Boxwood Moth: What You Need to Know

The Boxwood Moth is an invasive pest that poses a serious threat to boxwood shrubs. It has recently become a growing concern in Western New York and surrounding regions.

How It Affects Boxwood

The damage is caused by the caterpillar stage of the moth, which feeds aggressively on boxwood leaves.

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• Rapid defoliation (leaves eaten down to stems)
• Fine webbing throughout the plant
• Browning and dieback of foliage
• Repeated infestations can lead to complete plant loss

Left untreated, boxwoods can decline quickly—even mature, established plants.

Signs to Watch For

• Chewed or “skeletonized” leaves
• Small green caterpillars with black striping
• Webbing inside the shrub
• Sudden browning despite proper care

Treatment & Control

Early intervention is critical for successful control.

Recommended approach:

• Biological treatment: Apply Bacillus thuringiensis (Bt) during early larval stages, or Sevin or Eight
• Timing: Multiple applications may be required throughout the season
• Monitoring: Regular inspection to catch new hatch cycles

Professional Recommendation

Consistent monitoring and properly timed treatments are key. In high-risk areas, preventative spraying programs are strongly recommended to protect valuable boxwood plantings.