1 symptoms
The grape downy mildew pathogen mainly damages the leaves and can also damage young tissues such as fruit, new slightly, tendrils, petioles, inflorescence, cobs, and pedicels. The affected leaves first appeared semi-transparent, oily spots with unclear edges, and later gradually expanded into tan-colored, polygonal lesions, and could connect to each other to form large lesions. When wet, a white moldy layer appears on the back of the leaf, the lesions eventually become brown and dry, and the leaves fall early. Young shoots, tendrils, and cobs began to appear as oily, semi-transparent spots, which later turned into slightly yellowish-brown spots. When wet, white molds appeared on the surface. Branches suffer damage, stagnation, distortion, and even death. The flower and young fruit are dark brown in color and produce a white layer of frosty mildew that soon shrinks and falls off. When the fruit grows to a large pea size, it is diseased, initially showing a reddish-brown spot and later becoming rigidly cracked.
2. Control technology
(1) Do a good job of chemical control in time
Preventive agents: 77% copper sulphate WP 500 to 600 times solution or 53.8% copper sulphate water dispersible granules 600 to 800 times liquid and other agents, once every 10 to 15 days, even against 1 to 2 times. .
Early onset: 50% dimethomorph water dispersible granules 1000 to 1500 times or 18% carbazolone suspension 1500 to 2000 times or 50% metalaxyl WP 500 to 600 times or 72.2% of promehyaldione hydrochloride 1500-2000 times solution or 94% of cream urea cyanogen drug 1500-2000 times solution or 23.4% of dicynylammonil suspension agent 1000-2000 times solution and other agents, once every 10 to 15 days, Even against 2 to 3 times.
Severe onset: 60% cymoxime aureus 1200 times or 18% carbazide sulfonamide suspension 1500 to 2000 times or 68.75% fluopoxam against prodrazine Weisui hydrochloride 600 times or 40% olefin Cyclomethacazol 2000 times liquid and other agents, once every 7 to 10 days, even against 2 or 3 times.
After bagging and harvesting: half-volume Bordeaux mixture 200 times solution or 50% dimethomorph water dispersible granules 1000-1500 times solution or 80% EDP WP 500-600 times, etc., every 15 to 20 Once a day, even defense 2 to 3 times.
Spray precautions: When spraying, be sure to re-spray the back of the blade, so that the leaves on the back of the drug evenly.
(2) Ears bagging at the right time
Bagging is the best way to prevent grapevine downy mildew. Grapes should be bagged when they enter the hard core.
(3) Promote rain protection technology
The rain protection technology can effectively control the occurrence of downy mildew, has better control effect on acid rot, anthrax, gray mold and brown spot, and can reduce the grape's rotten fruit in the later period.
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