Cause The fungus Colletotrichum gloeosporioides has been found a few times by the OSU Plant Clinic and is considered an occasional problem in BC. It is a problem on Euonymous japonica and E. fortunei including the very susceptible cultivars Canadale Gold, Emerald Gaiety and Emerald ‘n Gold. Favored by warm temperatures and long wet periods.
Symptoms Small leaf lesions with white, gray or tan centers and dark or reddish boarders. Centers of lesions frequently fall out, giving the leaf a “shot-hole” appearance. Stem cankers are small, oval and may be raised and scabby. Larger cankers may girdle the stem causing dieback and defoliation.
Cultural control
Grow less susceptible cultivars.
Remove fallen leaves and other plant debris from production areas.
Do not overwater, and irrigate when leaves can dry quickly.
Remove and destroy heavily infected plant parts.
Improve air circulation with increased plant spacing.
Grow under high shade intensities, rather than full sun or light shade.
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