Celery leaf spot and spot blotch control technology
Symptoms of leaf spot disease: celery leaf spot disease, also known as early blight, damages leaves, petioles and stems. The lesions on the leaves are yellow-brown and round, connected to form large dead spots to death. The petiole and neck lesions are elliptical, taupe, slightly concave between the leaves, and the white mold layer is formed in the diseased part when the humidity is high.
Symptoms of spot blight: celery spot blight damages the leaves to form yellow-brown necrotic spots, and the edge of the lesion is dark red. The lesions on the petiole and stem are brown, oblong, and concave in the middle. Generally, the old leaves on the edge of the plant first develop and gradually develop into the inner new leaves.
Control methods: 1. Select resistant varieties. 2. Implement a rotation for more than 2 years. 3. Strengthen field management, timely discharge after rain, and cover the film at the noon to pay attention to film cooling and dehumidification. 4. Chemical control: In the early stage of the disease, the following chemicals can be used for prevention and treatment. 77% can be used to kill WP 500 times or 75% chlorothalonil WP 700 times, 50% carbendazim WP 1000 times. Liquid, 10% oxazolidine moisture agent 1500 times solution, 70% propionate zinc wettable powder 500 times solution, once every 7 days, even 2 to 3 times. (Li Xiaomao)
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