Rhododendron Rhododendron simsii Planch. Alias ​​Rhododendron, Rhododendron, Azalea, Yanshanhong, Yanshanhua, Qingminghua, etc. Is a deciduous or semi-evergreen shrub of the Azalea family. Use roots, leaves and flowers as medicine. With rheumatism, blood circulation, hemostasis, detoxification, phlegm and cough.
Symptoms are also known as gall tumors, leafy swollen disease. Mainly in young leaves, shoots and flowers. Leaf lesions produce pale green bread-like fleshy freckle, with grayish white viscous powder, and late freckle dry brown cake-like patches, resulting in distortion of the leaf blade. New shoots become infected with hypertrophic leaves and dry out. Flowering disease also becomes hypertrophic, forming neoplastic malformation flowers, with grayish white powder on the surface. Sick and sick flowers die.
Pathogen Exobasidium rhododendri Gramerr is known as a bacterium belonging to the genus Basidiomycetes. Sub-solid layer of velvet, bearing cylindrical to stick-like, small stem top students, small stems born 2-4 spores. The basidiospores are curved long spindles, colorless, with a size of 10-202.5-5 (μm).
Transmission Pathway and Pathogenic Conditions The pathogenic bacteria in the diseased tissue overwintering or over-summer occurs when the conditions are appropriate, and the spores are transmitted through wind and rain. The infected seedlings become an important source of long-distance transmission. The disease is a low-temperature and high-humidity disease, the temperature is 15-20 °C, relative humidity is higher than 80%, even more rainy weather and the host is in the algae or new leaves, easy to disease, usually in April-May incidence. Autumn flower bud formation also occurs.
Prevention methods (1) The diseased leaf and diseased shoots were found to be removed and destroyed in time to prevent the spread of the disease. (2) In the onset of spring, attention should be paid to its ventilation and light transmission. After the rain, it should be drained in time to prevent moisture retention. (3) Before the spring azaleas germinate Baume l. Lithosulfide mixture kills the source of overwintering bacteria. The new leaf was sprayed with Baume 0.5 after unfolding. Stone flow mixture or 1:1:100 times Bordeaux mixture.
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