First, the symptoms
Rose blight is limited to the occurrence of ulcer spots on stems, and small, purplish spots appear on the stalks at the onset of the disease. The spots gradually enlarge, the color deepens, and the edges become more pronounced. The central tissue of the spot turned pale brown to grayish, and the contrast between the reddish-brown and purple spots around the lesion and the green of the stem was quite obvious. The conidiospores of the germs are tiny protrusions. With the enlargement of the separator, longitudinal cracks appear on the epidermis, and black spore piles emerge when wet, which is a special symptom of the disease. When the onset is severe, the lesion quickly wraps around the twigs, and parts of the diseased part shrink and die, darken, spread downward, and subside.
Second, control methods
In winter, the disease is cut off and burned. To trim in sunny days, the wounds will dry easily and heal. After the storm, the broken branches should be cut off in time. The incision should be as close to the axillary bud as possible, and should be subtracted together with part of the bud.
Chemical control: After trimming, apply 1:1:30 Bordeaux paste. During the growing season, it can also spray 50% Tuzet WP 700 times, or 50% carbendazim can wet the powder 1000 times, or 0.1% zearazine and 0.1% Bulent, 10-15 days 1 time.
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