Abundance of parasitoids of Archips argyrospila (Lepidoptera: Tortricidae) in Louisiana

The fruittree leafroller, Archips argyrospila (Walker), was first observed feeding on baldcypress, Taxodium distichum (L.) Richard, in 1983 in southern Louisiana. Since then, a prolonged epidemic has persisted in semi- and permanently flooded forested wetlands encompassing 100,000 ha. Species and ab...

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Bibliographic Details
Published in:Environmental entomology 1998-06, Vol.27 (3), p.726-730
Main Authors: Wei, H.X. (Louisiana State University, Baton Rouge, LA.), Goyer, R.A, Lenhard, G
Format: Article
Language:English
Subjects:
ARCHIPS
ARCHIPS ARGYROSPILUS
Biological and medical sciences
BIOLOGICAL CONTROL
Control
CONTROL BIOLOGICO
DENSIDAD DE LA POBLACION
DENSITE DE POPULATION
Fundamental and applied biological sciences. Psychology
INSECTE NUISIBLE
INSECTOS DANINOS
LOUISIANA
LOUISIANE
LUISIANA
LUTTE BIOLOGIQUE
MORTALIDAD
MORTALITE
MORTALITY
PARASITE
PARASITES
PARASITISM
PARASITISME
PARASITISMO
PARASITOIDE
PARASITOIDES
PARASITOIDS
PARASITOS
PEST INSECTS
Phytopathology. Animal pests. Plant and forest protection
POPULATION DENSITY
Protozoa. Invertebrates
TAXODIUM
TAXODIUM DISTICHUM
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Summary:The fruittree leafroller, Archips argyrospila (Walker), was first observed feeding on baldcypress, Taxodium distichum (L.) Richard, in 1983 in southern Louisiana. Since then, a prolonged epidemic has persisted in semi- and permanently flooded forested wetlands encompassing 100,000 ha. Species and abundance of parasitoids associated with fruittree leafroller on baldcypress were determined at 2 sites in Louisiana during 1994 and 1995. Six species of primary parasitoids were reared from the larvae and pupae of fruittree leafroller. Mortality by all parasitoid species for the combined larval and pupal stages in the 2 seasons was 22.8 and 13.6% at Bayou Pigeon and Norco, respectively. Itoplectis conquisitor (Say) (Hymenoptera: Ichneumonidae) was the most abundant parasitoid and Brachymeria ovata (Say) (Hymenoptera: Chalcidae) ranked second. The rate of parasitism by I. conquisitor for both years averaged 13.8% at Bayou Pigeon and 8.4% at Norco. The eulophid Dimmockia incongrua (Ashmead) (Hymenoptera: Eulophidae) a hyperparasitoid of I. conquisitor. No parasitoids were reared from or found in dissections of egg masses collected in the 2-yr study. Thus, it appears that the absence of egg parasitism and the low levels of larval parasites are responsible in part for allowing populations of the fruittree leafroller to continue at epidemic levels in wetlands in Louisiana
ISSN:0046-225X
1938-2936
DOI:10.1093/ee/27.3.726