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A Complete Collection of Garlic Diseases and Its Control
The whole picture of garlic disease and its control methods are as follows:

1, garlic leaf blight

Garlic leaf blight is yellow at the tip of the leaf, with streaks running through the whole leaf, developing along the midrib of the leaf or on one side of the leaf, and the diseased spot becomes grayish yellow or grayish brown after expansion. When the air humidity is high, the surface of the lesion is densely covered with dark brown mold. Viral diseases are characterized by obvious mosaic of leaves, sometimes chlorosis or yellow stripes, twisted leaves, yellowing of tip, etc.

Prevention and control methods: strengthen cultivation management, cultivate robust plants and enhance disease resistance. Strengthen field drainage, reduce field humidity, control the disease, avoid damaging leaves, reduce wounds and avoid spreading diseases artificially in the field.

Spraying 500- 1000 times of 20% virus A2 wettable powder or 1000 times of 1.5% plant protection emulsifiable concentrate at the initial stage of the disease to prevent virus diseases. Choose 800- 1000 times of 50% chlorpheniramine wettable powder or 800 times of 50% chlorpheniramine wettable powder and 500 times of 70% mancozeb wettable powder to control garlic leaf blight.

2. Bacterial soft rot

After garlic infection, yellow and white stripes are formed along the leaf margin or midvein, which can run through the whole leaf. When the humidity is high, the affected part is yellowish brown and soft rot. Generally, the foot leaves first get sick, and then gradually spread to the upper leaves, causing the whole plant to wither or die.

Prevention and treatment: spraying hymexazol, copper complex amine and Bacillus subtilis when the disease occurs.

3. Sclerotinia sclerotiorum of garlic

The diseased part is located under the membrane at the base of garlic pseudostem. At first, the diseased spots were stained with water, then turned black and gray, and the ulcer rotted, and the rotten part gave off a strong garlic smell. After the leaf sheath of garlic rotted, the upper leaves wilted, gradually turned yellow and died, and the roots of garlic rotted and scattered.

Prevention and treatment: Fungicides such as mycophenolate mofetil, iprodione, cyprodinil and boscalid can be sprayed for prevention and treatment.

4. Phytophthora root rot

This pathogen mainly harms the roots and bulbs of garlic. At the beginning of the disease, the roots gradually turn brown and rot, and after the bulbs are cut open, the bulbs near the root disc turn brown. The leaves of infected plants gradually turn yellow from bottom to top, dry and die, the plants are obviously dwarfed, the garlic bolting is short or not bolting, and the seriously infected plants cannot form yield or die.

Prevention and control methods: After the onset, it can be prevented by spraying copper complex, Bacillus subtilis and hymexazol.

5. Onion flies

Larval worms eat garlic bulbs, which leads to rot, yellow leaves, withering and even death in pieces.

Control methods: mainly through soil treatment before sowing, seed dressing with chemicals, spraying at the initial stage of occurrence, etc. The effective agents are phoxim and chlorpyrifos.