Rose scientific name Rosa rugosa Thunb. The Chinese name rose and Rosa chinensis Jacg. are Rosaceae plants. The former uses flowers as medicine, and the rose uses buds or first flowers as medicine. Rose has qi and blood function. Jiangsu, Zhejiang, Shandong, Anhui, Hebei, Hubei and Sichuan have all been cultivated. The Chinese rose has the function of promoting blood circulation and regulating blood circulation and reducing swelling. Distributed in Hebei, Shaanxi, Shandong, Jiangsu, Anhui, Henan, Hubei, Guangdong, Sichuan, Guizhou, Yunnan and Tibet. Color version 1991589 Symptoms mainly affect the leaves, petioles and stems, and pedicels and flowers. The leaves of the diseased leaves are dark brown and nearly round to irregularly shaped lesions, with a size of 3-2 lmm. The branches have branched mycelial filaments that extend radially outwards, and later lesions are linked into irregularly shaped large spots. Young stems and petioles infected lesions are mostly oblong, purple, and the surrounding tissue is slightly wrinkled. Pedicel and flower spots are small and inconspicuous. When the disease is serious, it causes a large number of fallen leaves. The remaining bald branches and dead shoots seriously affect the quality and yield.

The pathogen, Dip10carpon rosae Wolf, is called rose bivalve and belongs to Ascomycete spp. The anamorphic state is Marssonina rosae, which is called Sporotrichum sp., with the synonym Actinonema rosae (Lib.) Fr. Called spore shield spores. All belong to the fungus Fungi. The apical disc was born under the stratum corneum of the host and was dark brown in color with a diameter of 100-250 μm. Ascaria cylindrical, with short handle, size 70 to 8015 (Ftm). Side thread-shaped, with a diaphragm, the top of the expansion. Ascospores are oblong or elliptical, cells, sizes, contractions, colorless, size 20 to 25 μm. The conidia plate is also born under the stratum corneum. It is mostly connected with mycelia. The conidiophores are short, inconspicuous and colorless; the conidia are long oval to elliptical, the twin cells are colorless, the sizes are different, and the divisions are separated. Slightly curled up, most of the cells at one end are smaller and narrower, straight or slightly curved, and cause damage to Chinese rose, rose, rose and so on. The virulence of this strain is obviously different. There are 3 races in the world. The pathogenicity of pathogens in southern China is stronger than that in the north.

Transmission routes and pathogenic conditions The mycelia are overwintering on the host bud scales, leaf scars, dead branches and fallen leaves, and conidiospores are produced after the last spring rain, spreading through wind and rain. There are water droplets on the leaf surface, and the temperature is suitable. The conidia can germinate and invade after 6-10 hours. After 3-6 days of incubation, the symptoms are obvious. There is a difference in disease resistance among varieties: Ancient city scenery, vocal singing, gold not changing, goldfish red, Luoshen, Jinzhiyuye and other varieties are all susceptible.

Control methods (1) Selection of disease-resistant varieties such as Elizabeth, black hair layer, and black cyclone. (2) Take care to remove the sick leaves and burn them together. (3) Strengthen field management. (4) Spraying 36% thiophanate-methyl suspension or 50% carbendazim or 75% chlorothalonil wettable powder 600 to 700 times, 25% benomyl 800 times, 12% green at the beginning of onset. Breastmilk EC 600 times.

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