Two-spotted (spider) mite

Sap-sucking mites that flare in hot, dry conditions, giving leaves a stippled, dusty look with fine webbing underneath.

Pale stippling and a dull, dusty leaf surface, with fine webbing under leaves; tiny moving specks up close.

Hose leaves (especially undersides) to raise humidity, and spray horticultural oil. Predatory mites help in the open garden.

Keep plants well-watered in heat, avoid dusty stressed conditions, and avoid broad insecticides that kill their predators.