The symptoms are also called mulberry leaf blight. Liaoning, Inner Mongolia, Shandong, Sichuan, Jiangsu and Zhejiang all occurred. The main damage is mulberry leaves. When the leaves of spring were onset, the mulberry leaves were dark brown with large lesions on the edge, followed by leaf growth and development, and the leaf body curled to the front of the leaf. In the summer and autumn, the tip and the neighboring leaf margins of the shoots were browned and gradually expanded, resulting in yellow-brown lesions in the anterior half of the leaves; victims of the lower leaves, large fusiforms between veins and leaf margins, and disease and health. obvious. The lesions are cracked when dry and easy to rot after absorbing water. Diseased leaves easily fall off or dry. When the humidity is high, dark blue-brown moulds are produced on the lesions, ie, meristems, spores, and conidia of pathogens.

Pathogens from Hormodendrum mori Yendo called M. mulgiensis, a fungus belonging to the subphylum Fungi. The conidial instars were brown, initially single, after forming a pedestal, the size of 235-2950-7 (um), with a diaphragm 6 to 10, the top of the stalk territories or the branches at the diaphragm grow several slender cells, mostly The unit cell, with a membrane l-3, has a significant contraction between the apical meristem apex and this cell. Conidia cells, elliptic to lemon-shaped, dark brown, growing from the top of each elongated cell, size 6 ~ l04-6 (um).

Transmission routes and pathogenic conditions The mycelia were overwintering in the diseased leaf tissue. After the spring of the year, conidial stems and conidia were produced, which spread to the mulberry leaves by wind and rain, causing initial infection. After the onset of disease, conidia were continuously formed and reinfested. In Jiangsu and Zhejiang provinces, the incidence of disease is 4 to 10 months a year, especially in summer and autumn. The bacteria cannot be deficient in water when they germinate and invade mulberry leaves, but they can produce large lesions even when the weather is dry. Under cloudy rain conditions, a large number of conidia can be produced to cause the pandemic. When the weather is dry, sporulation is low and the disease is in a stagnant state. The difference in susceptibility between the cultivars was obvious: the head of lotus leaf, white mulberry, red mulberry, and lotus leaf were susceptible; the cultivar No.2 and Xinyi were more resistant to disease.

Prevention and control methods (1) After falling leaves in late autumn, diseased leaves are collected and burned or buried in a timely manner to reduce the source of bacteria. (2) Proper close planting, moderate leaf collection, ventilation and light transmission, timely drainage after rain, and prevention of moisture retention. (3) Spraying 36% Thiophanate-containing Suspension 800 times or 50% Carbendazim-WP 1000 times at the beginning of onset. After the summer cutting, the tree was disinfected by spraying Baume 4 to 5 lime sulfur or 25% carbendazim wettable powder 500 times.

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