Canadian Forest Service Publications
Oviposition trap to sample eggs of Operophtera bruceata (Lepidoptera: Geometridae) and other wingless geometrid species. 1999. Hébert, C.; St-Antoine, L. The Canadian Entomologist 131: 557-565.
Available from: Laurentian Forestry Centre
Catalog ID: 16857
For the last 50 years, populations of the Bruce spanworm, Operophtera bruceata Hulst, and other wingless geometrid species have been sampled using sticky bands placed around host-tree trunks to catch wingless females in search of oviposition sites. This method is tedious and, because of trap saturation by males, may underestimate female populations at moderate to high levels. A standard oviposition trap was developed to sample eggs of the Bruce spanworm and other wingless geometrid species. A small polyurethane foam band placed on a post covered by a Multi-Pher@ plate detected low populations and was almost unsaturable during outbreaks. Subsampling can be easily done in such situations. Egg density on oviposition traps was higher than female density on sticky bands for both the Bruce spanworm and the fall cankerworm, Alsophila pornetaria Harris. This suggests that the oviposition trap might be useful to sample other wingless geometrid species. Operating this system was easy and could involve woodlot owners and companies to reduce the traveling costs necessary to collect samples.
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