Damage from caterpillars primarily results in what visible symptom on leaves?

Caterpillar damage on leaves is characterized by a distinct symptom known as skeletonization. This occurs when caterpillars feed on the leaf tissue, consuming the soft portions while leaving behind the tougher veins, which creates a "skeleton" appearance on the leaves. This visible damage can significantly affect the leaf's ability to photosynthesize effectively, ultimately impacting the health of the plant.

While discoloration, blotches, and pitting can also be symptoms of leaf damage caused by other insects or diseases, they do not specifically represent the feeding pattern associated with caterpillars. Discoloration often indicates stress or disease rather than direct feeding. Blotches may be caused by fungal infections or other pests, while pitting is typically a sign of a different type of damage like leaf miners or other herbivorous insects.