Journal of the Entomological Society of British Columbia
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Integrated control of the fruit-tree leaf roller, Archips argyrospilus (Walker), and the eye-spotted bud moth, Spilonota ocellana (Denis & Schiffermuller)
No full textPre-bloom sprays to control the fruit-tree leafroller, <i>Archips argyropilus</i> (Walker), and the eye-spotted bud moth, <i>Spilonota ocellana</i> (Denis & Schiffermuller), were applied in an apple orchard where no insecticides have been used for 6 years. The phytophagous mites in the orchard are held under control by predacious phytoseiid mites. Azinphos-methyl at 5 and 2 1/2 lb. 25% W.P. per acre gave excellent control of the two insects when applied at the pre-pink stage. Dormant oil at 6 gal. per acre applied at the l/2-inch green stage was ineffective. Oil at 6 gal. and azinphos-methyl at 2 1\2 lb. did not reduce predacious phytoseiid mites over the untreated control. No phytoseiid mites were found on trees treated with azinphos-methyl at 5 lb. The timing at the effective sprays would not interfere with a program of codling moth control by the sterility method
Masonaphis maxima (Mason) (Homoptera: Aphididae), an aphid on thimbleberry with an unusual life history
No full textA two-year study of <i>Masonaphis maxima</i> (Mason) on thimbleberry, <i>Rubus parviflorus</i> Nutt. revealed an unusual life history. The eggs hatched in late March or early April, and the fundatrices matured and reproduced a month later. Males and females were produced in late May or in June and egg-laying had started by July. This early egg-laying coincided with the cessation of production of new growth by the host plant. Additional description of the fundatrix is included
Brachycoryna hardyi Crotch and Microrhopala cyanea (Say), two hispanae rare in British Columbia (Coleoptera: Chrysomelidae)
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Parasites of the larch casebearer, Coleophora laricella (Hbn.) in British Columbia (Lepidoptera: Coleophoridae)
No full textThe following nine species of parasites and hyperparasites were recovered from rearings of the larch casebearer, <i>Coleophora laricella</i> (Hbn.), in interior British Columbia, 1966-1968: <i>Bracon</i> sp., <i>Scambus decorus</i> Wly., <i>Scambus transgressus</i> (Holmg.), <i>Gelis tenellus</i> (Say), <i>Dicladocerus westwoodii<i/> (Westw.), <i>Tetrastichus xanthops</i> (Ratz.), <i>Amblymerus</i> prob. new sp., <i>Sceptrothelys deione</i> (Wlk.) and <i>Spilochalcis albifrons</i> Walsh
Drift periodicity and upstream dispersion of stream insects
No full textDrift periodicity and upstream dispersion by larval and nymphal insects from two north Idaho streams were investigated. Drift was determined with drift nets sampling at 2-hour intervals over 24-hour periods. Upstream dispersion was evaluated using a marking-release-recapture technique. Mayflies demonstrated nocturnal drift as did the corixid <i>Sigara (Vermicorixa) grossolineata</i> Hungerford and dipteran <i>Simulium</i> sp.; chironomids showed con tinuous drift as opposed to behavioural drift for most of the other insects studied. Both nocturnal and diurnal drift occurred with species in the order Trichoptera. Stonefies showed little tendency to drift. Mid-summer upstream dispersion by mature nymphs and larvae of selected species was found to be insignificant as a means of recolonizing insect-decimated riffle habitats and offsetting downstream displacement by drift
Flight-muscle degeneration in spruce beetles, Dendroctonus Rufipennis (Coleoptera: Scolytidae)
No full textChanges in width of an indirect flight muscle, the lateralis medius, were measured at various stages of adult life of <i>D. rufipennis</i>. This muscle degenerated in both female and male spruce beetles after flight and attack on the host. Flight muscles of young adults that emerged in late summer to enter hibernation were smaller than those of beetles taken in spring flight. Young beetles entering hibernation did not disperse by flying, but dropped or crawled to the bases of trees, in which they had developed, and burrowed into the bark
Corixidae (Hemiptera) as predators: Rearing on frozen brine shrimp
No full textMany Corixidae are predaceous. In the laboratory they can be reared on frozen brine shrimp. Feeding seems not to occur when temperatures are as low as 5C