How many generations of Euonymus scale occur per year in Maryland?

How many generations of Euonymus scale occur per year in Maryland?

• A. One
• B. Two (partial third possible)
• C. Three
• D. Four

Answer: (B)

In Maryland, Euonymus scale typically completes two full generations in a year, with a partial third generation possible in warmer years. The plan unfolds as overwintering scale females release eggs that hatch into crawlers in spring; these mobile crawlers settle and develop into the first generation. A second wave of crawlers appears later in the growing season, producing the second generation. If conditions stay unusually warm and long into fall, a partial third generation can occur before winter hits. Because crawlers are the stage most vulnerable to control measures, targeting sprays or oils when crawlers are active—early spring and again in late summer—is the most effective timing.

In Maryland, Euonymus scale typically completes two full generations in a year, with a partial third generation possible in warmer years. The plan unfolds as overwintering scale females release eggs that hatch into crawlers in spring; these mobile crawlers settle and develop into the first generation. A second wave of crawlers appears later in the growing season, producing the second generation. If conditions stay unusually warm and long into fall, a partial third generation can occur before winter hits. Because crawlers are the stage most vulnerable to control measures, targeting sprays or oils when crawlers are active—early spring and again in late summer—is the most effective timing.