A technique for the extraction of cocoons from soil samples during population studies of the Swaine sawfly, Neodiprion swainei Midd. (Hymenoptera: Diprionidae)
Canad. Ent, Ottawa 93(10): 888-890
A washing technique for the extraction of cocoons of Neodiprion swainei (Middleton) from soil samples was devised in Quebec in 1960 and is described. Samples of soil from areas of 1 sq.ft. of the forest floor were placed in containers, made by hinging together two frames 20 in. square placed one on the other, with the top and bottom each consisting of a layer of 14-mesh screen (which retains particles of cocoon size or more) supported by a contiguous outer layer of eight-mesh screen.