How to prevent plaque in shed celery cultivation? Celery spot blight, also known as leaf blight, late blight, commonly known as "fire dragon", is a common fungal disease on celery in winter and spring protection, and the yield and quality of celery Have a great impact. Low temperature, high humidity environmental conditions are very conducive to the occurrence and prevalence of the disease. The disease mainly affects the leaves, followed by the petiole and stalk.
Cereal celery disease
When the leaves are damaged, a small spot of light brown oil immersion appears first, and then gradually enlarges. The enlarged lesions show two types: one is a small plaque type, that is, the lesion is small, generally 0.5 to 2 mm in diameter, no more than 3 mm, and the edge of the lesion is yellowish brown at the end of the disease, and the middle is grayish white. It develops from the old leaves and develops to the young leaves. Many small black spots (conidia) accumulate on the lesion.
The other is a large plaque type with a large lesion size of 3 to 10 mm in diameter. The lesions are scattered, the center is grayish brown, the edges are reddish brown, and small black spots are scattered on the lesions. When the petiole and stem are onset, the lesion is oblong, taupe, slightly concave, and small black spots on it. Plants endangered by spot blotter showed premature dryness of the leaves, hindered plant growth, and reduced commercial properties.
Prevention of celery disease in greenhouse
To prevent and cure celery spot blight, pay attention to balanced fertilization in production, base fertilizer should be applied with fully decomposed organic fertilizer, topdressing should increase phosphorus and potassium fertilizer, control the amount of nitrogen fertilizer, pay attention to supplement micro-fertilizer, and enhance plant resistance. Remove the residuals of the diseased plants in time, pay attention to ventilation and cool down, and control the temperature during the daytime at 15 °C~20 °C. When the temperature exceeds 20 °C, the air should be released in time, and the temperature at night is controlled at 10 °C~15 °C.
Do not flood with water when watering. In the early stage of the disease, use 70% mancozeb WP 600 times solution, or 50% carbendazim WP 600-800 times solution, spray once every 7~10 days, even spray 2~3 times. Have good preventive and therapeutic effects. In case of high humidity or rainy weather, it can be controlled by aerosol or dust.
Chemical control of celery bacillus in greenhouse
When the celery seedlings are 3 cm high, the spray protection is started, and the spray is sprayed once every 7-10 days, and even sprayed 2-3 times. If the disease occurs, it must be banned from spraying at the initial stage. Commonly used agents are: 70% mancozeb wettable powder, 58% toxic manganese-zinc wettable powder, 64% anti-virus WP wettable powder and other 500 times liquid spray.
75% chlorothalonil wettable powder 600 times, 70% methyl thiophanate wettable powder or 50% carbendazim wettable powder 800 times liquid, 12% green milk copper emulsifiable oil 500 times. 45% chlorothalonil aerosol can be used in the greenhouse period, 200-250 grams of smoke per acre or 5% chlorothalonil powder, 1000 grams per acre.
This article URL: How to prevent bacterial spot disease in greenhouse celery cultivation
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