How to Manage Pests

Pests in Gardens and Landscapes

Entomosporium leaf spot—Entomosporium mespili or E. maculatum

Entomosporium is a fungal disease that spots the leaves of plants in the Pomoideae group of the rose family, including apple, flowering crab apple, evergreen pear, hawthorn, pear, photinia, pyracantha, quince, Rhaphiolepis, and toyon. Tiny reddish spots, sometimes surrounded by a yellow halo, appear on the leaves of infected plants, usually on older growth. These spots darken and enlarge as the leaves mature. Spore-forming bodies eventually appear in the center of the spots; these dark fruiting bodies may appear to be covered with a glossy membrane, beneath which white masses of spores may be visible. Infected plants may prematurely drop many leaves.

Identification | Life cycle

Solutions

Remove and dispose of spotted leaves that are on plants or have fallen. Do not water overhead as this spreads the fungus spores and favors infection. Reduce humidity around plants by providing adequate space between them and by pruning lower branches. Consider removing groundcovers beneath shrubs and mulching or maintaining bare soil instead. In very severe or special cases, copper compounds or chlorothalonil may be used as a preventative treatment.

Entomosporium leaf spot
Entomosporium leaf spot

Entomosporium leaf spot on evergreen
Entomosporium leaf spot on evergreen pear


Statewide IPM Program, Agriculture and Natural Resources, University of California
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