Monday, July 13, 2015

Entomosporium leaf spot on Indian Hawthorn

Brown spots and yellowing on a plant caused by a fungus.
Entomosporium leaf spot on Indian hawthorn
(Photo: NMSU - PDC)
Featured Diagnosis: Entomosporium leaf spot on Indian hawthorn (Rhaphiolepis indica) – Entomosporium leaf spot is a fungal disease caused by Entomosporium sp. It is common on trees and shrubs in the rose (rosaceae) family. It can be particularly troublesome on Indian hawthorn and red tip photinia. In some areas, these shrubs are no longer widely used in the landscape because of their susceptibility to this disease. Other hosts of this pathogen include pyracantha, pear, quince, loquat, and mountain ash. The primary symptom of this disease is the development of reddish-purple spots on the foliage. The fungus produces characteristic “insect-shaped” spores which are diagnostic.

Microscope photo of insect-shaped fungus spores
Characteristic "insect-shaped" spores
of Entomosporium sp. (Photo: NMSU-PDC)

Dark, reddish-purple spots on a leaf.
Leaf spots on Indian hawthorn caused by
Entomosporium sp. (Photo: NMSU-PDC)

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