First, the symptoms of the disease mainly affect the leaves, stems and fruits, and the stems are the most affected. The leaves were infected, and brown round lesions appeared in the early stages. The middle was mostly gray-brown. The late diseased part produced black small particles. Stem infected, lesions initially oval or diamond-shaped, expanded irregularly, gray-brown, brown edges, humidity or severe disease often spilled gums, causing wilting, causing the whole plant to die. The diseased part also has black spots, which are conidial or pseudocystic shells of the pathogen. The fruit is infected, and the primary water-stained dot is gradually turned into a brown-yellow depression spot. The diseased part also has small black spots, and the diseased melon tissue becomes fragile. Unlike bitter gourd anthrax.
Second, control methods
1. Selection of disease-resistant varieties: Jiangmen big-bitter gourd, Penang bitter gourd, Suixin No. 2, Xiafeng No. 2, Zhanyou bitter gourd, Yongding big top bitter gourd, 89-1 bitter gourd, Yuxi bitter gourd, Chengdu big white bitter gourd and other heat-resistant varieties .
2, grafted disease-free use of bitter gourd as scion, loofah as rootstock, bitter gourd grafted on the loofah, seed disinfection before sowing, and then bitter gourd, loofah seeds broadcast in the nursery seedlings, until the loofah grow three true leaves, Will cut off the root bitter gourd seedlings or bitter gourd shoots grafted on loofah rootstock, using tongue-connected method to cut bitter gourd seedlings cut loofah incision, to be healed after the loofah cut, until the bitter gourd grow 4 true leaves , replanting. What kind of species is used in production, and the type of grafting method used should be determined after the trial in order to avoid the problem of poor affinity.
3. Seed-free disinfection uses seed-free seeds and disinfects the seeds if necessary.
4, to strengthen the management of the application of fully cooked organic fertilizer, top dressing timely, to prevent premature aging plants.
5, timely and appropriate irrigation, timely drainage after the rain, the greenhouse should pay attention to scientific release dampness.
6. In the early stage of the disease prevention and control, 50% Thiophanate-methyl Sulphur Suspension 800 times or 75% Chlorothalonil WP is sprayed 600 times every 10 days for 2-3 times. It is also possible to apply 50 times the fungicide above.
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