blind shades offer different slat size, and different patterns to be overlap seamlessly, Both light filtering sheer blind and room darkening opacities shade is available , there are numerous textures and colours fabric to choose from.  Remote control Zebra roller shade are perfect for covering large widows, smooth, precise operating is easy to raise for big windows. banded roller shades is Durable and versatility, whether the nature diffusion 

Motorized Electric Zebra Roller Shades

View Through Banded Roller Shades,Motorized Zebra Roller Blinds,Filting Light Zebra Roller Blinds,Soft Yarn Motorized Blinds

Shenzhen Yuaneng Industrial Co.,Ltd , https://www.bi-colour.com

Posted on