The symptoms of azalea leaf spot mainly infect the leaves. At the early stage of disease, reddish-brown spots appear on the leaves and gradually expand into round lesions or irregular polygonal lesions, dark brown. In the later period, the central tissue of the lesion turned grayish. When the disease is severe, the lesions are connected to each other, causing the leaves to yellow and fall early.
Control methods
1. Fall leaves are removed and treated in the autumn, and diseased leaves are removed in time in the growing season.
2. The density of planting or potted flowers should be appropriate to ensure that the plants are airy and transparent, and the leaf surface humidity is reduced. The summer potted plants are placed in the outdoor shade shed to reduce the wounds caused by sunburn and mechanical damage.
3. Immediately after flowering spray 65% ​​zeocin WP 500 to 600 times, or 50% carbendazim WP 500 to 800 times. Spray once every 10 to 14 days and spray 2 to 3 times continuously.
Azalea brown spot Brown spot is a major disease of azaleas. At the time of initial development, the leaves produce small brown spots, the spots fuse with each other, gradually develop into large spots, the spots become irregular, the front side is darker, and the back side is lighter. In the later period, the middle of the lesion became gray-brown, and many black or gray-brown dots were produced on the lesion. In severe cases, the branches are completely exposed and the plants are weak.
At the beginning of the disease prevention and control method, 1:12:120 Bordeaux mixture is sprayed, or Baume 0.4 degree lime sulfur, or 65% zeocin zinc WP 500 times, or 25% carbendazim WP 300 times, every other time. Spray 10 to 14 days, 4 times in total.
Control methods
1. Fall leaves are removed and treated in the autumn, and diseased leaves are removed in time in the growing season.
2. The density of planting or potted flowers should be appropriate to ensure that the plants are airy and transparent, and the leaf surface humidity is reduced. The summer potted plants are placed in the outdoor shade shed to reduce the wounds caused by sunburn and mechanical damage.
3. Immediately after flowering spray 65% ​​zeocin WP 500 to 600 times, or 50% carbendazim WP 500 to 800 times. Spray once every 10 to 14 days and spray 2 to 3 times continuously.
Azalea brown spot Brown spot is a major disease of azaleas. At the time of initial development, the leaves produce small brown spots, the spots fuse with each other, gradually develop into large spots, the spots become irregular, the front side is darker, and the back side is lighter. In the later period, the middle of the lesion became gray-brown, and many black or gray-brown dots were produced on the lesion. In severe cases, the branches are completely exposed and the plants are weak.
At the beginning of the disease prevention and control method, 1:12:120 Bordeaux mixture is sprayed, or Baume 0.4 degree lime sulfur, or 65% zeocin zinc WP 500 times, or 25% carbendazim WP 300 times, every other time. Spray 10 to 14 days, 4 times in total.
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