1. Strengthen management to enhance resistance. Rational fertilization, increase application of phosphorus and potassium fertilizer, clearing ditch discharge, no watering by spraying method, moderate pruning, loose soil cultivation, improve root activity, increase growth and enhance plant disease resistance. Improve cultivation management measures: susceptible varieties should be planted at intervals from disease-resistant varieties to provide isolation to reduce the spread and spread of diseases. Pay attention to plant spacing when planting, not too dense, daily watering time should not be too late, it is not appropriate to water from above, root watering should be taken to avoid splashing of water droplets to spread the spores of the bacteria to the adjacent leaves. The greenhouse should pay attention to ventilation, control humidity and reduce the disease conditions. Reasonable maintenance management helps to strengthen the disease resistance of plants.

2, remove the source of disease, combined with pruning and timely removal of diseased leaves, diseased tips, scrape the stem lesions, trim the mouth trimmed mouth should be applied in time to protect the pruning mouth to quickly heal, isolate the virus infection. Sweeping and burning the fallen leaves, combined with spring fertilization, deep overturning the soil, combined with winter pruning to remove diseased branches; dormant period 1% copper sulfate solution + new high-fat film to kill the overwintering bacteria on the diseased body.

3, combined with daily maintenance work, timely removal of diseased leaves. After the onset, the treatment was less early, and a small number of diseased leaves were found in the rose, and were removed in time. After the first removal of the diseased leaves, strict attention was paid to the black leaf lesions in the new leaves, and the lesions were all removed at a diameter of 1 mm. Practice has proved that at this time, removing the diseased leaves will not re-infect due to operation. This can usually be cured once, observe a period of no new disease, stop treatment. The leaf surface is sprayed with a new high-fat film to prevent leaf virus infection and make the leaves green and lush. Generally, there is no black spot disease infection when the height of the rose is 50-60 cm or more. No spraying is prevented, and black spot disease does not occur.

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