A portable, power-driven sifter for soil insect studies

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A note on the acceptability of leaf macerates on filter paper of plants from peat bogs by adult black vine weevils, Brachyrhinus sulcatus (F.)

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Fecundity of the black vine weevil, Brachyrhinus sulcatus (F.), fed on foliage of blueberry, cranberry and weeds from peat bogs

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The effect of root weevils (Coleoptera: Curculionidae) on yield of five strawberry cultivars in British Columbia

To determine the effect of root weevils on strawberry yield, 5 strawberry cultivars: Totem, Shuksan, Northwest, Cheam and BC-25 were infested in the field with 2 or 8 adults per plant of 1 of 4 species of root weevils: the black vine weevil, Otiorhynchus sulcatus (F.); the strawberry root weevil, O. ovatus L.; the obscure strawberry root weevil, Sciopithes obscurus Horn; and the woods weevil Nemocestes incomptus (Horn). There were no significant differences in yield between weevil infestations in the first cropping season. In the second year plants in the plot infested with 8 O. sulcatus per plant produced significantly less fruit than those in all other infestations. Within this plot Totem and Cheam produced significantly more fruit than the other cultivars. In the third year most of the other weevil-infested plots produced significantly less fruit than the uninfested plot. The plot with 2 N. incomptus per plant was the most severely damaged in the third season. The cultivars Totem and Cheam were usually the most tolerant to all weevils. Northwest and BC-25 were the most susceptible to all weevils. The tolerance of Totem to attack by the main root weevil species, O. sulcatus, is probably related to the ability of the plant to produce and regenerate a large supply of roots

Fecundity of the black vine weevil, Otiorhynchus sulcatus (Coleoptera: Curculionidae), fed foliage from some current cultivars and advanced selections of strawberry in British Columbia

Adults of the black vine weevil, Otiorhynchus sulcatus (F.), kept individually in plastic vials in the laboratory were fed foliage picked from strawberry cultivars or selections in one field of the British Columbia strawberry breeding program at Abbotsford. The source of foliage had no significant influence of preoviposition period, weight gain, or amount of foliage consumed. However, there were significant differences in the number of eggs laid during a ten-week period and in the number of larvae that hatched. The fewest eggs were laid and larvae hatched when weevils fed on the new cultivar Tyee and the selection BC 73-9-79. The other foliage sources in order of increasing numbers of eggs were BC 70-22-82, Totem, BC 69-5-34, Shuksan, and BC 70-20R-15

A note on the acceptability of leaf macerates on filter paper of plants from peat bogs by adult black vine weevils, Brachyrhinus sulcatus (F.)

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Acceptability of cultivars of highbush Blueberry at varying temperatures by adult black vine weevils (Col.: Curculionidae)

Adults of the black vine weevil,Otiorhynchus (Brachyrhinus) sulcatus  (F.), fed and oviposited at normal, expected rates when fed excised foliage of the acceptable highbush blueberry cultivars, June and Stanley, in variable temperature regimes of 7 to 15, mean 10; 12 to 19, mean 15; and 16 to 29, mean 22C. However, on the unacceptable cultivars, Cabot and Weymouth, they laid some eggs at the high and very few eggs at the medium regimes, whereas in earlier work they laid no eggs at a constant 20C. These results indicate that Cabot and Weymouth provide barely adequate nutrition to the weevils and that environmental stresses such as a constant 20C demand more nutrients than the unacceptable cultivars can provide. Variable conditions, probably due to a lower turn-over rate during the cool periods, allow the insect to obtain the nutrients necessary for fat body development and some oviposition

A portable, power-driven sifter for soil insect studies

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Fecundity of the black vine weevil, Brachyrhinus sulcatus (F.), fed on foliage of blueberry, cranberry and weeds from peat bogs

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High Velocity Cloud Complex H: A Satellite of the Milky Way in a Retrograde Orbit?

Observations with the Green Bank Telescope of 21cm HI emission from the high-velocity cloud Complex H suggest that it is interacting with the Milky Way. A model in which the cloud is a satellite of the Galaxy in an inclined, retrograde circular orbit reproduces both the cloud's average velocity and its velocity gradient with latitude. The model places Complex H at approximately 33 kpc from the Galactic Center on a retrograde orbit inclined about 45 degrees to the Galactic plane. At this location it has an HI mass > 6 10^6 Msun and dimensions of at least 10 by 5 kpc. Some of the diffuse HI associated with the cloud has apparently been decelerated by interaction with Galactic gas. Complex H has similarities to the dwarf irregular galaxy Leo A and to some compact high-velocity clouds, and has an internal structure nearly identical to parts of the Magellanic Stream, with a pressure P/k about 100 cm^{-3} K.Comment: 12 pages includes 4 figures. To be published in Astrophysical Journal Letters, 1 July 200