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curled leaves on semi-dwarf lemon tree

Some of the leaves on our lemon shrub, which we have planted in a humongous terra cotta pot are curled or puckered. I suspect it's some kind of plant disease and I'm afraid it might take over the entire shrub. Please advise what I should do? Thank you.
Submitted by BHGPhotoContest

That's not a disease troubling your lemon, it's citrus thrips. When they feed, these tiny insects cause leaves to distort and curl. To confirm this diagnosis, shake a branch with distorted leaves over a white sheet of paper and look closely for tiny skinny yellow-brown insects. You can kill them with Safer Insecticidal Soap, All-Season Horticultural Oil, or Ortho's Orthenex. The soap and oil are contact killers--they kill by smothering and must come in contact with the thrips to kill them. They leave no residual chemicals on the plant, so it's safe to use them right up until the day before harvest. Please read and follow label instructions.

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