Euonymus scale crawlers active

Euonymus scale has three generations per year in North Carolina the first of which we

White male euonymus scales and tiny orange crawlers. Photo: S.D. Frank

White male euonymus scales and tiny orange crawlers. Photo: S.D. Frank

reported on in the spring.  It is best to treat euonymus (or any) scale in the crawler stage.  So if you forgot in the spring or didn’t get sufficient control, now is your second chance.  Crawlers are active at research sites on campus and in Raleigh neighborhoods.  In the first generation crawlers come out all at once but become less synchronized in second and third generations.  Thus you may find all developmental stages present at this time.  There are many predators that feed on scale insects such as the lacewing larva in this video. However, euonymus scale still tends to reach damaging levels once established. There are a number of products that can be used to treat armored scale.  We have found neonicotinoids Safari, Flagship, and TriStar to be very effective also plant growth regulators Distance and Talus.  Note that imidacloprid is not labeled for or effective against armored scale.  Please check the updated insect note for recommendations.

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