Canadian Forest Service Publications
Polyurethane foam strips to estimate parasitism of hemlock looper (Lepidoptera; Geometridae) eggs by Telenomus spp. (Hymenoptera: Scelionidae) 2006. Hébert, C.; Berthiaume, R.; Bordeleau, C. Can. Entomol. 138: 114-117.
Issued by: Laurentian Forestry Centre
Catalog ID: 26295
Availability: PDF (request by e-mail)
An oviposition trap recently developed to survey hemlock looper (Lambdina fiscellaria (Guenée)) eggs and consisting of a small strip of white polyurethane foam stapled to the tree bole provides reliable estimates of Telenomus spp. parasitism on hemlock looper eggs. Oviposition traps are a standard tool that never varies. They allow us to avoid the tedious and expensive extraction process used when collecting eggs from branches. This new method can be implemented rapidly in a high number of plots and provides the egg parasitism estimates needed in spring to improve hemlock looper population management.