Aspects of the Biology of the Carrot Aphid Chomaphis (dysaphis) foeniculus Theobald (Homoptera: Aphididae) in Uganda

Abstract

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.