Symptoms: mainly invade the leaves. At the early stage of disease, small red-brown spots appeared on the leaves and gradually expanded into round lesions, or irregular polygonal lesions, dark brown, with a diameter of 1 mm to 5 mm. In the later stages, the central tissue of lesions turned grayish. When the disease is severe, the lesions are connected to each
Other, causing the leaves to yellow and fall early. Under wet conditions, many small brown mold spots are formed below the leaf spot, ie, conidia and conidiophores of the original bacterium.
Pathogens and the incidence of the disease: Cercospora rhocdodendri Fer., Deuteromycotina, Rhizoctonia, Scirpus, Cercospora. Pathogens were overwintering on plant residues, and conidia were formed as the primary infestation source in the following year. Conidia are spread by wind and rain and invade from wounds. In Jiangxi, the disease began in mid-May and August was the peak of onset. In Guangzhou, the peak period of onset is from April to July. Azaleas cultivated under greenhouse conditions may have annual incidence. More rain, more fog, and more dew would be beneficial because the conidia germinate only in water droplets. Poor ventilation and poor growth of plants can aggravate the occurrence of diseases.
Control measures:
1. Fall leaves are completely removed in the autumn and treated, and diseased leaves are removed in time in the growing season.
2. The density of the planted pots should be suitable for ventilation and light transmission to reduce the leaf surface humidity. Summer potted flowers are placed in an outdoor shade to reduce wounds caused by sunburn and mechanical damage.
3. Immediately after the establishment, spray 65% ​​zeocin zinc WP 500-600 times, or 50% carbendazim WP 500-800 times, or 70% thiophanate-methyl wettable powder 1000 times. Spray once every 10 days - 14 days, spray 2-3 times continuously.
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