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Chapter 16 PEST MANAGEMENT Insects become pests when they conflict with our welfare, aesthetics, or profits. For example, otherwise innocuous insects can provoke severe allergic reactions in sensitized people, and reduction or loss of food-plant yield is a universal result of insect-feeding activities and pathogen. | TIC16 5 20 04 4 39 PM Page 395 Chapter 16 PEST MANAGEMENT Biological control of aphids by coccinellid beetles. After Burton Burton 1975. TIC16 5 20 04 4 39 PM Page 396 396 Pest management Insects become pests when they conflict with our welfare aesthetics or profits. For example otherwise innocuous insects can provoke severe allergic reactions in sensitized people and reduction or loss of food-plant yield is a universal result of insect-feeding activities and pathogen transmission. Pests thus have no particular ecological significance but are defined from a purely anthropocentric point of view. Insects may be pests of people either directly through disease transmission Chapter 15 or indirectly by affecting our domestic animals cultivated plants or timber reserves. From a conservation perspective introduced insects become pests when they displace native species often with ensuing effects on other non-insect species in the community. Some introduced and behaviorally dominant ants such as the big-headed ant Pheidole megacephala and the Argentine ant Linepithema humile impact negatively on native biodiversity in many islands including those of the tropical Pacific Box 1.2 . Honey bees Apis mellifera outside their native range form feral nests and although they are generalists may out-compete local insects. Native insects usually are efficient pollinators of a smaller range of native plants than are honey bees and their loss may lead to reduced seed set. Research on insect pests relevant to conservation biology is increasing but remains modest compared to a vast literature on pests of our crops garden plants and forest trees. In this chapter we deal predominantly with the occurrence and control of insect pests of agriculture including horticulture or silviculture and with the management of insects of medical and veterinary importance. We commence with a discussion of what constitutes a pest how damage levels are assessed and why insects become pests. Next the effects of
