Answer: Since you've already used a pesticide, I think I would just wait it out. Some plants are quite sensitive to pesticides so you'll want to be careful and not over-apply. Curling leaves doesn't always mean insect feeding. Leaves can curl as a result of transplant stress (it takes 3-4 weeks for the roots to become established after planting) or it could be a result of over or under watering. It might even be a fungal disease (unlikely in new plants, but diseases like powdery mildew can cause leaf curl). So, I'd just allow the plants to become established before suspecting problems. If you don't like the look of the curled leaves, pull them off the plants; healthy new leaves will grow later this summer.
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