Author: Oluwaferni A. Oke
Advances in Science andTechnology, vol 5, No.2, September / October, 2011, pp 139 – 141
Abstract
Twenty adults of Neochetinaeichhomiae Warner were released on water hyacinth which was kept in a 5 litres water container, screened by a 30cm diameter x 180cm high cylinder wire cage covered at the top with a piece of white cloth. Five replicates were set up. The set-up was kept in an outdoor screened cage on the grounds of the Department of Zoology, University of Ibaan. Ibadan Seven day later, the number of N. eichhorniae Warner found on the different parts of the water hyacinth at a particular time (12:00 hours) of the day was recorded for five days. The insects were found to aggregate more around the rhizomes and the roots of water hyacinth. These are regions of the water hyacinth that were in contact with the medium. The number of insects found dead increases as the days increased.
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