First, the symptoms of celery leaf spot disease, also known as early blight, mainly damage the leaves. The diseased leaves were yellow-green and water-stained lesions at the beginning. They developed into round or irregular shapes with a size of 4 to 10 mm. The lesions were grayish-brown. When the lesions became severe, the lesions expanded to form plaques and eventually the leaves were induced. Withered. The lesions on the stems or petioles were oval in shape, 3 to 7 mm in diameter, gray-brown and slightly sunken. Severe incidence of lodging of the whole plant. In high humidity, the disease minister produces a gray and white mold layer, which is the pathogenic conidiophore and conidia.
Second, prevention and control methods (a) selection of disease-resistant varieties. For example, Jinnan Shiqin No. 1.
(ii) Seed production from disease-free plants, soaking in water at 48°C for 30 minutes when necessary.
(3) Two or more years of rotation.
(d) Proper close planting and scientific irrigation to prevent excessive humidity in the field.
(e) spraying 50% of carbendazim WP 800 times, 50% of thiophanate-methyl WP 500 times, or 77% of WP 500 times .
(6) Under the conditions of protected areas, 5% chlorothalonil dust may be used, 1 kg per mu. Can also be used 45% of chlorothalonil smoke agent, 200 grams per acre, spraying every 9 days or so, continuous or alternate application of 2 or 3 times, the effect is better.
Second, prevention and control methods (a) selection of disease-resistant varieties. For example, Jinnan Shiqin No. 1.
(ii) Seed production from disease-free plants, soaking in water at 48°C for 30 minutes when necessary.
(3) Two or more years of rotation.
(d) Proper close planting and scientific irrigation to prevent excessive humidity in the field.
(e) spraying 50% of carbendazim WP 800 times, 50% of thiophanate-methyl WP 500 times, or 77% of WP 500 times .
(6) Under the conditions of protected areas, 5% chlorothalonil dust may be used, 1 kg per mu. Can also be used 45% of chlorothalonil smoke agent, 200 grams per acre, spraying every 9 days or so, continuous or alternate application of 2 or 3 times, the effect is better.
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