A5026541557- Forest Insect Ecology and Management
- Insect-Plant Interactions and Control
- Fire effects on ecosystems
- Insect and Pesticide Research
- Forest Ecology and Biodiversity Studies
- Entomological Studies and Ecology
- Lepidoptera: Biology and Taxonomy
- Plant and animal studies
- Forest ecology and management
- Insect Pheromone Research and Control
- Ecology and Vegetation Dynamics Studies
- Hemiptera Insect Studies
- Insect Resistance and Genetics
- Tree-ring climate responses
- Insect and Arachnid Ecology and Behavior
- Planetary Science and Exploration
- Atmospheric and Environmental Gas Dynamics
- Hymenoptera taxonomy and phylogeny
- Environmental Impact and Sustainability
- Phase Equilibria and Thermodynamics
- Plant Parasitism and Resistance
- Biofuel production and bioconversion
- Process Optimization and Integration
- Thermochemical Biomass Conversion Processes
- Tree Root and Stability Studies
Société de Protection des Forêts contre les Insectes et Maladies
2022-2024
Université Laval
2009-2022
Centre de Géomatique du Québec
2014-2018
University of Ontario Institute of Technology
2017
Natural Resources Canada
2001-2006
Canadian Forest Service
2001-2006
Ministère des Transports
1999
Budburst is a pivotal event in plant life, representing crucial response to seasonal meteorological shifts. Boreal tree species exhibit species-specific phenologies, and the rate of phenological changes under warming conditions may differ among these species. In this study we aim investigate timing budburst three coniferous [Balsam fir (Abies balsamea), black spruce (Picea mariana) white glauca) (Pinaceae)]; identify main drivers budburst, its advance spatiotemporal patterns relation climate...
Exergy analysis permits accurate measurement of the degradation matter and energy using a single concept. A macroscopic exergy accounting method is proposed applied to assess environmental impact road covering material manufacturing. Cement concrete asphalt covers are examined. From manufacturing process mass balances analyses conducted primarily by Szargut his co-workers, net consumption for each type paving calculated. This broadly reflects minimum work required reform raw materials...
Abstract 1 Feeding behaviours, and lethal sublethal (growth, development food utilization) effects of Foray 48B, a commercial formulation Bacillus thuringiensis (kurstaki) , were investigated on fourth‐ sixth‐instar spruce budworm larvae according to nutritive quality. Nitrogen soluble sugar content artificial diets modified obtain three different qualities food, simulating variations in quality host tree. 2 Larval times longer for Bt ‐treated pupal weights reduced only. ‐induced mortality...
BACKGROUND: Spruce budworm, Choristoneura fumiferana (Clem.), causes cumulative defoliation and hence annual growth loss of the balsam fir, Abies balsamea (L.) Mill, host tree. Annual increments mixed fir stands were measured by stem analysis over a 9 year period (1994–2002), when Bacillus thuringiensis ssp. kurstaki (Btk) was applied to control spruce budworm defoliation. With this approach, it possible quantify change in stand volume after aerial spray applications Btk. RESULTS:...
The debate about mechanisms underlying the evolution of host specialization by herbivorous insects remains open. Natural selection may act locally and lead to different patterns geographic variation in life history traits polyphagous herbivores. hypothesis genetically-based trade-offs offspring performance on hosts has been proposed but this rarely demonstrated. Under laboratory conditions, biological two populations hemlock looper Lambdina fiscellaria (Guenée), a highly lepidopteran, was...
The whitespotted sawyer, Monochamus scutellatus (Say) (Coleoptera: Ce-rambycidae), is one of the most damaging wood-boring insects in recently burned boreal forests North America. In Canada, salvage logging after wildfire contributes to maintaining timber volume required by forest industry, but larvae this insect cause significant damage that reduces economic value lumber products. This study aimed estimate progression as a function temperature black spruce (Picea mariana (Miller) Britton,...
Forest protection against eastern spruce budworm, Choristoneura fumiferana (Clemens), relies on aerial applications of Bacillus thuringiensis (Btk). However, Btk prescriptions have been developed for balsam fir (Abies balsamea (L.) Mill.) stands, generating uncertainty as to the relevance this approach white (Picea glauca (Moench) Voss). The main goal study was evaluate efficacy three application treatments (early application, late and double application) protecting in mixed stands. Our...
Abstract Key message Aerial application of Bacillus thuringiensis Berliner var. kurstaki (Btk) every second year to stands white spruce ( Picea glauca (Moench)Voss.), black mariana Mill.) and balsam fir Abies balsamea (L.) is the most cost-effective spraying scenario for reducing impact budworm Choristoneura fumiferana Clemens) on wood production, providing a similar level forest protection, but at lower cost, standard currently used in which 50% current year’s foliage protected year....
Abstract Many herbivorous insects emerge synchronously with budburst of their host plant, as the nutritional quality foliage often decreases rapidly following budburst. We carried out manipulative field experiments to evaluate influence bud and shoot phenology on performance hemlock looper, Lambdina fiscellaria Guenée (Lepidoptera: Geometridae: Ourapterygini), balsam fir, Abies balsamea (L.) Mill. (Pinaceae), in NF, Canada. Hemlock looper survival, pupal weight, realized fecundity, which...
Silvicultural treatments such as thinning have been suggested management tools against the spruce budworm, Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae). Among other things, parasitoids are also proposed to be influenced by silvicultural procedures, but effect of on budworm's natural enemies has not tested yet. In this study, influence partial cutting parasitism endemic budworm populations investigated in mature balsam fir-white birch forests. Two intensities (25 and 40%...
The hemlock looper, Lambdina fiscellaria , pupal distribution was studied through a 3-year outbreak cycle near Lac Princeton on Anticosti Island in Quebec. Over the 3 years, 10 balsam fir trees were cut and all pupae counted stem branches (non-foliated vs foliated parts) of lower, middle upper crowns below crown. In pre-outbreak conditions, mostly found crowns. During outbreak, density did not increase these parts trees, since stem, from ground to crown, lower Few portion post-outbreak...
We describe seasonal patterns of parasitism by Telenomus coloradensis Crawford, droozi Muesebeck, flavotibiae Pelletier (Hymenoptera: Scelionidae), and Trichogramma spp. Trichogrammatidae), egg parasitoids the hemlock looper, Lambdina fiscellaria (Guenée) (Lepidoptera: Geometridae), after a 3-yr survey defoliated stands in lower St. Lawrence region (Quebec, Canada). Results from sentinel trap sampling indicate that T. are most common species, whereas is rare. show similar periods parasitism,...
Journal Article Population Collapses in a Forecasted Outbreak of Lambdina fiscellaria (Lepidoptera: Geometridae) Caused by Spring Egg Parasitism Telenomus spp. (Hymenoptera: Scelionidae) Get access Christian Hébert, Hébert 1Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., P.O. Box 3800, Sainte-Foy, QC, G1V 4C7. Search for other works this author on: Oxford Academic PubMed Google Scholar Richard Berthiaume, Berthiaume Alain Dupont, Dupont...
The hemlock looper [Lambdina fiscellaria (Guenée)], a widespread and highly polyphagous Geometridae, is considered one of the most economically important defoliators North American coniferous forests. Variations in number larval instars between geographic populations this species have been previously reported literature. However, whether such developmental polymorphism occurs within given population unknown. In study, we report presence both four five instar individuals Newfoundland when...
After fire, the whitespotted sawyer, Monochamus scutellatus (Say) (Coleoptera: Cerambycidae), is considered one of most damaging xylophagous insects by forest industries in eastern boreal North America. Although this species often opportunistic because it dwells on various stressed host trees, can be found very high abundance after fire and, consequently, has been suspected being a pyrophilous or fire-associated species. The aim study was first to determine whether sawyer lays eggs...
Abstract The ecology and management of boreal forest ecosystems are drawing greater attention worldwide as their importance is being increasingly recognized for carbon sequestration or harbouring the world's largest remaining intact forests. Selection cuts have been introduced a more socially acceptable silvicultural method to improve maintenance habitat structure functions they mimic aspects succession dynamics. Many studies shown that selection cutting helps maintaining arthropod...
This study aimed to characterize the vertical distribution of longhorned beetle larvae in burned trees eastern Canadian boreal forest. Black spruce (Picea mariana (Mill.) Britton, Sterns & Poggenb.) and jack pine (Pinus banksiana Lamb.) at three severity levels were cut, 30 cm boles collected from ground up a height 9.45 m. Boles debarked dissected collect insect larvae. Results show that most abundant species vertically segregated among black trees, but section having highest timber...
The exotic coccinellid Harmonia axyridis (Pallas) recently expanded its range into eastern Canada and elsewhere in North America. We hypothesized that this should be less well adapted to the prey Mindarus abietinus Koch. on balsam fir trees than native Anatis mali (Say), which evolved close association with aphids conifers compared, under field conditions, use by both species collecting data their synchrony M. abietinus, searching predation behaviors, life stage distribution canopy, overall...