What visible symptom appears first on leaves affected by boxwood leafminer?

What visible symptom appears first on leaves affected by boxwood leafminer?

• A. Water-soaked appearance that develops into blisters on the lower leaf surface.
• B. Yellowing of the entire leaf.
• C. Holes in the leaf from feeding.
• D. Leaves curling downward.

Answer: (A)

The question is about recognizing the first visible sign of boxwood leafminer damage. The earliest symptom comes from the larva feeding between the leaf surfaces, which distorts the tissue and creates a water‑soaked patch that soon develops into a blister on the underside of the leaf. This blister is the telltale early indicator of boxwood leafminer activity. Yellowing of the entire leaf, holes from chewing, or leaves curling downward are not the initial signs you’d expect with this pest. Yellowing suggests broader stress or later damage, chewing holes aren’t typical until later stages of feeding, and curling is more commonly seen with other pests or problems.

The question is about recognizing the first visible sign of boxwood leafminer damage. The earliest symptom comes from the larva feeding between the leaf surfaces, which distorts the tissue and creates a water‑soaked patch that soon develops into a blister on the underside of the leaf. This blister is the telltale early indicator of boxwood leafminer activity.

Yellowing of the entire leaf, holes from chewing, or leaves curling downward are not the initial signs you’d expect with this pest. Yellowing suggests broader stress or later damage, chewing holes aren’t typical until later stages of feeding, and curling is more commonly seen with other pests or problems.