The jujube "black spot" is something
Before and after each jujube fruit coloring period, there are always asked the jujube farmers, there are black spots on the dates is how it happened, why not early onset, jujube fast red got sick?
Before and after the coloring period, black lesions appear on the jujube fruit, usually brown spot disease, which is an increasingly serious disease in recent years. The disease mainly infects jujube fruit, causing fruit rot and early fall off, generally in August and September when the jujube fruit enlarge, white, will be a large number of disease when coloring. Infested fruits appear dark brown spots, and gradually expand into oval lesions, soft flesh rot, severe fruit soft rot, fruit easily fall off.
The brown spot pathogens mainly overwintered on diseased fruit and dead branches, and the spores of the disease were attacked by wind and rain. The leaves can suffer from flowering before flowering, especially with young leaves and yellow leaves. The fruit began to infect after falling from the end of June, but it did not develop the disease. The pathogenic bacteria invaded was in a latent condition until the fruit was gradually mature.
The incidence of the disease sooner or later, severity, and rainfall conditions and environmental humidity are closely related. In years of heavy rainy weather, the jujube gardens with weak trees and closed canopies occur early and heavy, especially from mid-August to early September, when continuous rainy days occur, diseases will occur.
The key to prevention and control of brown spot disease is to strengthen the cultivation and management, to improve the orchard health, and the focus of chemical control is prevention.
1. Do a good job of orchard hygiene. Timely removal of dead fruits in the bare land, the pruning of the jujube garden combined with pruning to remove dead branches, diseased shoots, and burning, to reduce the source of the disease.
2. Strengthen cultivation management. Increase organic fertilizers, increase tree vigor, and increase tree disease resistance. Strengthen pruning, enhance the ability of Zaoyuan ventilation.
3. Chemical control. First, pre-emergence prevention. About half a minute before germination, 3 to 5 Baume degree lime sulfur was sprayed, 400 to 600 times liquid 30% carbazole (Fulian) suspension agent, 300 to 400 times liquid 77% copper sulfate calcium (Donning) Wet powder or 100 times liquid 40% Formamide arsenic wettable powder. Second, the young fruit period after flowering began to control. It usually starts spraying about half a month after flowering, and sprays once every 10 to 15 days, even spraying four times. There are 30% effective mitoxazole carbendazim (Fulian) suspension 1000-1200 times, 70% thiophanate-methyl (thiophanate-methyl) wettable powder 1000-1200 times, 500 grams / liter methyl Suspension of thiophanate-methyl (thiophanate-methyl) 1000 to 1200-fold, 500-gram per liter of carbendazim (Tongwang) Suspension 1000 to 1200-fold, 80% Mancozeb (Taisheng) WP 800 ~ 1000 times liquid, 77% copper sulfate calcium (Donning) wettable powder 600 ~ 800 times liquid, 60% copper calcium carbendazim (Jianjia) wettable powder 600 ~ 800 times liquid, 10% difenoconazole Water-dispersible granules are 2000 to 2500 times, 1:2 to 3:200 to 240 times Bordeaux and the like.
Note that in the prevention and treatment process, drugs should be used alternately. Do not use only one agent. At the same time, protective agents and therapeutic agents should also be used alternately to improve the control effect.
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