Leaf Curling, Distortion, or Scorched Edges
As feeding intensifies, damaged cells cause leaves to curl, ripple, or develop crisp, scorched margins. I saw this on my basil (Ocimum basilicum, native to tropical Asia) when new shoots emerged twisted and stunted—a sure sign those mites had been busy under the leaf hairs.
Curling foliage also creates microclimates—hiding places where mites shelter from sprays and predators. When you notice distortion or burnt edges, isolate the plant if possible, prune affected areas, and intensify your control efforts to prevent the colony from spreading.