Biology:Dendroctonus pseudotsugae
| Dendroctonus pseudotsugae | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Coleoptera |
| Infraorder: | Cucujiformia |
| Family: | Curculionidae |
| Genus: | Dendroctonus |
| Species: | D. pseudotsugae
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| Binomial name | |
| Dendroctonus pseudotsugae Hopkins, 1905
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Dendroctonus pseudotsugae, the Douglas-fir beetle, is a species of bark beetle found in western North America. Three subspecies exist that correspond to the subspecies of Douglas-fir. The beetles also infest downed Larch trees.[1] Outbreaks often occur in conjunction with drought, root rot diseases, overcrowding, damage by insects that damage foliage, and environmental disturbance. This insect is part of the western forest ecosystem, playing a role in thinning weak trees in a stand.[2]
Adult Douglas-fir beetles are light brown when young and become dark brown or black with reddish wing covers. They are somewhat hairy and range in size from 4.4 to 7 mm. The larvae are small, legless, the size of grains of rice, and white. Pupae are white to cream colored. Visible evidence of infestation includes patches of orange to reddish-brown boring dust in the bark or at the base of the tree. Resin streamers from attacks higher in the tree may also be present. Inside the bark, 6 to 30 inch egg galleries run parallel with the grain. Eggs are laid on either side of the gallery and when they hatch, the larvae mine perpendicular to the galleries.[1][2]
References
- ↑ 1.0 1.1 Furniss, Malcolm; Kegley, Sandra. "Forest Insect & Disease Leaflet 5". USDA Forest Service, Pacific Northwest Region (R6), Portland, Oregon. http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_043201.pdf.
- ↑ 2.0 2.1 Dekker-Robertson, Donna; Griessmann, Peter; Baumgartner, Dave; Hanley, Don. Douglas-fir Beetle (Dendroctonus pseudotsugae). Washington State University and US Department of Agriculture. pp. 11–12.
External links
- http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5187396.pdf
- http://www.barkbeetles.org/douglasfir/dfb.html
Wikidata ☰ Q24956093 entry
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