Journal of the Entomological Society of British Columbia
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The distribution of Tanypteryx hageni (Odonata: Petaluridae) in British Columbia
Get PDFIn British Columbia the petalurid dragonfly <i>Tanypteryx hageni</i> (Selys) is considered to be rare. A record in 1977 extends its known range almost to 51°N latitude. The record also disputes the belief that <i>T. hageni</i> normally is restricted to subalpine habitats. In the northern parts of its range it appears to occur naturally at sea level
The mosquitoes of Burnaby Lake, British Columbia
Get PDFTen species were found in a survey of the mosquitoes of the Burnaby Lake area; they included a small breeding population of <i>Aedes aloponotum</i>, a species not recorded in British Columbia since 1919. <i>Aedes aboriginis</i> was more numerous and troublesome. <i>Aedes sierrensis</i> and <i>Mansonia perturbans</i>, which bite both in the open and in houses, were less common, but because they are unaffected by the usual larval control techniques, are potential nuisance species in the area. <i>Aedes cinereus</i> and <i>Culiseta morsitans</i> were abundant, but the former bit only when disturbed and the latter did not bite humans
Aerial spraying for control of the spiral spruce-cone borer, Hylemya anthracina (Diptera: Anthomytidae)
Get PDFWhite spruce (<i>Picea glauca</i> (Moench) Voss) trees were sprayed with dimenthoate; at two sites, trees were treated individually with different types of booms; at a third site, a broadcast spray was applied. The low population densities of the spiral spruce-cone borer, <i>Hylemya anthracina </i>(Czerny), were reduced by 87% and 100% with individual tree sprays and by 68% with a broadcast spray. Increased seed yields were 43% per cones from individually sprayed trees and 22% per cone from the broadcast application
Viruses to control winter moth, Operophtera brumata (Lepidoptera: Geometridae)
Get PDFAn abandoned apple orchard in Victoria, British Columbia, was used to test winter moth nuclear polyhedrosis virus (NPV) in 1979. Concentrations of 10", 107 and 10· polyhedral inclusion bodies (PIB)/ml were applied at the rate of 1 l/tree using a backpack mistblower, soon after the larvae hatched when buds were pre-pink and 8 days later when the buds were full pink. Each treatment was replicated on 6 trees; 6 trees were untreated checks. Best results were with 10" PIB/ml on pre-pink buds which caused 46% population reduction, a statistically significant saving of foliage and high levels of larval infection with both NPV and cytoplasmic polyhedrosis virus (CPV). Both viruses were found in larvae on the check trees and this was attributed to spray drift. The source of the CPV was investiga ted and found to be a contaminant of the NPV suspension in which the ratio of NPV: CPV PIB was 161 : 1. Despite the low level of CPV applied, up to 65% of the larvae were infected. In 1980, a survey to determine levels of infection in winter moth larvae showed no viruses in 5 untreated sites and only 1% NPV and 5% CPV in the treated orchard. The virus treatment did not initiate a continuing epizootic and the effective concentration of lOS PIB/ml was too costly to produce as a biocontrol agent having an impact only in the season of application
The aphids (Homopera: Aphididae) of British Columbia 9. Further additions
Get PDFTen species of aphids and new host records are added to the taxonomic list of the aphids of British Columbia
Native parasites of the larch casebearer, Coleophora laricella (Lepidoptera: Coleophoridae), in the West Kootenay area of British Columbia
No full textThirty-two species of parasites and hyperparasites were reared in 1973 from a total of almost 103.000 larch casebearers, <i>Coleophora laricella</i> (Hbn.) collected at eight locations in the West Kootenay area of British Columbia. The two highest casebearer populations were at Fruitvale and Shoreacres. with densities of 150 and 130 cases per 100 fascicles respectively. The highest incidence of parasitism was 17.7% at Rossland. where the host density was just under 100 cases per 100 fascicles. The <i>Dicladocerus</i> spp. complex comprised 40.7% of the total parasitism and was most abundant at Rossland, Arrow Creek. Christina Lake, Sheep's Creek. and Yahk; <i>Spilchalcis albifrons</i> (Walsh) comprised 23.6% of the total and was the most abundant parasite at Shoreacres, Christina Lake, and Fruitvale; and <i>Bracon pygmaeus</i> (Prov.) comprised 6.8% of the total and was the most abundant parasite at Anarchist Summit
Hylemya antiqua (Meigen): Longevity and oviposition in the laboratory?
Get PDFIn laboratory cultures, some female <i>Hylemya antiqua</i> (Meigen) were still alive and ovipositing after 66 days, whereas males usually survived no longer than 50 days. The average lifespan of 12 individually-reared, reproducing females was 48 days. Oviposition began no earlier than 8 days, and on the average, 10.5 days after the females emerged. Heavy oviposition by most females was cyclic, occurring every other day. The mean fecundity/female in 3 cultures was 259.2, 114.5 and 218.4, respectively, but for individually-reared females, it was 491.5. Variations in diet and environment probably lead to poor or inconsistent correlation of laboratory data on longevity and fecundity with actual events in the field. However, these data provide precise guidelines for utilization of <i>H. antiqua</i> in laboratory experiments
Oviposition deterrents for Aedes aegypti in extracts of Lemna minor
Get PDFDual choice bioassays demonstrated that water and methanolic extracts of <i>Lemna minor</i> L., in aqueous solution, deterred oviposition by <i>Aedes aegypti</i> L. The methanolic extracts were active at concentrations of 1000 and 10,000 PPM but were inactive at 1, 10, and 100 PPM. Pentane extracts and L. minor culture water showed no activity. None of the extracts bioassayed were biologically active against <i>Culex pipiens</i> L. Experiments in which physical contact with the extracts was prevented, provide evidence that a volatile chemical emanating from the extract is responsible for the deterrency