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Additional info for A Guide to Medical Entomology

Sample text

Lie parallel to water surface. Have abdominal palmate hairs and tergal plates. All larvae have a short or long siphon. Subtend an angle from the water surface. No palmate hairs or tergal plates. Pupae Breathing trumpets short and broad apically. Short peg-like abdominal spines on segments two or three to seven. Breathing trumpet short or long, opening not broad. No spines or abdominal segments three to seven. Adults (both sexes) Rest at an angle to any surface. In most species dark and pale scales on wing veins arranged in distinct 'blocks'.

Advanced technology and expertise is Introduction to mosquitoes required, also the ability to rear vast numbers of mosquitoes to be released into the field to compete with or replace natural populations. Not all the important vector mosquitoes can be reared in the laboratory, let alone on an enormous scale. Moreover, it is essential that reared mosquitoes live as long and are as healthy and vigorous as wild populations, otherwise they will be unable to compete with them and result in their elimination.

8). The female is now said to be gravid and she searches for suitable larval habitats in which to lay her eggs. After oviposition the female mosquito takes another bloodmeal and after two to three days (in the tropics) a further batch of eggs is matured. This process ofbloodfeeding and egg maturation followed by oviposition is repeated several times throughout the female's life, and is referred to as the gonotrophic cycle. Thus a female mosquito passes through the following physiological stages (i) unfed, (ii) blood-fed, (iii) half-gravid and (iv) gravid, during the completion of a single gonotrophic cycle.

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