Prevention and cure of cucumber bacterial blight

Cucumber blight has occurred everywhere in protected areas and has become increasingly serious.
1. Most of the symptoms are identified as adult stage disease, which mainly harms stems and leaves. The stem vines are often more spindle-shaped or oval-shaped lesions in the joints, gradually expanding up to several centimeters in length. The disease department was gray and white, accompanied by a large amount of amber sputum overflow, and the diseased part was yellowish-brown and shrinking. There was a small black spot on the diseased part. Finally, the diseased part was longitudinally distorted and numbed, but the vascular bundles did not change brown, causing the stem vines to die. Leaf disease, mostly in the edge of the leaf produces a semicircular disease, or inward V-shaped expansion from the edge of the leaf, the disease is larger, up to 20-30 mm in diameter,
Even bigger, occasionally up to half a blade. The lesions are light brown or yellow-brown, and there are vague and inconspicuous bands. Many small black spots are scattered on them. Late lesions often rupture, fruit of severe disease can sometimes be diseased, melon strips in the young flowering period of floral infection, the diseased melon umbilical smaller, vertical section after the visible upper part of the pale flesh, softened heart rot.
2 Pathogen Ascichytacitrullina Smith called watermelon shell Diphtheria, is a fungus of the fungus Subphylum fungus, black spots on the leaf lesions mostly pathogenic conidia. The conidiospore is buried under the epidermis, exposing the orifice, spherical or oblate spheroidal, dark brown, with many conidial endogeneous, short round or cylindrical, colorless, primary cells, then become twins. The black spot on the vine is sometimes the germ sac shell. The ascaria shell is spherical, black, with many straight or curved, colorless, transparent rod-shaped ascospores. There are 8 ascospores in the ascus, and ascospores are colorless and twin cells.
In addition to invading cucumbers, germs also infect watermelons, melons, loofahs, and other melon crops.
3. Onset of pathogenic bacteria with conidial or ascostic shell with the disease in the soil overwintering, or conidia attached to the surface of the seed or adhere to the frame, shelf frame wintering. Infected seedlings when germinated seeds germinate after seeding cause cotyledon incidence. Diseases in the soil caused by diseased organisms directly infested field plants and caused morbidity. After the onset of disease in the field, the conidia produced by the disease department are transmitted through wind and rain, irrigation water, and agricultural operations. The seed with bacteria can be transmitted over a long distance with the seed transported. After germination, spores can invade from pores, water holes, or wounds.
The bacteria is warm and wet. 20-25 °C, relative humidity more than 85%, when the soil humidity is easy to disease. Melons, dense colonization, poor ventilation, weak growth, etc. are all susceptible to disease, and the disease develops rapidly.

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