The product is suitable for the spring or fall of greenhouse, open field cultivation production, good shape, early maturity, strong cold resistance, high disease resistance, is one of the best varieties of thermal cultivation, sprawling, podding rate is high, the high yielding good, increase rate of big, about 4000 kg per mu.
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Symptoms The disease is a relatively common and serious disease in Milan. The disease occurs on the leaves, petioles, shoots and stems. At the early stage of disease, the tip or the leaf margin becomes brown and gradually expands toward the leaves. The lesions are sharp at the edges. When the petiole first develops, the diseased part becomes brown and expands toward the leaves, turning the main vein, the branch vein, and the entire leaf brown or downward. Extend the brown petiole, branchlets and stems to form necrotic ulcer spots. During the onset of disease, the leaves and petioles continued to fall off, and finally the leaves of the entire plant fell and the branches dried up and died. In high-humidity conditions, the diseased part can produce many small black spots with orange-red mucus that are conidium and conidia discs of pathogenic bacteria. Pathogen and Pathogenesis The disease is caused by the fungus Deinococcum sp. The pathogenic bacteria used mycelium or conidia to overwinter in the leaves or the diseased body, and began to develop in March. Under suitable conditions of temperature and humidity, the latent hyphae soon produced conidial discs and conidia, and the spores germinated to form appressorium. After the formation of invasive silk directly invade the host and grow between cells, the incubation period is 7 days. Conidia cause multiple re-infestations during the growing season. Pathogens spread by raindrops (or water), wind, or insects and spread by seedlings at a distance. Temperatures range from 25 to 30°C under high humidity conditions and diseases develop. Prevention methods 1. Pay attention to conservation, and pay attention to ventilation and evacuation in greenhouses or production areas, remove and cover diseased leaves and diseased branches in time, and reduce pathogens. 2. Rational application of nitrogen, phosphorus and potash fertilizers to promote robust plant growth and increase disease resistance. 3. Chemical control: At the beginning of the disease, 80% of anthraquinone may be sprayed with 400 to 800 times solution or 70% thiophanate 800 to 1000 times solution or 1% Bordeaux mixture. It is also possible to use 50% cefotaxime 500 times and other fungicides. . (Ye Shuying Song Zunxin)