A modified Berlese funnel system was developed to extract alfalfa weevil larvae (Hypera postica) from quadrats 30.5 cm on a side. Data from this system were comp.wed with simultaneous data from a hand sorting extraction system. In most instances, the modified Berlese system was as efficient as the hand sorting method and the number of man hours required to process samples by hand was far greater than that required by the Berlese system.
Roberts, S. J.; Bartell, D. P.; and Armbrust, E. J.
"Evaluation of Two Systems Used to Extract Alfalfa Weevil Larvae (Coleoptera: Curculionidae) from Alfalfa Samples,"
The Great Lakes Entomologist: Vol. 12
, Article 3.
Available at: http://scholar.valpo.edu/tgle/vol12/iss2/3