Where/When: Feeds on a wide variety of herbaceous plants, most commonly on potato, tomato, and sometimes on rose earlier in the growing season. Additional hosts include eggplant, pepper, pumpkin, rhubarb, asparagus, celery, lettuce, sweet potato, iris, gladiolus, and several weeds. Aphids are active from June (possibly May) through October, with decline in populations during the hottest months of the summer.