 Parasitoids are host specific The potato aphid (Macrosiphum euphorbia) is usually responsible for aphid infestations of tomatoes and other Solanaceae crops. The smaller Melon aphid (Aphis gossypii) or Green peach aphid (Myzus persicae) are also pests, especially if tomatoes are grown near ornamental crops. Click here for additional information. These parasitoid species are tiny wasps that are often captured on sticky cards, unlike aphids. However, many local species of tiny wasps enter the greenhouse and are often found on the sticky cards. It is difficult to identify them to species. Below is a table of natural enemies used against aphids. Release of the proper parasitoid, in most cases probably aphidius ervi, will provide faster control of aphid populations. | 