Journal of the Entomological Society of British Columbia
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The aphids (Homoptera: Aphididae) of British Columbia 6. Further additions
Get PDFTwenty-four species of aphids and new host records are added to the taxonomic list of the aphids of British Columbia
Consequences of eliminating aerial access samples from surveys of forest defoliators in coastal British Columbia
Get PDFLarval populations of forest defoliators in British Columbia are assessed at least once each year by beating trees at scattered permanent sampling stations. These data are supplemented by additional, randomly selected samples. Most stations are reached by road, but aircraft are used to reach some roadless areas. Recently, to economize, large blocks of aircraft access permanent sampling stations were dropped. To learn how this affected the estimates of overall population numbers, we compared past records determined with and without aerial samples and with and without random samples. The northern mainland coast and the west coast of Vancouver Island were selected as test sites. In most instances, defoliator populations as measured at aerial and ground access permanent sampling stations and by random samples rose and declined together, indicating that estimates of population trend would not be seriously affected by dropping aerial and random samples
The proportion of immature stages of the Rocky Mountain wood tick (Dermacentor andersoni) feeding on artificially infested cattle
Get PDFOnly 2% of <i>D. andersoni</i> larvae engorged when confined in sleeves over clipped areas on or near the tails of two heifers, but percentages were higher in some sleeves. About 13% of nymphs fed when placed in sleeves near the withers of two other heifers. These yields are within 10 percentage points of t hose from two usual laboratory hosts (rabbits and white mice), which suggests that cattle should be examined for larvae and nymphs in the field, since the numbers feeding on them may not always be negligible in relation to disease transmission and maintenance of tick populations
Organic pest control: Two years experience in a commercial apple orchard
Get PDFAn orchard under an organic control program was studied for the incidence of pests during 2 years. Sex pheromone traps were used to control codling moths, <i>Laspeyresia pomonilla</i> (Linnaeus), by removing males. The only pesticides used in the orchard were petroleum oil at the delayed dormant period to suppress the overwintering eggs of the European red mite, <i>Panonychus ulmi</i> (Koch); and <i>Bacillus thuriengiensis</i> to control leafrollers, <i>Archips argyrospilus</i> (Walker), and <i>Archips rosanus</i> (Linnaeus). Leaf and fruit samples were taken for all the major pests which attack apples but the only pests which required treatment were the white apple leafhopper, <i>Typhlocyba pomaria</i> McAtee in 1977 and the codling moth in 1978. The failure to control codling moth may result in the curtailment of the organic program unless supplemental controls can be found
The function of the caudal appendage in cocoon jumping of Phobocampe sp. (Hymenoptera: Ichneumonidae: Campopleginae)
Get PDFEvaluation of diflubenzuron for control of leafrollers (Lepidoptera: Tortricidae) on apple
Get PDFThe toxicity of diflubenzuron (Dimilin) to various stages of the oblique-banded leafroller, <i>Choristoneura rosaceana</i> (Harris), was evaluated under laboratory conditions. The compound had no ovicidal effect at concentrations up to 1000 ppm but foliage treated with 100 ppm diflubenzuron plus the surfactant, Tween 20, was toxic to 1st-instar larvae. At similar concentrations, diflubenzuron reduced the longevity of adult moths but had no effect on fecundity or egg viability. In an orchard of mixed apple cultivars, diflubenzuron cover sprays applied at the pink bud stage significantly reduced fruit damage by leafrollers but failed to provide control comparable to that with azinphos-methyl
Using explosives to destroy mountain pine beetle broods in lodgepole pine trees
Get PDFThe effectiveness of explosives for the destruction of mountain pine beetles in individual lodgepole pine trees was investigated. Two types of detonating cord, and various placements, were tested on infested bolts and trees, and a plastic explosive was tested on bolts. Explosives killed broods directly, and indirectly by habitat disruption. Direct effects extended about 9 cm from the explosion and mortality was inversely related to distance. Indirect effects via extensive loosening and shedding of bark caused far greater mortality than direct effects. On trees, summer and fall treatment was much more effective than spring treatment, regardless of cord placement. Fall treatment using 10 g/m detonating cord helically wrapped onto the boles at 10, 20 and 30 cm spacings caused 100%, 98% and 70% mortality of broods respectively. Generally, vertical placement of the cord into grooves cut through the bark caused more bark disruption and therefore, more brood destruction than did helically wrapped cord placed on the surface
Observations on the biology of Prionus californicus on hops in Idaho
No full textThe damage potential, seasonal flight activity and larval development of <i>Prionus californicus</i> were investigated over five years in Idaho hop yards. Hop plants were not susceptible to oviposition and larval establishment until after their second year. Crowns of severely infested plants were reduced to masses of frass and rotted areas. Major roots were frequently tunneled and girdled. First foliar symptoms were loss of vigor and often one or more wilted and yellowing shoots. Some affected plants died within a few months while others became less vigorous over several years. Two kinds of damage occurred: the first was from larvae that developed within root systems in established yards; the second was root damage to new plantings from larvae left in the soil when the old yard was taken out and replanted to hops. Beetle flight occurred only during July with day-to-day variation at least partially related to minimum temperatures and to precipitation. Young larvae were found almost entirely in the vascular region of roots to a soil depth of about 200 mm. Older larvae were in both living and dead roots to a soil depth of about 500 mm. Based upon measurements of 243 larvae taken from 50 hop root systems, the life cycle of the species is usually 4 years
