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The prevention and treatment methods are generally old chrysanthemums with serious root disease, and the incidence is severe when continuous cropping, and crop rotation should be taken care of. Once onset, clean up the affected foliage in time. Before and at the onset of disease, thiophanate-methyl, carbendazim, chlorothalonil, mancozeb, and other agents can be used for prevention and treatment.
Chrysanthemum leaf spot
Hazardous symptoms Cut chrysanthemum leaf spot can occur during the entire growth period in greenhouse cultivation, with rapid spread, high humidity, and high temperature. The main damage to the lower leaves of chrysanthemum, the emergence of round or oval yellow or brown lesions at the early stage of the disease, the dark brown depression after the lesion, the center was light gray, conidia after the formation of black spots, bottom-up Spread, when severe, the leaves turn yellow, black and dry, and do not fall off.