Damage symptoms of aphids, whiteflies, nymphs, scales and mealybugs include which of the following?

• A. Sticky deposits left on leaves and stems
• B. Webbing on leaves
• C. Chewed leaves
• D. Leaf curling

Answer: (A)

These pests are sap-suckers that excrete honeydew, a sugary liquid that leaves a sticky film on leaves and stems. Aphids, whiteflies, scales, mealybugs, and their nymphs all feed by piercing plant tissues and produce this honeydew, so sticky deposits on foliage are the most consistent and recognizable symptom. Other signs like webbing (typical of spider mites or certain caterpillars), chewing damage (chewed leaves), or leaf curling can occur with other pests, but the sticky residue specifically points to this group.