Get A Guide to Medical Entomology PDF

By M. W. Service (auth.)

ISBN-10: 0333233824

ISBN-13: 9780333233825

ISBN-10: 1349163341

ISBN-13: 9781349163342

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Mosquitoes usually disperse less than about 2 km * This is a species complex, see pp. 47~49. and most only fly a few hundred metres from their breeding places, but a few species, principally those inhabiting temperate and cold northern climates, may disperse much further, especially just after emergence. Mosquitoes sometimes get transported long distances by wind. In tropical countries adult mosquitoes probably live on average only about two to three weeks, but in temperate climates the average life may be four to six weeks or longer, and species which overwinter as fertilised and hibernating adults live for many months.

Both small and large, fresh and salt water marshy areas can be converted to impounded waters. Whenever an aquatic habitat is not eliminated but 40 A Guide to Medical Entomology modified to prevent breeding of certain mosquitoes there is the danger that such environmental changes will favour the breeding of other species that were previously either absent or present in only small numbers. Chemical control methods Paris green One of the earlier chemicals used to prevent mosquito breeding was Paris green, a copper acetoarsenite, which was applied to the water surface as a very fine dust at the rate of about I kg /ha.

9a and 4· I 5) which in a b Fig 4. 14 Abdominal palmate hairs from larva of (a) Chagasia species and (b) Anopheles species. The third and most important genus is Anopheles, which contains important malaria vectors. The following characters can identify and separate this genus from any of the 30 genera of the Culicinae. Fig 4· 15 b Dorsal and lateral views of an egg of an Anopheles. some species such as An. pseudopunctipennis can completely surround the egg. They are unable to withstand desiccation.

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A Guide to Medical Entomology by M. W. Service (auth.)

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