The prevention and treatment of sunflowers bacterial stem rot

The prevention and treatment of sunflowers bacterial stem rot

The incidence of the field is low, and the incidence of individual self-interbreeding is 46% to 100%. In addition to sunflowers, the host plants have marigold, daisies, and field, and the fungus.

1, symptom identification

Mainly for the stem and the mallow, the stem is dominated by the stem. The stem symptoms are brown and black. The brown and rotting disease tissue is brown, and then it spreads to the upper and lower part of the medulla, and the bacteria enter the pulp and then the pulp is brown and paste. The xylem and the catheter are also gradually brown, the stems are cracked and the pulp is hollow. This is the type of disease that occurs early in the disease. Water shaped type black rot disease, first show olive green, black, after disease stem hollow, ink shaped, pith quickly empty the soft rot, shrinking, disease stems outside black, has a craze, late onset is mainly the type field. Faceplate can also cause rotting in brown and black rot disease, early disease of irregular with particular shape, brown or black, suitable condition expanded quickly, causes the entire aoi plate rot in brown or black rot, and expand to the stem, to shrink kwai disc tissue breakdown, residual fiber and empty plate. The humidity is full rot.

2, occurrence regularity

Bacteria can spread through winter, weather, and irrigation water. The disease occurs and spreads easily after the rain. Three kinds of pathogenic bacteria are mixed in the field, the host is wide and the condition is suitable for the onset of the disease. More rain, more injuries and more natural fractures.

3, the method of prevention and cure

(1) breeding and planting disease-resistant varieties in accordance with local conditions.

(2) rotation of stubble: to promote more than 3 years of rotation with non-host plant, to reduce the source of invasion.

(3) strengthening the administration of the fields: scientific fertilization, rational nitrogen, phosphorus and potash, and improving the resistance of plants; Reasonable irrigation, attention to drainage after rain; After harvest, remove the disease and remove the disease.

(4) control: the early onset of spraying 14% winding copper ammonia water 350 times liquid or 30% alkali type copper sulfate rubber suspension agent 400 times liquid, 70% mildothane wettable powder 1200 times liquid, 50% refund bacteria, wettable powder 600 times liquid, 75% chlorothalonil wettable powder 600 times liquid, 80% zineb wettable powder 500-600 times liquid, 50% carbendazim wettable powder 1000 times liquid.