Rhododendron leaf spot:
Symptoms: Mainly infested leaves, in the early stage of the disease, red and brown spots appeared on the leaves, gradually expanding into round lesions or irregular polygonal lesions, dark brown. In the later stage, the central tissue of the lesion became grayish white. When the disease is severe, the lesions are connected to each other, causing the leaves to be yellow and early.
Control method:
1. Remove the leaves and treat them in autumn, and remove the diseased leaves in the growing season.
2. The density of planting or potted flowers should be suitable to ensure the ventilation and light transmission of the plants, reduce the humidity of the leaves, and the summer potted flowers are placed in the outdoor shed to reduce the wounds caused by sunburn and mechanical damage.
3. Immediately after flowering, spray 65% ​​of the sensible zinc wettable powder 500 to 600 times, or 50% of the carbendazim WP 500 to 800 times. Spray once every 10 to 14 days and spray 2 to 3 times continuously.
Rhododendron brown spot: brown spot is the main disease of rhododendron. At the initial stage, the leaves produce small brown spots, and the spots merge with each other, gradually developing into large spots, the lesions become irregular, the front color is darker, and the reverse color is lighter. In the later stage, the middle part of the lesion turned grayish brown, and many black or taupe spots were formed on the lesion. In severe cases, the branches are completely exposed and the plants are weak.
Control method: spray 1:1:120 Bordeaux mixture at the beginning of the disease, or Baume 0.4 degree stone sulphur mixture, or 65% sensitized zinc wettable powder 500 times solution, or 25% carbendazim WP 300 times solution, each Spray once every 10 to 14 days and spray a total of 4 times.
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