This insect will ruin your plants. At first sign remove affected leaf and toss far away. PAC man-like worm tunnels between leaf surfaces and ruins whole plant then drops into soil to pupate for many generations during the year. No chemical control, just daily checking and removal (or else!).
David Benjamin- horticulture degree North Carolina State University graduated 1983, has worked at the nursery since 1976. Somewhat tired of eating grocery store food.