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Control Methods for Various Pests and Diseases of Schisandra

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(1) Powdery mildew and black spot are two common diseases of northern schisandra (Schisandra chinensis), generally occurring in early June. Control methods: The onset periods of the two diseases are similar. In late May, spray once with a 1:1:100 equal-strength Bordeaux mixture for prevention. If no disease occurs, spray once every 7-10 days. For powdery mildew, use 0.3-0.5 degree lime sulfur mixture, or fenarimol or thiophanate-methyl wettable powder at 800 times dilution; for black spot, use mancozeb 50% wettable powder at 600-800 times dilution. If both diseases

(1) Powdery mildew and black spot are two common diseases of northern schisandra (Schisandra chinensis), generally occurring in early June. Control methods: The onset periods of the two diseases are similar. In late May, spray once with a 1:1:100 equal-strength Bordeaux mixture for prevention. If no disease occurs, spray once every 7-10 days. For powdery mildew, use 0.3-0.5 degree lime sulfur mixture, or fenarimol or thiophanate-methyl wettable powder at 800 times dilution; for black spot, use mancozeb 50% wettable powder at 600-800 times dilution. If both diseases show a developing trend, fenarimol and mancozeb can be mixed and prepared for a single combined control, still using the respective concentrations mentioned above.

(2) Root rot occurs from early May to early August, damaging the roots. Control methods:

① Choose land with high, dry terrain and good drainage for planting;

② During the disease period, irrigate the root zone with 50% carbendazim at 500-1000 times dilution.

(3) Leaf blight occurs from late May to early July, damaging the leaves. Control methods: In the early stage of the disease, alternately spray with 50% thiophanate at 1000 times dilution and 3% validamycin at 50 ml/L (ppm) solution. The number of sprays can be determined according to the severity of the disease.

In terms of management, pay attention to the reasonable distribution of branches and vines, and appropriately increase the proportion of phosphorus and potassium fertilizers to improve the disease resistance of the plants; before budding, remove diseased branches and leaves and burn them in a centralized manner or bury them deeply, and spray the whole orchard once with 5 degree lime sulfur mixture. To prevent damping-off and other soil-borne infectious diseases, after sowing and covering with soil, combine with watering and spray 800-1000 times dilution of 50% amobam aqueous solution.

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