Prevention and treatment of bitter gourd blight

Bitter gourd disease:
The blight occurs in the bitter gourd production in the shed, and mainly damages the leaves, stems and fruits. The leaves were infected and brown round lesions appeared in the beginning and the middle was gray-brown. Stem infected, the initial lesion is oval or spindle-shaped, expanded irregularly, gray-brown, brown edges, severe conditions, the cracks on the vines appear to burst, the main craquel of the crack will open out of ash, red A colloidal fluid, commonly known as a "blood vessel"; produces a white oily substance when the side-vein is split. In severe cases, the whole plant died. After vines were dry, they became auburn. The fruit is infected with a small round of water-soaked spots and gradually turns into a brown-yellow spot. The diseased melons are easily broken. The diseased part also has black spots, and the lower parts of the lesions are mostly "black rot."
Incidence conditions:
Seed fungus can be diseased at the seedling stage. If the nitrogenous fertilizer is applied to the shed during the management process, the incidence will be heavier. The humidity in the shed is heavier when the humidity is high.
Control methods:
1. Grafting control: Loofah as rootstock, bitter gourd as scion. First, the loofah and bitter gourd seeds are disinfected and sown separately in the seedling shoots. When the loofahs grow out of 3 true leaves, the root bitter gourd seedlings or young shoots will be cut and used as a tongue grafting method to graft onto the loofahs, etc. after healing. Cut the loofah again. And other bitter gourd grow four true leaves and then colonization.
2. Rotating crops with non-guarante crops: 3 to 4 year rotations with solanaceous vegetables can destroy the living environment of pathogens and reduce the number of pathogenic bacteria.
3, seed disinfection: (1) placed in 56 degrees warm water soaked to the natural cooling, and then continue to soak for 24 hours, then germination at 30 to 32 degrees, germination, sowing. (2) Seed soaking with 50% hydrogen peroxide for 3 hours, then rinse with clean water and sow.
4. Strengthen management: Strengthen the management of fertilizers and waters, promote the use of seaweed fertilizer or active organic fertilizer, increase the application of phosphorus and potash fertilizers, and avoid partial application of nitrogen fertilizers, and be careful not to overspray the water and increase the soil permeability as much as possible. Shelters should pay attention to science to reduce air humidity. For example, if the temperature of the shed is raised to 30 degrees or more for 2 hours, opening the air outlet to open the air can play the dual role of ventilation and dehumidification.
5, chemical control: the early onset of the use of 50% sulfur suspension 800 times, 86.2% copper master WP 1500 times, 80% spray Ke WP 600 times spray control, 7 days once, 3 times in a row.