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Darrell W. Ross
Oregon State University
45Publications
14H-index
507Citations
Publications 45
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Last.A. Steven MunsonH-Index: 12
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Leucopis argenticollis (Zetterstedt) and Leucopis piniperda (Malloch) are known to feed on the lineage of Adelges tsugae Annand that is native to western North America, but it is not known if they will survive on the lineage that was introduced from Japan to the eastern USA. In 2014, western Leucopis spp. larvae were brought to the laboratory and placed on A. tsugae collected in either Washington (North American A. tsugae lineage) or Connecticut (Japanese lineage). There were no significant diff...
4 CitationsSource
#1Darrell W. Ross (OSU: Oregon State University)H-Index: 14
#2Glenn R. Kohler (DOS: United States Department of State)H-Index: 2
Last.Kimberly F. Wallin (UVM: University of Vermont)H-Index: 12
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As part of a comprehensive study to survey predators associated with hemlock woolly adelgid, Adelges tsugae Annand, 1928 in the Pacific Northwest (PNW), U.S.A. (Kohler et al. 2008), predators of balsam woolly adelgid, Adelges piceae (Ratzeburg, 1844) and Cooley spruce gall adelgid, Adelges cooleyi (Gillette, 1907) (all Hemiptera: Adelgidae) were sampled on nine dates from June 2005 to October 2006 on a small number of trees. Samples were collected every 6–8 weeks. Predators were collected from t...
2 CitationsSource
#1Harrison M. Brookes (OSU: Oregon State University)H-Index: 1
#2Darrell W. Ross (OSU: Oregon State University)H-Index: 14
Last.Laura L. Lowrey (USFS: United States Forest Service)H-Index: 1
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Current recommendations for applying the antiaggregation pheromone 3-methylcyclohex-2-en-1-one (MCH) to protect live trees from Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, infestation are to space individual passive releasers (MCH bubble capsules) on a 12- by 12-m grid throughout areas to be protected. Previous field studies and a theoretical study using a puff dispersion model to predict pheromone concentrations have shown that releasers emitting higher rates of MCH spaced farther ap...
2 CitationsSource
Adelges tsugae infested western hemlock trees were sampled periodically for 1 year at two locations in Oregon and Washington to compare the phenology and abundance of three associated predators (Leucopis argenticollis, Leucopis piniperda, and Laricobius nigrinus) and their host. On each sample date, two 3-10 cm long terminal twigs were collected from each tree and brought to the laboratory to count all life stages of A. tsugae and the three predators. Peak larval abundance of Leucopis spp. and L...
10 CitationsSource
#1Tara M. Strand (PNNL: Pacific Northwest National Laboratory)H-Index: 1
#2Darrell W. Ross (OSU: Oregon State University)H-Index: 14
Last.Brian K. Lamb (WSU: Washington State University)H-Index: 52
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ABSTRACT An instantaneous puff dispersion model was used to assess concentration fields of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (MCH), within a 1-ha circular plot. Several combinations of MCH release rate and releaser spacing were modeled to theoretically analyze optimal deployment strategies. The combinations of MCH release rate and releaser spacing used in the modeling exercise were based on results of previous field ...
3 CitationsSource
#1Sarah M. Grubin (OSU: Oregon State University)H-Index: 1
#2Darrell W. Ross (OSU: Oregon State University)H-Index: 14
Last.Kimberly F. Wallin (UVM: University of Vermont)H-Index: 12
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Leucopis spp. (Diptera: Chamaemyiidae) from the Pacific Northwest previously were identified as potential biological control agents for the hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), in the eastern United States. We collected Leucopis spp. larvae from A. tsugae infested western hemlocks in Oregon and Washington and reared them on an unidentified Pineus spp., Pineus strobi (Hartig), Adelges cooleyi (Gillette), Adelges piceae (Ratzeburg), and A. tsugae in three no-choice...
14 CitationsSource
#1Kimberly F. Wallin (USFS: United States Forest Service)H-Index: 12
#2Tanya Latty (USYD: University of Sydney)H-Index: 18
Last.Darrell W. Ross (OSU: Oregon State University)H-Index: 14
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We studied the adult ambulatory response of the predator, Laricobius nigrinus Fender (Coleoptera: Derodontidae), to odors from its prey, Adelges tsugae Annand, the hemlock woolly adelgid, and foliage of hemlock woolly adelgid, host hemlocks (Tsuga spp.), and other conifers. Both the predator and hemlock woolly adelgid are apparently native to western North America, but the predator is being released in the eastern United States, which has different hemlock species, for biological control of a li...
9 CitationsSource
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