Silkworm breeding in Shangri-la County has already started. Since the early drought mulberry leaf germination is about 10 days later than in previous years, to prevent the production of high-temperature and humid mulberry trees in the later period and affect the production, the three common symptoms and prevention methods of mulberry trees are described as follows:

First, brown spot

1. Symptom identification: The disease is prone to develop in high temperature and humidity conditions in summer and autumn. The disease mostly occurs on young leaves. In the early stage of disease onset, water spots form small spots, which expand into polygonal brownish-spotted lesions. Perforated corruption.

2. Control agent: Use 50 carbendazim WP 1000-1500 times solution (add 0.2?-0.5? detergent powder as adhesive), or 70% thiophanate WP 1500 times solution, or 50% Torr Bujin spray 1000 times, spray once every 10-15 days until the disease control (carbendazim, thiophanate safe for silkworm).

Second, bacterial black fungus (also known as bacterial disease)

1. Symptoms identification: The disease caused damage to the mulberry branches. The new shoots were young. After heavy rains occurred in summer and autumn, there were oily, garden-like, or polygonal lesions on the foliage at the onset of the disease. The lesions gradually became yellow-brown and the leaves shrank. When withered off, the disease is also known as black fungus, bad head disease. In case of strong winds, the diseased area is easily broken and the fracture overflows.

2. Control agent: In the early stage of disease, it can be sprayed with Bordeaux mixture 0.6-0.7 (residue period 20-30 days) or sprayed with 300-500 units terramycin solution, (add 0.3-0.5 grams of powder per 1000 grams of water or add 50 10,000 units of injections 3/5 - 1 sticks) or 100 units of streptomycin solution (0.1 g of powder per 1000 g of water or 1/5 of 500,000 units of injection) once every half month.

Third, Mulberry Blight

1. Symptom identification: The disease has a discoloration zone around the winter buds of the mulberry tree, which gradually expands. When the lesion expands around the branches, the flow of the sap cuts off and the branches above the disease area dry up. During the onset of disease, the cortex of the branches easily peels off and emits an alcohol odor.

2. Control agent: During the dormancy period of winter mulberry tree, use 5-6 degree lime sulfur agent of Bomer, or 15% fluosilicic acid 200 times, or 0.2% copper ammonium solution to spray and disinfect branches to eliminate overwintering pathogens; grow mulberry trees. Wound wounds are sterilized with 1% copper sulphate (residue for 10-15 days) or 65% dexamethasone 500 times (residue period 5-7 days) and then coated with 40% lime slurry (4 pound lime, 10 pounds water). If necessary, spray 70% Thiophanate 1000 times.

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