Chinese cabbage black spot disease is a fungal disease. The rounded lesions of 2-10 mm in diameter appear on the leaves of the Chinese cabbage. The lesions are brown or light brown, and there are halos outside. There are obvious concentric patterns on the leaves. When the humidity is high, there is a black mold (as a pathogen) on the lesion on the back of the leaf, and the other cabbage can be harmed by the airflow; when the disease is heavy, the lesions on the leaf can be connected to each other, so that the leaves of the diseased plant are from the outside to the inside. Yellowing and death often cause large economic losses. The main control measures are as follows.
1 Seed treatment: The pathogen of black spot disease can be attached to the Chinese cabbage seeds and directly infect the seedlings. Therefore, before the Chinese cabbage is planted, it can be seeded with 50% Fumei double wettable powder with a seed weight of 0.4%, or 50% of the hydantoin wettable powder with a seed weight of 0.2%-0.3%.
2 Control field humidity: In the easy onset period, the field is humid and the incidence is heavy. 1 suitable for seedlings. According to the characteristics of Chinese cabbage, soil fertility and other factors, appropriate plant spacing should be used in the appropriate period (Taiyuan area can not be later than in early September) to improve the field ventilation conditions. 2 Reasonable watering. In the easy onset period, it is necessary to look at the sky, see the ground, see the growth of Chinese cabbage, and timely watering according to the amount of water, should avoid the rainy days after watering. Water in the field should be discharged early.
3 Early spraying: After the black spot disease pathogen invades the leaves of Chinese cabbage, the disease spots can be formed after 3-5 days, and the black mold can be produced on the lesions, and then the Chinese cabbage is invaded. Therefore, when the lesion appears on the lower leaves of Chinese cabbage, it can be sprayed, and 75% chlorothalonil wettable powder 600 times solution, or 50% chlorhexidine WP 1500 times solution, or 50% Fumei double can be used. Wettable powder 500 times solution, or 64% anti-virus hydrazine powder 500 times solution, spray once every 7-10 days, even spray 3-5 times, 50 kg per spray solution per 667 square meters.
4 Foliar fertilizer: If the plant grows weak, in addition to strengthening the management of water and fertilizer, 0.2% potassium dihydrogen phosphate or 1% red (white) sugar can be added to the sprayed liquid to supplement the leaf surface.
5 Note: 1 plots that are susceptible to disease. With the cruciferous vegetable flail and the neighboring land, the land that has not been seeded and planted, the land that has been planted too early, the field where the plant density is large, the land with insufficient base fertilizer and top dressing, the land where the plant grows weak, the big water The land that is flooded is easy to develop. 2 vulnerable vegetables. In addition to Chinese cabbage, radish, broccoli, rape (cabbage or green vegetables), broccoli (cauliflower), etc., are susceptible to infection by this disease, and control measures can refer to Chinese cabbage.
This article URL: How to prevent Chinese cabbage black spot
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