Emergence and flight traps were used to study the pre- and post-diapause movements of the alfalfa weevil, Hypera postica. The emergence traps proved to be an excellent tool in determining the time of diapause termination and in providing an accurate accounting of the number of weevils per unit area in aestivation sites. The flight traps showed when diapause flights to and from alfalfa fields took place. Both trapping systems can be utilized in a pest control program to locate more closely where the alfalfa weevil aestivates and when diapause related movements occur.
Roberts, S. J.; Pausch, R. D.; Armbrust, E. J.; and Barney, R. J.
"Two Trapping Systems to Determine Incidence and Duration of Migration of Adult Alfalfa Weevils, Hypera Postica (Coleoptera: Curculionidae),"
The Great Lakes Entomologist: Vol. 11
, Article 5.
Available at: http://scholar.valpo.edu/tgle/vol11/iss4/5