What kind of leaf damage do leafminers cause?

What kind of leaf damage do leafminers cause?

• A. Winding tunnels (serpentine mines) or blotch mines inside leaves caused by larvae feeding within leaf tissue
• B. Leaf curling on margins
• C. Soil crusting
• D. Stem cankers

Answer: (A)

Leaf miners are immature insects that live and feed between the upper and lower surfaces of a leaf. Their feeding creates distinctive internal damage inside the leaf tissue, showing up as winding tunnels (serpentine mines) or as blotchy, irregular areas (blotch mines). Because the damage occurs inside the leaf rather than on the margins, on the surface, or on other plant parts, this pattern is the classic sign of leafminer activity. Other problems described—leaf curling on margins, soil crusting, or stem cankers—affect different parts of the plant or arise from different causes, so they don’t match the internal, mined-tissue damage caused by leafminer larvae.

Leaf miners are immature insects that live and feed between the upper and lower surfaces of a leaf. Their feeding creates distinctive internal damage inside the leaf tissue, showing up as winding tunnels (serpentine mines) or as blotchy, irregular areas (blotch mines). Because the damage occurs inside the leaf rather than on the margins, on the surface, or on other plant parts, this pattern is the classic sign of leafminer activity. Other problems described—leaf curling on margins, soil crusting, or stem cankers—affect different parts of the plant or arise from different causes, so they don’t match the internal, mined-tissue damage caused by leafminer larvae.