Aphids
for maintaining healthy, productive crops. Biological control of aphids uses a combination of natural enemies that attack aphids in different ways: Parasitic [...] during each of these moults, betraying their presence in the crop. There are two types of aphid species: those that change to other host plants in the winter [...] extract large quantities of sap in order to get sufficient protein. As a consequence, the excess sugar is secreted in the form of honeydew, making the crop