Journal of the Entomological Society of British Columbia
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Larval diapause in Dendroctonus obesus (Mannerhaim)(Coloeoptera: Scolytidae)
Get PDFi>Dendroctonus obesus</i> (Mannerheim) larvae diapaused in the last instar during laboratory rearing with warm thermoperiods reduced to 12 bours or less, mean temperatures of 50∞-56∞F. (10∞-13.3∞C) and at least one minimum subcortical temperature near or below the larval development threshold during the third and fourth instars. Larvae reared at a constant temperature of 70∞F (21.1∞C) did not diapause. Prediction of beetle populations and forest damage is dependent on a knowledge of the seasonal meteorological conditions that affect larval dispause and subsequently the numbers of mature beetles capable of initiating attacks. Further investigation is required to determine the separate effects of brood age, temperatures and thermoperiods on diapause
Observations on Eriocampa ovata L. (Hymenoptera: Tenthredinidae) infesting red alder in southwestern British Columbia
Get PDFAs in Quebec, <i>Eriocampa ovata</i> L. in British Columbia is bivoltine, parthenogenetic and overwinters as a prepupa. Unlike <i>E. ovata</i> in Quebec, the first instar larvae emerge on the lower side of the leaf, and pass through 6 or 7 rather than 5 or 6 larval instars. Defoliation characteristically leaves only the midrib and main secondary veins. In limited areas, small trees may be completely defoliated
Native hosts of western cherry fruit fly (Diptera: Tephritidae) in the Okanagan Valley of British Columbia
No full textIn the Okanagan Valley, bitter cherry, <i>Prunus emarginata</i> Dougl., the principal host of the western cherry fruit fly, <i>Rhagoletis indifferens</i> Curran, was found at 3 locations only but may occur elsewhere in the Okanagan Valley in restricted habitats. The rare occurrence and unreliable fruiting habit indicate its existence is marginal. Adult <i>R. indifferens</i> were trapped on this host even though no fruit was present. This indicates that bitter cherry and probably, the less preferred native host, western choke cherry, <i>P. virginiana</i> var <i>demissa</i> (Nutt.) Torr., are both important to the ecology of isolated, low, endemic populations of <i>R. indifferens</i> in the central and possibly northern Okanagan Valley. No instances were found where endemic populations of <i>R. indifferens</i> on native hosts might have formed a host strain adapted to the earlier maturing, introduced, cultivated cherries. Widespread infestations of this pest have adapted to development on cultivated sweet and semi-sweet cherries and appear to be a recently introduced race that is distinct from the endemic populations on native hosts. <i>R. indifferens</i> on cultivated cherries had an earlier emergence peak that those on the native hosts and were not associated with the presence of bitter cherry
The Beetles of the Pacific Northwest, Part V: Rhipiceroidea, Sternoxi, Phytophaga, Rhyncophora, and Lamellicornia, by Melville H. Hatch
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The aphids (Homoptera: Aphididae) of British Columbia. 1. A basic taxonomic list
Get PDFA list is presented of 213 species of aphids collected from 255 hosts or in traps in British Columbia
Codling moth importation control by sterile insect release: Of fruit and fruit containers as a source of reinfestation
Get PDFA program of codling moth, <i>Laspeyresia pomonella</i> (L.), control by the sterility principle is planned for the entire Similkameen Valley of British Columbia. If the program is successful, reinfestation by moth fly-in is unlikely because the valley is fairly well isolated. Importation of host fruits and fruit containers (bushel boxes) for roadside fruit stands could lead to reinfestation unless the boxes are fumigated. Localized annual releases of sterile moths around fruit stands may also be necessary. Orchard bins, used by commercial packinghouses, are unlikely to be a serious source of codling moth reinfestation
Cone and seed insects of subalpine fir during a year of low cone production in northern Idaho
Get PDFCone and seed insects destroyed 29 percent of the seed crop of subalpine fir (<i>Abies lasiocarpa</i>) in the Freezeout Mountain area of northern Idaho in 1972 during a year of low cone production. Larvae of a coneworm, <i>Dioryctria abietivorella</i> destroyed 12 percent of the seed crop, accounting for 42 percent of the total insect damage. A newly discovered midge pest, a species of <i>Dasineura</i>, destroyed 11 percent of the seed crop, amounting to 40 percent of the total insect damage. The dipterans, <i>Hylemya abietis</i>, <i>Earoymia</i> sp., and <i>Asynapta keeni</i>, and the chalcid wasp, <i>Megastigmus lasiocarpae</i>, together destroyed 4 percent of the seed crop. Unknown causes accounted for 1.5 percent of the total seed destruction. X-ray was used to estimate seed lost to <i>M. lasiocarpae</i> and <i>Dasineura</i> sp. Regression equations are given relating cone length (mm), and the seeds on the axial surface, to total seeds. Sound and damaged seeds on the axial surface were highly correlated with the totals of sound and damaged seeds, respectively, in the cone
Furrow application of insecticide as a method of controlling wireworms in potato land
Get PDFThree methods of applying insecticides for the control of the wireworm, <i>Agriotes obscurus</i> L.. were tested using fonofos and terbufos. Most treatments gave significantly more marketable tubers than the control. The furrow treatment gave more consistent results than broadcast or side-dress and, at 1.1 or 2.2 kg a.i/ha, gave control equal to, or better than, the broadcast treatment at 5.6 kg a.i./ha. Analyses by gas chromatography using a flame photometric detector for residues in potatoes grown in treated soil showed residues to be less than 0.02 ppm