Aphids are small, sap-feeding insects that are common pests to gardens. Feeding on plants heavy in sap, aphids form usually brightly colored colonies on the underside of leaves and stems. Aphids are one of the most destructive pests, and are common to more temperate regions of the …globe. They can reproduce asexually, and if not manage, will rapidly infest a grow area. Luckily, HTG Supply carries a variety of aphid controlling products. Browse below to find the pest control that meets your needs.