J Econ Entomol
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., P.O. Box 300, Sainte-Foy, Quebec, Canada G1V 4C7.
Published: June 2003
Outbreaks of the hemlock looper, Lambdina fiscellaria (Gueneé), are characterized by rapid increase and patchy distribution over widespread areas, which make it difficult to detect impending outbreaks. This is a major problem with this insect. Population forecasting is based on tedious and expensive egg surveys in which eggs are extracted from 1-m branches; careful observation is needed to avoid counting old unhatched eggs of previous year populations. The efficacy of artificial substrates as oviposition traps to sample hemlock looper eggs was tested as a means of improving outbreak detection and population forecasting. A white polyurethane foam substrate (1,095 lb/ft3) used with the Luminoc insect trap, a portable light trap, was highly efficient in sampling eggs of the hemlock looper. Foam strips placed on tree trunks at breast height were less efficient but easier and less expensive to use for the establishment of extensive survey networks. Estimates based on oviposition traps were highly correlated with those obtained from the 1-m branch extraction method. The oviposition trap is a standard, inexpensive, easy, and robust method that can be used by nonspecialists. This technique makes it possible to sample higher numbers of plots in widespread monitoring networks, which is crucial for improving the management of hemlock looper populations.
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http://dx.doi.org/10.1093/jee/96.3.768 | DOI Listing |
Insects
September 2016
Department of Biological Sciences, University of Rhode Island, Kingston, RI 02881, USA.
Eastern hemlock (Tsuga canadensis [L.] Carriére) in the United States is threatened by the invasive hemlock woolly adelgid (Adelges tsugae Annand). The native hemlock looper (Lambdina fiscellaria Guenée) also appears to have played a role in previous population declines of this conifer.
View Article and Find Full Text PDFEnviron Entomol
December 2015
Natural Resources Canada, Canadian Forest Service - Atlantic Forestry Centre, PO Box 4000, Fredericton, NB, E3B 5P7, Canada.
The potential roles of the oral secretions (OS) of spruce budworm (SBW; Choristoneura fumiferana Clemens) larvae and factors that may affect the volume of OS disgorged were investigated in the laboratory. Experiments revealed that diet-fed SBW larvae readily disgorge OS when induced ("milked"), with minimal overall cost to their development and eventual pupal weight. Exposure of conspecific larvae to OS throughout larval development negatively affected survival and male pupal weight; however, male development time was faster when exposed to OS.
View Article and Find Full Text PDFJ Insect Physiol
February 2015
Département des sciences du bois et de la forêt, Faculté de foresterie, de géographie et de géomatique, Pavillon Abitibi-Price, Université Laval, Québec, Québec G1V 0A6, Canada.
The hemlock looper (Lambdina fiscellaria) is an important pest of eastern Canadian forests. The ongoing climate warming could modify the seasonal ecology of this univoltine species that lays eggs at the end of summer and overwinters at this stage. Indeed, the increase in frequency and intensity of extreme climatic events such as fall heat waves could interfere with the winter metabolism of the hemlock looper.
View Article and Find Full Text PDFJ Invertebr Pathol
September 2013
Dept. of Microbiology, Oregon State University, Corvallis, OR 97331-3804, USA.
47 samples from the Martignoni baculovirus collection were characterized by PCR amplification of the lef-8 gene. This led to the identification of sequences from viruses that either were not present in the database, or had been identified, but not further characterized. These included an NPV and a GV from Pseudoletia (Mythimna) unipuncta, and NPVs from Coloradia pandora, the oak and hemlock looper (probably Lambdina sp.
View Article and Find Full Text PDFEnviron Entomol
December 2012
Institut de recherche en biologie végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal, QC, Canada.
We describe seasonal patterns of parasitism by Telenomus coloradensis Crawford, Telenomus droozi Muesebeck, Telenomus flavotibiae Pelletier (Hymenoptera: Scelionidae), and Trichogramma spp. (Hymenoptera: Trichogrammatidae), egg parasitoids of the hemlock looper, Lambdina fiscellaria (Guenée) (Lepidoptera: Geometridae), after a 3-yr survey of defoliated stands in the lower St. Lawrence region (Quebec, Canada).
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