Symptoms Occurrences of planting mulberry areas in eastern and southwest China have occurred from time to time. In recent years, it has also been common in Jiangsu and Zhejiang provinces. The leaves are mainly damaged in the middle and lower branches in autumn. At the beginning of the lesion, it was light brown to brown in color. Afterwards, it expanded into a round spot with a dark brown to reddish-brown color and a gray or light brown in the middle. When the humidity is high or the rain is continuous, the lesions are swollen with water and appear perforated, and the central part of the dry lesion often cracks. The veins, petioles, and roots of the seedlings were dark red to auburn. The lesions on both sides of the lesions were scattered with tan to dark rash-like small particles, which were the spore plates of the pathogen. After multiple lesions were fused, the leaves lost coke and shedding. Seedlings suffer heavy damage.
The pathogen, Colletotrichum morifolium Hara, is known as anthrax fungus and belongs to the fungus Armyceps sinensis. Conidia disc erythematous, black, 55-300um in diameter, born under the epidermis, break through the epidermis after maturation, clustered with short-stemmed conidiophores, colorless cells, size 5-72.5-3 ( Um), stalks with conidia that produce mucous substances. Conidiospores spindle to sickle shape, unit cell colorless, size 20-403-5 (um). Between conidiophores and conidium discs, dark brown needle-like bristles set off, with 1-4 membranes, base thick, size 35-1104-5 (um).
Transmission routes and pathogenic conditions The pathogens overwintered on conidium discs and mycelium on diseased leaves, and conidia were produced in late spring, and were transmitted through the rain to the foliage for initial infection. Sporadic lesions appeared 6-7 days after infestation, and new conidia were generated 3 to 5 days later for reinfection. The onset usually begins in July, and gradually increases in August and September until the leaves fall. The disease resistance of the cultivars differed. Husang No. 7, Husang No. 32, and No. 2 were susceptible to disease, and Husang 199 was more resistant to disease.
Control methods (1) selection of disease-resistant varieties. (2) In the autumn, the diseased leaf is burned in time or the manure is reduced to reduce the source of bacteria. (3) Advocate the use of compost made from fermented bacteria and special fertilizer for mulberry to increase resistance to disease. (4) After the summer cut, spray Baume 4 to 5 lime sulfur or 25% carbendazim WP 800 times. (5) 70% thiophanate WP 1000 times or 50% carbendazim WP 1000 times, 25% Carbonate WP 500 times, 50% benomyl WP in the onset season. Times liquid, 80% anthrax Fumei WP 600 times, 80% Dasheng M-45 WP 500 times, 80% WP WP 600 times.
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