11 results on '"AERONAUTICS in forestry"'
Search Results
2. Aerially applied verbenone-releasing laminated flakes protect Pinus contorta stands from attack by Dendroctonus ponderosae in California and Idaho.
- Author
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Gillette, N.E., Erbilgin, N., Webster, J.N., Pederson, L., Mori, S.R., Stein, J.D., Owen, D.R., Bischel, K.M., and Wood, D.L.
- Subjects
INSECT-plant relationships ,LODGEPOLE pine ,MOUNTAIN pine beetle ,HORMONE antagonists ,TERPENES ,AERONAUTICS in forestry - Abstract
Abstract: We tested a new formulation of verbenone, an antiaggregation pheromone of the mountain pine beetle (Dendroctonus ponderosae Hopkins) (Coleoptera: Curculionidae: Scolytinae), for area-wide protection of lodgepole pine (Pinus contorta Douglas ex Loudon) stands in the western United States. Helicopter applications of verbenone-releasing laminated flakes were made at the rate of 370g of active ingredient/ha to two sites, one in California and one in Idaho, during summer 2005. Each site consisted of five 20.23-ha treated plots and five matching 20.23-ha untreated plots. We assessed D. ponderosae flight into study plots using traps baited with aggregation pheromones and we tallied D. ponderosae attack rates on P. contorta trees in treated and control plots before and after application. There were no significant differences between numbers of D. ponderosae trapped on treated and control plots. However, a significantly smaller proportion of P. contorta trees was attacked in treated plots than in control plots at both sites; the attack rate in untreated stands was roughly three times that of treated stands in both California and Idaho, even at this low application rate. Furthermore, attack rate in 2004 was a significant explanatory variable for the response in 2005 regardless of treatment in both California and Idaho. There was no significant treatment effect at either site on attraction of Temnochila chlorodia (Coleoptera: Trogositidae) Mannerheim, a key predator of D. ponderosae, to the prey aggregation pheromone. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
3. Pheromone-based disruption of Eucosma sonomana and Rhyacionia zozana (Lepidoptera: Tortricidae) using aerially applied microencapsulated pheromone.
- Author
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Gillette, Nancy E., Stein, John D., Owen, Donald R., Webster, Jeffrey N., and Mori, Sylvia R.
- Subjects
- *
PHEROMONES , *BORERS (Insects) , *LEPIDOPTERA , *AERIAL spraying & dusting in forestry , *AERONAUTICS in forestry - Abstract
Two aerial applications of microencapsulated pheromone were conducted on five 20.2 ha plots to disrupt western pine shoot borer (Eucosma sonomana Kearfott) and ponderosa pine tip moth (Rhyacionia zozana (Kearfott); Lepidoptera: Tortricidae) orientation to pheromones and oviposition in ponderosa pine plantations in 2002 and 2004. The first application was made at 29.6 g active ingredient (AI)/ha, and the second at 59.3 g AI/ha. Baited sentinel traps were used to assess disruption of orientation by both moth species toward pheromones, and E. sonomana infestation levels were tallied from 2001 to 2004. Treatments disrupted orientation by both species for several weeks, with the first lasting 35 days and the second for 75 days. Both applications reduced infestation by E. sonomana, but the lower application rate provided greater absolute reduction, perhaps because prior infestation levels were higher in 2002 than in 2004. Infestations in treated plots were reduced by two-thirds in both years, suggesting that while increasing the application rate may prolong disruption, it may not provide greater proportional efficacy in terms of tree protection. The incidence of infestations even in plots with complete disruption suggests that treatments missed some early emerging females or that mated females immigrated into treated plots; thus operational testing should be timed earlier in the season and should comprise much larger plots. In both years, moths emerged earlier than reported previously, indicating that disruption programs should account for warmer climates in timing of applications. The AIs we tested are behaviorally active for 13 other species of Rhyacionia and six other species of Eucosma, so the approach may have wide application. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
4. Vancouver Island.
- Author
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Vallee, Michel, Parsons, Candace, and Banwell, Tristan
- Subjects
FORESTS & forestry ,AIRTANKERS (Forest fire control) ,AERONAUTICS in forest fire control ,AERONAUTICS in forestry ,FOREST fire prevention & control ,SAWMILLS - Abstract
This article offers news related to the Vancouver Island Section of the Canadian Institute of Forestry/Institut forestier du Canada (CIF/IFC). Among the topics discussed are the excursion to Port Alberni, British Columbia to tour the flying tankers located there. The author reports that the aircraft are used by the Coulson Group as water bombers that help combat forest fires in the British Columbia and Pacific Northwest areas. The tour was conducted by a former crewman and the group was allowed to explore the planes at will. The group also visited the McLean Mill, the only operating steam mill in Canada, on the same trip. It is reported that the Section also held its annual Beer and Chili Cook-off in November 2007.
- Published
- 2008
5. Aerial woodwork: This could be why they call it a chopper.
- Author
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Powell, Dennis E.
- Subjects
TREE pruning ,HELICOPTERS -- Piloting ,AERONAUTICS in forestry ,HELICOPTERS -- Control ,ROADS - Abstract
The author describes his experience of watching a helicopter perform tree trimming work on Ohio Route 329. He watched the helicopter, which was provided by Aerial Solutions, Inc., use an air saw to trim the branches of trees that had grown near the powerlines, leading him to admire the pilot's precision flying and maneuvering while wondering if this work would also soon be automated.
- Published
- 2018
6. From the Editor.
- Subjects
HISTORY of aeronautics ,AERONAUTICS in forestry - Abstract
An introduction is presented which discusses various reports within the issue on topics including forestry aviation, historical archaeology, and aviator John Joseph Gilmore.
- Published
- 2013
7. Bombs away!
- Author
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Raloff, Janet
- Subjects
- *
AERONAUTICS in forestry , *REFORESTATION - Abstract
Looks at Moshe Alamaro's reforestation proposal for hard-to-reach areas of the Earth. His hopes for aerial reforestation; Deployment of tree seedlings from the air; Targeting of denuded slopes, barren deserts, and war-ravaged sites; Dangers posed to the soils without reforestation; Using military technologies to protect the Earth's environment; Whom Alamaro has consulted for help.
- Published
- 1997
- Full Text
- View/download PDF
8. Evaluation of photographic properties for area estimation
- Abstract
From the known image positional errors on aerial photographs, this thesis computes and evaluates acreage estimation errors. Four hypothetical tracts were used in simulating aerial photographs with 104 different camera orientation combinations. Flying heights of 4000 and 6000 feet, focal lengths of 24 and 50 millimeters with and without lens distortion, and tilts of 0, 3, 6, and 12 degrees were simulated. The 416 photographs were all simulated with the camera exposure station centered above the midpoint of the respective tract's bounding rectangle. The topographic relief of the tracts ranged from 19 feet in the Coastal Plain to 105 feet in the Piedmont. It was found that lens focal length did not have an independent effect on the acreage estimates. Relief error, the lowest, averaged -0.080%. In comparison, small errors in calculating scale were shown to be larger than relief errors. Tilt was recommended to be limited to six degrees, averaging +1.6% error at six degrees tilt. Because of its positive exponential nature when the tracts are centered, tilt can induce large biases. including tilts from zero to six degrees,the average was 0.634%. Lens distortion error averaged -0.686%. Overall, the average acreage error was 0.363% for simulations up to and including six degrees of tilt with and without lens distortion. This result is for centered tracts, and it was felt many of the errors were compensating given this situation. In conclusion, the photographic images can estimate areas to $1%, however, additional errors are imparted during actual measurement of the photographs.
- Published
- 1988
9. Evaluation of photographic properties for area estimation
- Abstract
From the known image positional errors on aerial photographs, this thesis computes and evaluates acreage estimation errors. Four hypothetical tracts were used in simulating aerial photographs with 104 different camera orientation combinations. Flying heights of 4000 and 6000 feet, focal lengths of 24 and 50 millimeters with and without lens distortion, and tilts of 0, 3, 6, and 12 degrees were simulated. The 416 photographs were all simulated with the camera exposure station centered above the midpoint of the respective tract's bounding rectangle. The topographic relief of the tracts ranged from 19 feet in the Coastal Plain to 105 feet in the Piedmont. It was found that lens focal length did not have an independent effect on the acreage estimates. Relief error, the lowest, averaged -0.080%. In comparison, small errors in calculating scale were shown to be larger than relief errors. Tilt was recommended to be limited to six degrees, averaging +1.6% error at six degrees tilt. Because of its positive exponential nature when the tracts are centered, tilt can induce large biases. including tilts from zero to six degrees,the average was 0.634%. Lens distortion error averaged -0.686%. Overall, the average acreage error was 0.363% for simulations up to and including six degrees of tilt with and without lens distortion. This result is for centered tracts, and it was felt many of the errors were compensating given this situation. In conclusion, the photographic images can estimate areas to $1%, however, additional errors are imparted during actual measurement of the photographs.
- Published
- 1988
10. Evaluation of photographic properties for area estimation
- Author
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Wiles, Steven Jay, Forestry, Smith, James L., Johnson, Steven D., and Scrivani, John A.
- Subjects
Aerial photography in forestry ,Aeronautics in forestry ,LD5655.V855 1988.W545 - Abstract
From the known image positional errors on aerial photographs, this thesis computes and evaluates acreage estimation errors. Four hypothetical tracts were used in simulating aerial photographs with 104 different camera orientation combinations. Flying heights of 4000 and 6000 feet, focal lengths of 24 and 50 millimeters with and without lens distortion, and tilts of 0, 3, 6, and 12 degrees were simulated. The 416 photographs were all simulated with the camera exposure station centered above the midpoint of the respective tract's bounding rectangle. The topographic relief of the tracts ranged from 19 feet in the Coastal Plain to 105 feet in the Piedmont. It was found that lens focal length did not have an independent effect on the acreage estimates. Relief error, the lowest, averaged -0.080%. In comparison, small errors in calculating scale were shown to be larger than relief errors. Tilt was recommended to be limited to six degrees, averaging +1.6% error at six degrees tilt. Because of its positive exponential nature when the tracts are centered, tilt can induce large biases. including tilts from zero to six degrees,the average was 0.634%. Lens distortion error averaged -0.686%. Overall, the average acreage error was 0.363% for simulations up to and including six degrees of tilt with and without lens distortion. This result is for centered tracts, and it was felt many of the errors were compensating given this situation. In conclusion, the photographic images can estimate areas to $1%, however, additional errors are imparted during actual measurement of the photographs. Master of Science
- Published
- 1988
11. Federal agencies cancel large airtanker contract.
- Subjects
CONTRACTS ,AIRTANKERS (Forest fire control) ,AIRPLANES ,AERONAUTICS in forest fire control ,AERONAUTICS in forestry - Abstract
Announces that the U.S.D.A. Forest Service and the Department of the Interior are terminating the contract for 33 large airtankers due to concerns over safety. Basis for the decision to terminate the contract; Request made by Arizona Governor Janet Napolitano that the fleet be immediately restored or replaced.
- Published
- 2004
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