Canadian Forest Service Publications

Formicide predators of the sawfly Neodiprion swainei Midd. 1974. Ilnitzky, S. s.n., S.l. Rapport d'information LAU-X-8. 14 p.

Year: 1974

Issued by: Laurentian Forestry Centre

Catalog ID: 15381

Language: English

Series: Information Report (LFC - Qu├ębec)

Availability: PDF (download)

Mark record


This study was made to determine species distribution, population level and predation of ants on Neodiprion swainei Midd. in a young jack pine (Pinus banksiana Lamb.) stand in Quebec. Formica fusca L. was the most abundant of 10 ant species in the study area. Formica fusca, F. sanguinea subnuda Emery, Formica spp. (Rufa group), Formica sp., and Camponotus herculeanus (L.) carried emerging and ovipositing adults, and sound and empty cocoons of N. swainei into their nests. F. fusca did not attack sawfly larvae in the trees. Ants preferred adult sawflies over sound or empty cocoons. Adult sawflies and cocoons were found in ant nests, tunnels, and rearing chambers 9 to 18 cm below the soil surface, and a few cocoons were found as deep as 41 cm. The studies showed that ants may be an important biological factor in jack pine sawfly populations.