Hydrangea leaf spot is one of the common diseases on hydrangea.
Symptoms: mainly harm the leaves. After the leaves were infested, they were dark green and water-stained, and gradually expanded to 1-3 mm, with a maximum of about 15 mm. The lesions were dark brown in the later stages, and the central part was grayed out, and the edges were purple-brown and slightly raised. The diseased part produces black spots, which are the conidiospores of the germs.
Pathogen: The pathogen is Phyllosticta hy-drangeae Ell. et Fv. Conidiophores grow leaves with a diameter of 100-115 microns. Primarily buried under the epidermis and exposed afterwards. The molecular spores are oblong in shape and are 10-122.3-3.5 microns in size.
Infectious Pathway: The pathogens fell on the surface of the soil in the damaged leaves and passed through the winter. After the second year's hydrangea flower was re-spread, the germs began to move. The conidia produced spores and spread through Lishui. It is easy to develop when there is poor ventilation.
Control methods
1. Thoroughly remove the sick body, burn or deepen the land, and reduce the source of infection.
2. Spray 75% chlorothalonil wettable powder 500 times, 40% polysulfide suspension 500-600 times, 50% mixed sulfur suspension 500 times, 1:1:200 Bordeaux mixture, 77% Can kill WP 500 times, 50% copper carboxylate (DT) wettable powder 400-500 times liquid, every 10 days or so, control 2-3 times.
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