Aphids are sap sucking insects that feed on young plant growth. They have the capacity to increase in number very quickly under the right conditions. Aphids produce large quantities of ‘honeydew’, a sweet exudate that encourages the growth of sooty mould. This can reduce photosynthesis and make fruit look unsightly. Fortunately most aphids have several biological control agents and it is possible to achieve good aphid control without necessarily resorting to chemical treatments.