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J Econ Entomol

Title:		Bivariate Pheromone-based Monitoring of Spruce Budworm Larvae (Lepidoptera: Tortricidae)
Author(s):		Rhainds M; Therrien P; Morneau L; LeClair G;
Address:		"Natural Resources Canada, Canadian Forest Service - Atlantic Forestry Centre, Fredericton, New Brunswick, Canada. Ministere des Forets, de la Faune, et des Parcs, Direction de la Protection des Forets, Service de la Gestion des Ravageurs Forestiers, Quebec (Quebec), Canada"
Journal Title:		J Econ Entomol
Year:		2018
Volume:		111
Issue:		1
Page Number:		277 - 282
DOI:		10.1093/jee/tox331
ISSN/ISBN:		1938-291X (Electronic) 0022-0493 (Linking)
Abstract:		"A bivariate approach to pheromone-based monitoring is developed for the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). The approach uses captures of males at pheromone traps for generation t (male symbolt) as a transitive term between densities of overwintering larvae in consecutive generations (L2t, L2t+1), based on a large data set including >2,000 observations in the province of Quebec (QC) between the interval 1992 and 2010. Although estimates of L2t and male symbolt are autocorrelated to some extent, multi-year assessments of larval densities combined with pheromone trapping are justified by the complementarity (statistical significance) of both L2t and male symbolt in predicting L2t+1 for 15 of 18 pairs of 2-yr intervals. Bivariate pheromone-based thresholds (number of males corresponding to specific transitions in larval densities between L2t and L2t+1) are reported for each year. As expected, thresholds for stable populations (L2t = L2t+1) were lower than for populations with positive growth rate (L2t < L2t+1). The thresholds derived in this study have limited heuristic value; however, because they vary greatly from year to year"
Keywords:		Animals Larva/drug effects/physiology Male Moths/drug effects/growth & development/*physiology Pheromones/*pharmacology Population Dynamics Quebec eruptive population dynamics forest defoliator multivariate function pheromone quality control pheromone-bas;
Notes:		"MedlineRhainds, Marc Therrien, Pierre Morneau, Louis Leclair, Gaetan eng England 2017/12/23 J Econ Entomol. 2018 Feb 9; 111(1):277-282. doi: 10.1093/jee/tox331"