Source: NCSU COOPERATIVE EXTENSION, 4/29/21


Calico scale, Eulecanium cerasorum, was accidentally introduced to California from Asia in the 1920s. It has now become established in many eastern and north-central states. Calico scales attack maples, honeylocust, hackberry, dogwood, walnuts, stonefruits, sweetgum, and many other tree species. Calico scale adults and immatures feed on phloem. They produce copious amounts of honeydew, coating underlying leaves and surfaces and promoting sooty mold growth. Heavy infestations can lead to loss of tree vigor, foliage distortion, and branch dieback.

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