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. (Henan Science and Technology Daily)
Flowers, herbaceous plants with ornamental value, plants known collectively, is used to admire xi Yang and hardy, capable of reproducing short branches, there are many kinds.Typical flower, on a limited growth in the short axis, borne the sepal, petal, and produce reproductive cells of stamen and pistil.Flower is composed of corolla, calyx, receptacle, flower, there are all kinds of colors, some grow very gorgeous, has a fragrance.
Flower Seeds,Grass Seeds,Scallions Ball Seeds,Hybrid Verbena Seeds
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