As Camille has said Imidacloprid (Merit) is great. It is available as a concentrate liquid in many of the Bayer products which can be purchased at any of the Big Box Stores. I use it both as a liquid spray and granular. I apply the granular form during summer to the outdoor plants in June and again in late August. This is so the larva get nailed before I bring everybody back into the GH for winter. The granular form will last 2 to 3 months according to the package instructions.
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