Aphids may be the bane of existence for some gardeners. However, these tiny sap-sucking insects are a diverse group with some pretty interesting habits. Aphids are very common insects and are found on many plants in yards and gardens. In most cases they cause little or no damage to the health of plants. There are more than 1,200 species in North America. While some are generalists, most species of aphids are monophagous or feed on just a few species of closely related plants. If