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colour (Fig. 5.2a). The egg case measures 8–10mm …
288 CHAPTER 5 COCKROACHESCHAPTER 5 CockroachesUnhygienic scavengers in human settlementsCockroaches are among the most common pests in many homes and otherbuildings. At night they search for food in kitchens, food storage places, rubbishbins, drains and sewers. They are pests because of their filthy habits and bad people may become allergic to cockroaches after frequent exposure. Cock-roaches can sometimes play a role as carriers of intestinal diseases, such asdiarrhoea, dysentery, typhoid fever and are insects, flattened from top to bottom, usually with two pairs ofwings folded flat over the back (Fig. ). Most species rarely fly but they walk veryfast.
BIOLOGY 293 Heavy infestations of cockroaches can be dealt with by chemical control mea-sures, followed by environmental management to deprive the insects of food and
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