parasitism of obliquebanded leafroller (lepidoptera: tortricidae) in commercially managed michigan apple orchards.the obliquebanded leafroller, choristoneura rosaceana (harris), is one of the major arthropod pests of apple in the united states. in 1999 and 2000, a survey of the obliquebanded leafroller parasitoid complex in commercially managed apple orchards in michigan's two largest fruit production regions was conducted to determine the species present and their importance to obliquebanded leafroller population management. in total, 8,961 obliquebanded leafroller larvae were collected of which 2,174 were ...200415568339
implicating an introduced generalist parasitoid in the invasive browntail moth's enigmatic demise.recent attention has focused on the harmful effects of introduced biological control agents on nontarget species. the parasitoid compsilura concinnata is a notable example of such biological control gone wrong. introduced in 1906 primarily for control of gypsy moth, lymantria dispar, this tachinid fly now attacks more than 180 species of native lepidoptera in north america. while it did not prevent outbreaks or spread of gypsy moth, we present reanalyzed historical data and experimental findings ...200617089674
preoutbreak dynamics of a recently established invasive herbivore: roles of natural enemies and habitat structure in stage-specific performance of gypsy moth (lepidoptera: lymantriidae) populations in northeastern wisconsin.a major challenge to addressing biological invasions is that the need for emergency responses often precludes opportunities to analyze the dynamics between initial establishment and population eruption. thus, a broader understanding of underlying processes and management opportunities is often lacking. we examined the effects of habitat structure and natural enemies on recently established preeruptive gypsy moth, lymantria dispar l., populations over 4 yr in northeastern wisconsin. forty-five si ...200819036196
introduced pathogens follow the invasion front of a spreading alien host.1. when an invasive species first colonizes an area, there is an interval before any host-specific natural enemies arrive at the new location. population densities of newly invading species are low, and the spatial and temporal interactions between spreading invasive species and specific natural enemies that follow are poorly understood. 2. we measured infection rates of two introduced host-specific pathogens, the entomophthoralean fungus entomophaga maimaiga and the baculovirus lymantria dispar ...201121644978
effect of the entomogenous nematode nemplectana carpocapsae on the tachinid parasite compsilura concinnata (diptera: tachinidae).the entomogenous nematode neoaplectana carpocapsae and its associated bacterium, xenorhabdus nematophilus, could not infect the pupal stage of the tachinid compsilura concinnata through the puparium. n. carpocapsae had an adverse effect on 1-, 2- and 3-day-old c. concinnata larvae within the armyworm host in petri dish tests. all 1-day-old larvae treated with nematodes died in their hosts, whereas 61% and 69% of 2- and 3-day-old larvae treated with nematodes, respectively, died. however, the sur ...198419295866
foliar quality influences tree-herbivore-parasitoid interactions: effects of elevated co2, o3, and plant genotype.this study examined the effects of carbon dioxide (co2)-, ozone (o3)-, and genotype-mediated changes in quaking aspen (populus tremuloides) chemistry on performance of the forest tent caterpillar (malacosoma disstria) and its dipteran parasitoid (compsilura concinnata) at the aspen free-air co2 enrichment (face) site. parasitized and non-parasitized forest tent caterpillars were reared on two aspen genotypes under elevated levels of co2 and o3, alone and in combination. foliage was collected for ...200312898383
new tachinidae (diptera) host records of eastern north american forest canopy lepidoptera: baseline data in a bacillus thuriengiensis variety kurstaki nontarget study.macrolepidopteran caterpillars collected in 1995 and 1996 in the monongahela national forest, pocahontas county, wv, and the george washington national forest, augusta county, va, yielded 60 previously unreported tachinid host associations. most associations were between native species, but the introduced polyphagous tachinid compsilura concinnata (meigen) produced eight new associations with native hosts. the tachinids collected were slightly broader in their host preferences than associated br ...200111681675
are pollinating hawk moths declining in the northeastern united states? an analysis of collection records.increasing attention to pollinators and their role in providing ecosystem services has revealed a paucity of studies on long-term population trends of most insect pollinators in many parts of the world. because targeted monitoring programs are resource intensive and unlikely to be performed on most insect pollinators, we took advantage of existing collection records to examine long-term trends in northeastern united states populations of 26 species of hawk moths (family sphingidae) that are pres ...201728982152
the failure to discriminate: superparasitism of trichoplusia ni hübner by a generalist tachinid parasitoid.parasitoids are dependent on their hosts, which provide all of the resources for larval development. parasitoid fitness, therefore, is directly related to the host quality, as determined by host size, age and health (e.g. parasitisation status); and this can only be assessed by the female parasitoid during host selection. most studies of parasitoid-host interactions have focused on hymenopteran parasitoids rather than dipterans that are believed to be less discriminating during host selection. w ...201019586578
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