Identification and control of rose powdery mildew

Symptoms: germs infect leaves, floral organs, tender shoots of rose, etc. In early spring, the leaves of the diseased buds are covered with white powder on both sides. The leaves shrunk and became thicker, and then gradually dried up and died, which became the source of primary infection. During the growing season, the leaves were infected, first appeared small white powder spots, then gradually expanded into round or irregular shaped white powder spots, and in severe cases, the white powder spots were connected to each other. When the young shoots and petioles fell ill, the disease spots increased slightly and the internodes shortened. The buds are covered with powdery layer, withered and withered. Malformed flowers bloom in lightly diseased buds.

Prevention and control measures, strengthen ventilation and light transmission, increase the application of phosphorus and potassium fertilizer, appropriate application of nitrogen fertilizer. During the dormant period, 5 Baumedo stone sulfur mixture solution was sprayed. During the onset of the disease, 1500-2000 times liquid spray is used to prevent and cure the disease.