Canadian Forest Service Publications
Timing of insecticide application against spruce budworm (Choristoneura fumiferana (Clem.)) in relation to larval development and progressive damage to foliage of balsam fir (Abies balsamea (L.) Mill.) 1977. Blais, J.R. s.n., S.l. Information Report LAU-X-27. 18 p.
Issued by: Laurentian Forestry Centre
Catalog ID: 16305
Series: Information Report (LFC - Québec)
Availability: PDF (download)
Studies were conducted in 4 study plots in 1976 to determine feeding behaviour and progressive damage to balsam fir throughout the feeding stage of the spruce budworm. Even at high populations defoliation by young larvae was not too serious. Therefore, insecticides could be applied at peak third instar rather than at pre-needle and pre-bud mining stages.