Symptoms of Pitaya stem blight:
Gray-white irregular lesions are formed on the edges of the plants, and many small black spots are formed. The lesions are sunken and gradually dry up, eventually forming gaps or holes, mostly in the middle and lower stem segments. Pathogen: There are currently three pathogens that can cause the above symptoms, Diplodia sp., Ascochyta sp., Phoma sp.
Integrated pest management 1. Protection of disease- free areas. Strictly control the disease-free area to transfer to the diseased area, introduce seeds, and select disease-free seedlings.
2. Planting or selecting high-quality varieties resistant to disease. It is the most cost-effective measure to prevent dragon fruit disease.
3, remove sick branches and field weeds, maintain field hygiene, thereby reducing the source of the field.
4. Strengthening the management of fertilizer and water, focusing on avoiding flood irrigation and long-term sprinkler irrigation. Flooding causes long-term anoxic state of the roots to die. Sprinkling irrigation causes the humidity of the orchard to increase, which is conducive to the occurrence of diseases. It is best to use drip irrigation technology, ridge cultivation, application of decomposed organic fertilizer. Increase the application of potassium fertilizer to improve the disease resistance of plants.
5, chemical control: prevention and treatment of anthracnose, stem blight and blight can use Bordeaux mixture, Shi Baoke, Shi Baogong, methyl thiophanate, mancozeb, carbendazim, etc., usually spray every 7-10 days , a total of 2-3 times. For the prevention and treatment of soft rot, blisters and ulcers, master copper, copper amide, agricultural streptomycin, and zinc can be used.
In order to prevent the disease resistance of pathogenic production, biological control and cultivation techniques are adopted as much as possible to reduce the amount of pesticide application.
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