Control of Tetranychus Tetranychus in rhododendron holly
Distribution and harm have occurred in Japan, South Korea, the United States and other countries. Harm to azaleas, camellia, tea, etc.
Morphological characteristics
Female mite: reddish brown, body length about 0.14 mm.
Male mite: body length is about 0.33 mm. The damage of this mite to rhododendron is mainly from May to July and from October to December, and it can absorb juice on the front and back of the leaves, and the leaves are yellowish green in severe cases.
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Rhododendron rot
Symptoms rhododendron flower rot only harms flowers, resulting in shortened florescence, flower sagging, early withering and shedding. After the petals are infected, the diseased part loses its luster, is waterlogged, softens and fades, and finally turns brown, rotten and black, and a gray mildew layer grows on the surface when it is wet, affecting the ornamental. The pathogen and incidence regularity of the disease belongs to semi-known bacteria subfilaria fungi. The bacteria form sclerotia on the rotten flowers, and the sclerotia fall into the soil with the abortive flowers to overwinter. During the flowering period of the following year, conidia are produced, which are dispersed by wind and rain or spread by air, and sprout in flowers.
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Key points of cultivation techniques of Rhododendron
1. The choice of land preparation should be warm and humid, light is not too strong, cool climate, fertile soil, acid soil rich in humus, neutral soil with pH below 7 or pH=5-6, good drainage and ventilation. two。 Propagation method (1) seed propagation method most rhododendrons can bear fruit and collect seeds, only double petals are not fruiting. Generally speaking, the ripening period of seeds is from October to January every year. When the pericarp changes from green to yellow to brown, the top of the fruit will crack and the seeds will begin to scatter.
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