How many generations of boxwood leafminer are there per year?

How many generations of boxwood leafminer are there per year?

• A. One generation.
• B. Two generations.
• C. Three generations.
• D. Four generations.

Answer: (A)

The key idea is that boxwood leafminer in Maryland completes its life cycle only once each year, making it univoltine. Adults emerge in spring and lay eggs on new growth; the larvae mine within the leaves, develop into pupae, and the cycle ends as those pupae produce the next year’s adults. Because the entire life cycle fits into a single year, you typically see just one generation per year in this climate. In warmer regions, you can get additional generations, but Maryland’s conditions usually support only one. Understanding this helps you time monitoring and controls for the period when new growth is first coming out and eggs are being laid, since once mines are established, control becomes more challenging.

The key idea is that boxwood leafminer in Maryland completes its life cycle only once each year, making it univoltine. Adults emerge in spring and lay eggs on new growth; the larvae mine within the leaves, develop into pupae, and the cycle ends as those pupae produce the next year’s adults. Because the entire life cycle fits into a single year, you typically see just one generation per year in this climate. In warmer regions, you can get additional generations, but Maryland’s conditions usually support only one. Understanding this helps you time monitoring and controls for the period when new growth is first coming out and eggs are being laid, since once mines are established, control becomes more challenging.