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Laboratory and cage studies were conducted to assess the life-cyde and reproduction of the carrot aphid Chomaphis (Dysaphis) foeniculus Theobald (Homoptera: Aphididae) on carrots (Daucus carota L.). There were four instar stages, with a total developmental period of 6.3 days (range 6.1-7.2 days).
Reproduction occurred in the first six days of adult life, and each female aphid produced an average of 17.1 nymphs (range 11-25). Significantly more nymphs (Ps0.05) were produced during the afternoon than the morning hours or night, and nymphal production was suppressed in cloudy overcast conditions. Because of the short developmental period and rapid reproduction after maturity, there was a relatively high rate of population build-up.