How should grape downy mildew be prevented?

Grape downy mildew mainly harms the leaves of grapes, and then infects young plants such as young shoots. So, how should grape downy mildew be controlled?

1. The leaves are damaged, and the small spots with unclear edges of the primary yellowish water-stained spots gradually expand into brown irregular or polygonal lesions, and the spots are connected to become irregular large spots. When the weather is wet, white frosty mildew is formed on the back of the lesion, which is the cyst of the pathogen and the sporangia. When the disease is serious, the diseased leaves are early and early. 2. The young shoots are damaged, forming water-stained spots, which turn into brown-stained lesions. When wet, the lesions also produce white downy mildew. When the disease is heavy, the new shoots are twisted, the growth stops, and even die. The tendrils, cobs, and petioles can sometimes be killed, and their symptoms are similar to those of young shoots. 3. The young fruit is murdered, the diseased part fades, hardens and sinks, and the white frosty mildew is easy to shrink and fall off. When the fruit is half-sized, it is damaged. The diseased part is brown to dark, and the soft rot is early. After the fruit is colored, it will no longer infect

1. Remove the source of bacteria, thoroughly clean the orchard in autumn, cut off the diseased shoots, collect the diseased leaves, concentrate deep or burn. Deep ploughing in autumn and winter, and spraying a 3-5 degree sulphur sulphur mixture on the ground in the plant or nearby ground, can kill the overwintering bacteria source in large quantities and reduce the source of infection at the beginning of the year.

2, strengthen the management of the orchard, timely summer shears, shackle the branches and vines, improve the ventilation and light transmission conditions of the frame. Pay attention to weeding, drainage, and reduce the humidity on the ground. Adding P and K appropriately, liming acidic soils, improved disease resistance plant

3, grape downy mildew agent control 1 grape display leaves after the application of 1: 1: 120 Bordeaux liquid protective fungicide to prevent the infection and breeding of pathogenic bacteria.

2 Inflorescences from the beginning to the flowering stage with 53% Jinleiduomeergan Mn 600-800 times solution to control downy mildew;

3 Immediately in the early stage of the disease, the drug can be sprayed with 50% toxic manganese zinc (600 times solution), 72% chlorothalonil WP (700 times solution), and 58% metalaxyl manganese zinc (500 times solution).

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Other Door Accessories

Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.

Detail introduction for above main accessories

1.Motor and controller:

The garage door operator is designed for residential overhead sectional and tilt doors.

The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.

Rolling code remote control with max. 20 pcs hand transmitters.

The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.

The controller has a security LOCK function which prevents operation of the door from transmitter.

2.spring break device:

Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.

Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.

3.able break device:

cable break device ,door hardware

adjustable bottom bracket .

the raw material hot plate

zinc plated

safety device

adjustable bottom bracket

the raw material hot plate

zinc plating

spring safety device ,2" and 3" safety device

once the cable is broken ,this devoice can keep the hurt away from the door falling

4.aluminum alloy rope pulley

Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting

machine, 5~250 tons punching machines, welding machine, polish machines...

Processed material: stainless steel: copper, carbon steel

Surface treatment: Hot galvanized, polishing

Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,

welding, tapping, riveting, grinding

5.air bag system

It is a safety device. When the door is down to hit something, it will up automatically.

Operation pressure:<3mbar

Battery:CR2032*2

Battery lifetime>1 year

Emission frequency: 315MHZ

Emission power:<10mW

Receiver power source:12V

6.duplex enhanced guide wheel bracket

Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.

Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector

Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.spiralfastdoor.com