Control measures for grey mold of leek

2024-10-25 18:00:18
Recently, many farmers have reported that Huang had begun to go public, but it was very bad when it was harvested. According to the description, it is a common cause of gray mold of Chinese leeks in the cultivation of yellow leeks in winter.

Botrytis mainly damages the leaves. The disease started from the tip of the leaf and developed downwards, causing the upper half or even the whole leaf to dry. Initially scattered white to grayish-brown small spots on the front or back of the leaves, expanding to elliptical to spindle shape, size of 2 to 7 mm. When the humidity is high, sparse brown-brown moldy layer grows on the lesions, and is connected to pieces later, to the first half of the leaf or the whole leaf scorch. After leeks or leeks are harvested, they often rot down from the knife's mouth and form "V" shaped spots. The old leaves that are closer to the ground are prone to soft rot due to high humidity and weak growth.

Botrytis cinerea is caused by fungus Botrytis cinerea. The bacteria lived in the soil with mycelium, conidia and sclerotia. It was determined that the survival rate of bacteria in the soil after 21 months was 79%. The bacteria was a weak parasite, and the conidia and conidial stalks spread through the air stream and could only invade from the wound and the orifice. The hole is mainly the tip of the water hole, the wound is caused by human wounds. When the temperature is 15 to 21°C and the humidity is more than 80%, brownish-brown molds appear in the diseased part, and the field germs invade with the airflow and rainwater in the agricultural operation. In the greenhouse cultivation and when pressing yellow, because cutting vegetables often cause wounds, when the humidity is high, pathogens infect from the wound, resulting in increased disease. General poor drainage, high planting density, partial application of nitrogen fertilizer, when light is insufficient, the incidence is heavier.

Prevention and cure: 1. Crops with severe incidence of gray mold should be used for more than two years in rotation with non-lilytical vegetables; organic fertilizers should be applied to the leeks to timely weeding and top dressing; irrigation should be controlled at the onset of disease, and the diseased bodies should be removed. 2.Before earthworms are cultivated or before weeding, we must pay attention to strengthening ventilation and spraying pesticides. Available 6.5% polymycetin Wei dust agent one kilogram per mu, or 10% procymidone smoke agent 260 ~ 300g per mu, scattered lit smoke overnight. If it is exposed to the ground, it should use 6.5% pyrethroid WP 0.5 times or 50% iprodione WP 1000 to 1600 times spray, spray once every 7 days, use 2 times. 3. The already affected fields can be sprayed with the following agents: 50% fast-inking WP 1500-2000 times, 50% acetaminophen WP 1000-fold, 50% WAN WP 10000-fold, 50% Polymyxin WP can be 600 to 800 times, and 25% azoxystrobin (Amisida) suspension 1500 times. The above medicines are used alternately every 7 days.

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