2. The flowers of Rosa laevigata are ornamental. It belongs to Rosaceae. The flowering time is from April to June every spring. Flowers are solitary in leaf axils, white in color and fragrant in smell. It can be planted in gardens and courtyards to beautify the environment, and can also be raised as a potted plant on the balcony.
3. Disease and pest control of Rosa laevigata.
Powdery mildew: Powdery mildew mostly occurs in summer with high temperature and humidity. Harm leaves, stems and flower stalks. At the early stage of the disease, the tender leaves are twisted in light gray, and 1 layer of white powdery covering grows on the leaves, stems and flower stalks in the later stage. In severe cases, it will not bloom and the plant will die. Prevention and treatment: at the initial stage of the disease, spray 0.3-0.5 baumeishi sulfur mixture or 50% thiophanate 1000 times solution; Control the amount of nitrogen fertilizer to prevent the plant from growing too vigorously; After the new leaves grow, spray 1: 1: 100 bordeaux mixture, and spray 1 time every 7- 10 days for 2-3 times continuously.
Rose white scale: It occurs in early July and August, and the newly hatched nymph climbs to the leaf surface, main vein, tender tip, petiole or base of flower stalk to fix the cluster damage. Control method: spray 800- 1000 times of 25% phoxim emulsion or 1500 times of 40% omethoate in the incubation period; Spraying 1 3-5 times of pomeranite sulfur mixture from winter dormancy to early spring germination; Protection and utilization of natural enemy ladybug.