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Euonymus Scale

May 26, 1999
Euonymus scale crawlers have been found at The Morton Arboretum in northeastern Illinois. They are being found on plants in warmer locations along sunny walls. The crawlers look like tiny yellow spots crawling on the leaves or stems and show up easiest on the leaves. Male adult scales are white, while females are dark brown and oyster-shell shaped. Stressed plants are most susceptible to attack. The scale can cause defoliation and death of the plant. This scale is found most commonly on evergreen euonymus. It is not being found on winged euonymous or burning bush. Pruning out heavily infested branches can help reduce the number of scales. The crawlers are controlled by many insecticides.
Author: Phil Nixon staff at The Morton Arboretum


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