Control of rhododendron mosaic spot
The symptoms mainly infected the leaves. In the early stage of the disease, small reddish-brown spots appeared on the leaves, which gradually expanded into disease spots or irregular polygonal spots, dark brown. In the later stage, the central tissue of the lesion turned gray. When the disease is serious, the disease spots are connected to each other, resulting in withered and yellow leaves and early fall.
Prevention and control methods 1. The fallen leaves were removed and treated in autumn, and the diseased leaves were removed in time during the growing season. two。 The density of planting or potted flowers should be suitable to ensure that the plants are ventilated and transparent, reduce the leaf humidity, and put potted flowers in the outdoor shade shed in summer to reduce the wounds caused by sunburn and mechanical damage. 3. Immediately after flowering, 65% Dyson zinc wettable powder 500 Mel 600 times or 50% carbendazim wettable powder 500 Mel 800 times were sprayed. Spray every 10 Mel 14 days for 3 times in a row.
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How to treat the water quality when watering azaleas
When watering azaleas, you should pay special attention to the water quality. It is best to use natural Rain Water for water, because natural Rain Water does not contain drugs and impurities such as bleach. The second is river water and pond water, and the third is tap water. Tap water is purified soft water, which contains bleaching powder, liquid chlorine, alum and other chemicals. If this kind of water is used for a long time, it will gradually increase the alkalinity in the basin soil, which is not conducive to the growth of azaleas. Therefore, the water quality must be treated before use. The treatment is to acidify it. Water that is neutral or alkaline to water quality
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Control of rhododendron brown spot
Brown spot is the main disease of rhododendron. At the beginning, the leaves produced small brown spots, which fused with each other, and gradually developed into large spots, the disease spots were irregular, the positive complexion was darker and the negative complexion was lighter. In the later stage, the middle of the lesion becomes grayish brown, and a lot of black or grayish brown is produced on the spot. In severe cases, the branches are completely exposed and the plants are weak. At the initial stage of the disease, the prevention and treatment scheme was sprayed with Bordeaux solution, or Baume 0.4 degree stone sulfur mixture, or 65% Dyson zinc wettable powder 500 times, or more than 25%.
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