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 program was sprayed with 1RV 120 Bordeaux solution, or Baume 0.4 degree stone sulfur mixture, or 65% Dyson zinc wettable powder 500 times, or 25% carbendazim wettable powder 300 times, once every 10 times every 14 days, for a total of 4 times.
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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 planting or potted flowers should have a suitable density, ensure the ventilation and light of the plants, reduce the leaf humidity, and put the potted flowers in the outdoor shade shed in summer to reduce sunburn and machine.
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Breeding azaleas?
Rhododendron propagation technology: mainly to cuttage propagation. Cutting selection, take the year just lignified branches, with heel break off, cut off the lower leaves, leaving 4 to 5 leaves at the top, cutting time: Western cuckoo in late May to early June, Mao cuckoo in early June to mid-June. Cuttage method: family multi-purpose pot inserted, medium with river sand, pearlite. When operating, insert the cuttings into one-third or one-half, spray them with a fine hole pot and place them under a shade. Management: Within 1 month after insertion, focus on shade and water spray. Keep the cuttings always
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