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What should be done if a primrose gets anthracnose?

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[Pathogen]Colletotrichum primulae, a fungus belonging to the Deuteromycotina subdivision and the genus Colletotrichum. [Symptoms]Brown round or nearly round spots appear on the leaves, and later sparse small black dots arranged in rings form on the spots; these are the pathogen's acervuli. [Occurrence pattern]The pathogen overwinters on infected fallen leaves, and conidia spread by wind and rain and enter through wounds. [Epidemic characteristics]Higher humidity favors the occurrence of the disease or aggravates the condition. [Control measures

[Pathogen]Colletotrichum primulae, a fungus belonging to the Deuteromycotina subdivision and the genus Colletotrichum.

[Symptoms]Brown round or nearly round spots appear on the leaves, and later sparse small black dots arranged in rings form on the spots; these are the pathogen's acervuli.

[Occurrence pattern]The pathogen overwinters on infected fallen leaves, and conidia spread by wind and rain and enter through wounds.

[Epidemic characteristics]Higher humidity favors the occurrence of the disease or aggravates the condition.

[Control measures]A. Promptly remove diseased leaves or fallen leaves to reduce sources of infection. B. In the early stage of the disease, spray 65% zineb wettable powder at 600 times dilution, or 50% carbendazim wettable powder at 800 times dilution, or 80% anthracnose thiram wettable powder at 500-800 times dilution for control.

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