Research Interests:
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
ABSTRACT
Research Interests:
... 28 Dineen Drive, Fredericton, New Brunswick E3B 6C2, CanadaPhone: (506) 447-3339; Fax: (506) 453-3538; chris.hennigar@unb ... Dead trees were not assessed for defoliation and were identified by examining discoloration and dryness... more
... 28 Dineen Drive, Fredericton, New Brunswick E3B 6C2, CanadaPhone: (506) 447-3339; Fax: (506) 453-3538; chris.hennigar@unb ... Dead trees were not assessed for defoliation and were identified by examining discoloration and dryness under sections of bark (MacLean and ...
Research Interests:
The pale-winged gray moth, Iridopsis ephyraria (Walker), a native geometrid moth species found across eastern North America, has recently caused severe defoliation of eastern hemlock trees, Tsuga canadensis (L.) Carrière, in south-central... more
The pale-winged gray moth, Iridopsis ephyraria (Walker), a native geometrid moth species found across eastern North America, has recently caused severe defoliation of eastern hemlock trees, Tsuga canadensis (L.) Carrière, in south-central Nova Scotia, Canada. Field studies were carried out to develop sampling techniques that could be used to predict subsequent defoliation of mature hemlocks, which are too large to sample by conventional methods. Densities of newly emerged, first-instar larvae, estimated by sticky tape traps, explained 77% of the subsequent current-year shoot defoliation by I. ephyraria. Egg densities from foam oviposition traps and mid-instar larval densities from beating sheets were weakly and usually non-significantly related to defoliation. Therefore, foam oviposition traps could be used to qualitatively estimate egg densities of I. ephyraria, but first-instar larvae must be sampled with sticky tape if accurate predictions of hemlock defoliation are desired.
Research Interests: Forest Ecology And Management, Density, Lepidoptera, North Eastern North America Archaeology, Biological Sciences, and 15 moreDefoliation, Methods, Sampling, Environmental Sciences, Sampling design, Nova Scotia, Field Study, Sampling strategy, Maturity, Sampling Technique, Tsuga Canadensis, Moth, Hemlock, Density Defoliation, and Eastern Hemlock
Research Interests:
ABSTRACT Using field surveys, we established sampling procedures for estimating defoliation resulting from elm spanworm, Ennomos subsignaria (Hübner) (Lepidoptera: Geometridae), feeding on mature sycamore maple, Acer pseudoplatanus L.... more
ABSTRACT Using field surveys, we established sampling procedures for estimating defoliation resulting from elm spanworm, Ennomos subsignaria (Hübner) (Lepidoptera: Geometridae), feeding on mature sycamore maple, Acer pseudoplatanus L. (Aceraceae), in St. John's, Newfoundland and Labrador. We also determined whether densities of E. subsignaria eggs, egg masses, early- or late-instar larvae could predict the amount of defoliation at the end of the larval feeding period. Defoliation estimates acquired by sampling branches from only the lower, mid or upper crown explained ≥80% of the variation in tree-level defoliation, suggesting that density–defoliation relationships established using defoliation data from any crown level would also be useful for predicting tree-level defoliation. In linear regressions, egg and egg mass densities explained ≤20% of variation in defoliation and thus only provide a crude relative estimate of the amount of defoliation that will occur. Early- and late-instar larval density in the lower crown explained 53 and 29%, respectively, of the variation in defoliation in the lower crown, where defoliation levels were highest. Thus monitoring early-instar density in the lower crown should provide pest managers with reliable information for decisions regarding whether to apply suppression tactics while allowing enough time to implement these tactics, if necessary.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Page 1. Evidence of an Oviposition-Deterring Pheromone in the Alfalfa Blotch Leafminer, Agromyza frontella (Rondani) (Diptera: Agromyzidae)l JEREMY N. McNEIL AND DAN T. QUIRING Departement de Biologie, Universite Laval, Quebec, PQ GlK... more
Page 1. Evidence of an Oviposition-Deterring Pheromone in the Alfalfa Blotch Leafminer, Agromyza frontella (Rondani) (Diptera: Agromyzidae)l JEREMY N. McNEIL AND DAN T. QUIRING Departement de Biologie, Universite Laval, Quebec, PQ GlK 7P4, Canada Environ. ...
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
Research Interests:
Proceedings : IUFRO Kanazawa 2003 "Forest Insect Population Dynamics and Host Influences"., Scedule:14－19 September 2003, Vemue: Kanazawa Citymonde Hotel, Kanazawa, Japan, Joint metting of IUFRO working groups : 7.01.02 Tree... more
Proceedings : IUFRO Kanazawa 2003 "Forest Insect Population Dynamics and Host Influences"., Scedule:14－19 September 2003, Vemue: Kanazawa Citymonde Hotel, Kanazawa, Japan, Joint metting of IUFRO working groups : 7.01.02 Tree resistance to Insects | 7.03.06 Integrated management of forset defoloating insects | 7.03.07 Population dynamics of forest insects, Sponsored by: IUFRO-J | Ishikawa Prefecture | Kanazawa City | 21st-COE Program of Kanazawa University, Editors: Kamata, Naoto | Liebhold, Nadrew M. | Quiring, Dan T. | Clancy, Karen M.
Page 1. Evidence of an Oviposition-Deterring Pheromone in the Alfalfa Blotch Leafminer, Agromyza frontella (Rondani) (Diptera: Agromyzidae)l JEREMY N. McNEIL AND DAN T. QUIRING Departement de Biologie, Universite Laval, Quebec, PQ GlK... more
Page 1. Evidence of an Oviposition-Deterring Pheromone in the Alfalfa Blotch Leafminer, Agromyza frontella (Rondani) (Diptera: Agromyzidae)l JEREMY N. McNEIL AND DAN T. QUIRING Departement de Biologie, Universite Laval, Quebec, PQ GlK 7P4, Canada Environ. ...
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT Since its introduction from Europe, balsam woolly adelgid [Adelges piceae (Ratzeburg) (Hemiptera: Adelgidae)], a phloem-sap feeder, has spread throughout the balsam fir [Abies balsamea L. (Mill.)] forests of eastern Canada. Trees... more
ABSTRACT Since its introduction from Europe, balsam woolly adelgid [Adelges piceae (Ratzeburg) (Hemiptera: Adelgidae)], a phloem-sap feeder, has spread throughout the balsam fir [Abies balsamea L. (Mill.)] forests of eastern Canada. Trees under A. piceae attack develop “gout” and differ from unattacked trees in physiology, morphology, growth, and chemistry. The native and eruptive eastern spruce budworm [Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae)] also attacks fir, causing severe defoliation during outbreaks. While balsam woolly adelgid and budworm feed at different times and on different host tissues, such spatiotemporally separated herbivores may still interact via host-mediated indirect effects. We examined the relationship between gout and the performance of developing budworm larvae in balsam fir dominated stands in western Newfoundland. We tested for adelgid–budworm interactions in unthinned and precommercially-thinned (∼20 years past) stands, because the host’s growing condition can affect foliage composition and herbivore performance.
Research Interests:
ABSTRACT The balsam woolly adelgid (Adelges piceae) is a gout-inducing hemipteran native to the silver fir forests of Europe. Introduced to eastern North America approximately 100 years ago, it is now found in most balsam fir forests in... more
ABSTRACT The balsam woolly adelgid (Adelges piceae) is a gout-inducing hemipteran native to the silver fir forests of Europe. Introduced to eastern North America approximately 100 years ago, it is now found in most balsam fir forests in Atlantic Canada. When A. piceae feed, they trigger a reaction in the host branch that alters both xylem and phloem morphology. We conducted a field survey to examine the relationship between A. piceae gout density and balsam fir foliar chemistry and shoot growth in naturally unthinned and precommercially thinned stands. A. piceae gout density negatively affected branch growth and was related to changes in the chemistry of older, but not current-year foliage. Older foliage experienced decreases in camphene and bornyl acetate, while foliar concentrations of camphene, myrcene, phenolics, potassium and water differed between thinned and unthinned stands. Foliar chemistry was also influenced by interactions between thinning and A. piceae gout density in old foliage. This study suggests that changes in balsam fir associated with A. piceae gout density may force native defoliators that feed in highly gouted trees to adapt to diets of different chemical compositions and that thinning may alter these interactions.
Research Interests:
... 27(4): 877-884 (1998) ABSTRACT A 2-yr field study was carried out to determine if adult female cone maggots, Stro-bilomyia neanthmcina Michelsen and Strobilomyia appalachen.lli Michelsen, oviposit preferentially on longer rather than... more
... 27(4): 877-884 (1998) ABSTRACT A 2-yr field study was carried out to determine if adult female cone maggots, Stro-bilomyia neanthmcina Michelsen and Strobilomyia appalachen.lli Michelsen, oviposit preferentially on longer rather than shorter cones ofwhite spruce [Picea ...
Research Interests:
Page 1. Intraspecific Larval Competition Reduces Efficacy of Oviposition-Deterring Pheromone in the Alfalfa Blotch Leafminer, Agromyza frontella (Diptera: Agromyzidae) DANIEL T. QUIRING ANDJEREMY N. MCNEIL Departement ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT Trees in an urban forest are highly valued because they have esthetic appeal, provide shade, and improve air quality. During the past 5 yr (2002-2006) in St. John's, Newfoundland and Labrador, Canada, the elm spanworm,... more
ABSTRACT Trees in an urban forest are highly valued because they have esthetic appeal, provide shade, and improve air quality. During the past 5 yr (2002-2006) in St. John's, Newfoundland and Labrador, Canada, the elm spanworm, Ennomos subsignaria (Hübner) (Lepidoptera: Geometridae), has reached outbreak densities. Each year, hundreds of trees have been completely defoliated, and many more trees have been partially defoliated. Adding to this problem, the larvae, their silk strands, and their frass are a considerable nuisance to property owners in areas of high larval densities. In this study, we evaluated the efficacy of three doses of bole-implanted acephate (AceCap 97) for reducing densities and associated defoliation of E. subsignaria on sycamore maple, Acer pseudoplatanus L. (Aceraceae). During the treatment year (2005), all three doses significantly reduced E. subsignaria larval and pupal density; full or two-thirds doses significantly reduced defoliation compared with control trees. During the posttreatment year (2006), bole-implanted acephate did not affect E. subsignaria egg mass density, survival (= adult emergence), or defoliation. Bole-implanted acephate is an effective and practical way of suppressing E. subsignaria densities and herbivory in an urban forest where the protection of high-value trees and the reduction of environmental contamination are of utmost importance.
Research Interests:
Research Interests:
ABSTRACT