The leaf spot of jasmine is mainly harmful to the leaves of jasmine. At the initial stage, the leaves produce brown stripes, and then gradually spread to the surrounding areas, forming large irregular spots. The diseased areas become thinner, the color is yellowish brown, and the edge has light colored fine stripes. At the later stage, the diseased spots gradually appear black grains, which can seriously cause the withered yellow leaves of plants.
Jasmine flower is a fungal disease. The pathogen can overwinter on the fallen leaves, and then spread through the spores in spring. The disease starts from May to June every year, and gradually continues to August to September. Summer is the high incidence period of disease.
Strengthen the care and maintenance on weekdays. If you find any diseased leaves of jasmine, remove them in time and destroy them in a centralized way.
Increase the application of fertilizer, jasmine should apply compound liquid fertilizer rich in phosphorus and potassium, which can promote the growth and development of plants, and increase the disease resistance of plants.
Before the occurrence of the disease, the plants should be sprayed with 600 times of 12% green emulsion copper emulsion for prevention and control. If it is found after the occurrence of the disease, it should be sprayed with 500 times of 40% chlorothalonil or 50% thiophanate methyl for killing. Spray once every 7-10 days, 2-3 times continuously.
