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Flight initiation and flight activity in Prostephanus truncatus (Coleoptera: Bostrichidae)

Published online by Cambridge University Press:  10 July 2009

D. Scholz*
Affiliation:
International Institute of Tropical Agriculture, Plant Health Management Division, 08 BP 0932, Tri Postal, Cotonou, Republic of Benin, West Africa Institut für Pflanzenkrankheiten und Pflanzenschutz, Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
C. Borgemeister
Affiliation:
International Institute of Tropical Agriculture, Plant Health Management Division, 08 BP 0932, Tri Postal, Cotonou, Republic of Benin, West Africa Institut für Pflanzenkrankheiten und Pflanzenschutz, Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
R. H. Markham
Affiliation:
International Institute of Tropical Agriculture, Plant Health Management Division, 08 BP 0932, Tri Postal, Cotonou, Republic of Benin, West Africa
H. M. Poehling
Affiliation:
Institut für Pflanzenkrankheiten und Pflanzenschutz, Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany

Abstract

In an outdoor experimental set-up, the number of Prostephanus truncatus (Horn) flying from maize cobs was recorded over 38 observation weeks. Flight activity in the field was recorded for 50 weeks with three pheromone traps, each placed at c. 100–300 m from the first experimental set-up. Multiple regression analyses revealed that both flight initiation and flight activity were partly influenced by mean temperatures, but were not directly related. Flight initiation was mainly dependent on population density. An additional experiment showed that sex ratios among pheromone trap catches were not correlated with the number of beetles caught; sex ratios were female-biased throughout the year. Seasonal fluctuations in flight activity recorded with pheromone traps are mainly dependent on changes in the number and sizes of beetle populations in a given area, as well as on breeding site availability and suitability.

Type
Review Article
Copyright
Copyright © Cambridge University Press 1998

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