Monitor for crawlers of Euonymus scale over the coming weeks. Plants near buildings or in locations with warmer microclimates should be monitored first. Nymphs are pale green in colour. They feed on the underside of leaves. First feeding damage looks like small, pin-point yellow spots on the upper surface.
Crawlers hatch over an extended period of time.
Treat once hatch is observed and follow with a second treatment as required. Systemic insecticides are more effective. Cooley spruce galls and Eastern spruce galls are becoming more noticeable on spruce at this time. Pick off small infestations by July to reduce populations, where possible. Chemical control is not effective at this time since the insect is feeding deep within the gall tissue.