Thrips can enter greenhouses through migration, or via contaminated cuttings or seedlings.

Chilli thrips (Scirtothrips dorsalis) attack plants with new foliage growth, and deform and at times discolor foliage. Chilli thrips are much smaller than western flower thrips, so they are extremely hard to see when you’re scouting.

Brett Alldredge, pest management supervisor at Greenleaf Nursery in Texas, handles pest and disease control for 450 acres of ornamental crops. In Texas, Alldredge says chilli thrips start in April and continue to be a problem through October, peaking in the hot summer months.

“Those are a real challenge because they fly in in waves and they attack anything that flushes,” he says.

Sources: University of Florida IFAS, Texas AgriLife Extension