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CONTACT INFORMATION
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Research Weed Ecologist
Phone: 406.433.9471
Fax: 406.433.5038
E-mail: alenssen[at]sidney.ars.usda.gov |
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EDUCATION |
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B.S. Agronomy |
1980 |
Cornell University, Ithaca, New York |
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M.S. Agronomy |
1987 |
Kansas State University, Manhattan,
Kansas |
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Ph. D. Agronomy |
1989 |
Kansas State University, Manhattan,
Kansas |
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CURRENT RESEARCH |
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Andy’s research program
directly addresses three areas, 1) developing diverse irrigated and
dryland cropping strategies and technologies for improved weed
management, 2) quantify environmental benefits from improved weed
management, particularly for management of herbicide resistant weeds,
and 3) extend research results and increase adoption rates of
sustainable weed management and crop production practices in irrigated
and dryland environments. Specifically, his field studies involve
determining the influence of diversifying and intensifying the
durum-fallow dryland system with annual forage, pulse and/or oilseed
crops on weed species diversity, weed biomass, soil seed bank, water and
nitrogen use, and crop yield and quality. Other field studies examine
cultural methods, such as seeding rate, row spacing, fertilization
practices, or rolling to reduce herbicide use without compromising weed
control, crop yield or quality. Irrigated field studies include
determining weed seed numbers in irrigation waters, and the influence of
crop rotation and previous crop on kochia and other weeds in sugar beet
production. Laboratory investigations include determining the influence
of phytochemistry on weed seed destruction by arthropods and soil
microbes. |
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RESEARCH EXPERIENCE |
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Over the past 10 years, Andy has led collaborative, multidisciplinary team projects investigating
intensified, diversified dryland crop rotations and their influences on
wheat and alternate crop productivity and quality, weeds, insects and
diseases, and potential environmental and economic benefits. He has
utilized global positioning systems with geographic information systems
on field-scale research plots to compare soil water and nitrate, crop
yield and quality, and weeds, insects, and diseases, in conventional and
diversified dryland wheat rotations in Montana. He has been Project
Director and Principal Investigator of the Sustainable Pest Management
in Dryland Wheat project, with research sites near Froid (21 acres),
Havre (50 acres), and Moore (35 acres), Montana. Results from these
projects have documented that some diversified crop rotations,
particularly those utilizing zero tillage, can improve grain yield and
quality, decrease plant diseases such as Fusarium Crown Rot, decrease
herbicide use and weed interference, and use fertilizer nitrogen and
precipitation more efficiently than conventional wheat-fallow systems.
He has extensive experience developing and integrating cultural controls
of pests into production systems, including alfalfa. He also has
extensive research experience in irrigated grain and irrigated and
dryland forage management and utilization. Technology transfer has been
through scientific press, web documents, national and regional
professional meetings, and numerous field visits and Cooperative
Extension meetings. He has made numerous invited presentations to
university departments, Extension meetings, action agencies, and grower
groups. |
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RELATED WEBPAGES |
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Sustainable pest
management in dryland wheat project
Pacific Northwest Canola Funded Research
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SELECTED PUBLICATIONS |
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Lenssen, A.W., E.L Sorensen, G.L. Posler, and
L.H. Harbers. 1988. Forage quality of perennial glandular-haired and
eglandular Medicago populations. Crop Sci. 28:168-171.
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Lenssen, A.W., E.L. Sorensen, G.L. Posler,
and L.H. Harbers. 1989. Sheep preference of perennial erect
glandular-haired and eglandular Medicago populations under free-choice
conditions. Crop Sci. 29:65-68.
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Lenssen, A.W., E.L. Sorensen, and G.L. Posler.
1990. Forage quality of genetically diverse alfalfa germplasms at four
phenological growth stages. Euphytica 51:53-57.
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Lenssen, A.W., E.L Sorensen, G.L. Posler, and
L.H. Harbers. 1991. Basic alfalfa germplasms differ in nutritive value
of forage. Crop Sci. 31:293-296.
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Lenssen, A.W., E.L. Sorensen, G.L. Posler,
and D.L. Stuteville. 1991. Resistance to anthracnose protects forage
quality of alfalfa. Crop Sci. 31:147-150.
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Posler, G.L., A.W. Lenssen, and G.L. Fine.
1993. Forage yield, quality, persistence, and compatibility of
grass-legume mixtures. Agron. J. 85:554-560.
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Martin, S.S., C.E. Townsend, and A.W. Lenssen.
1994. Induced isoflavonoids in diverse populations of Astragalus cicer.
Biochem. Syst. Ecol. 22:657-661.
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Lenssen, A.W., S.S. Martin, and C.E.
Townsend. 1995. Clonal-by-environment interactions influence
isoflavonoid accumulation in Astragalus cicer. Crop Sci. 35:756-753.
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Cash, S.D., Zamora, D.L. and A.W. Lenssen.
1998. Viability of weed seeds in feed pellet processing. J. Range
Manage. 51:181-185.
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Blodgett, S.L., A.W. Lenssen and S.D. Cash.
2000. Swathing with early raking for control of alfalfa weevil (Coleoptera:
Curculionidae). J. Entomol. Sci. 35:129-135.
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Lenssen, A.W., J.D. Banfield, and S.D. Cash.
2001. Trichome density influences drying rate of alfalfa forage. Grass
and Forage Sci. 56:1-9.
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SELECTED PROCEEDINGS |
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Lenssen, A.W., S.L. Blodgett, S.D. Cash, and
P.M. Denke. 1998. Early raking reduces alfalfa weevil populations. in:
Proceedings of the Montana Hay Growers Association, Billings, MT. p.
38-41.
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Lenssen, A.W., J.D.
Banfield, S.D. Cash. 1998. Trichomes influence drying rate of alfalfa
forage. in: Report of the 36th North American Alfalfa Improvement
Conf., Bozeman, MT.
Blodgett, S.L., A.W. Lenssen, S.D. Cash. 1998. An adaptation to early
harvest for improved management of alfalfa weevil (Coleoptera:
Curculionidae). in: Report of the 36th North American Alfalfa
Improvement Conf., Bozeman, MT.
Lenssen, A.W., S.L. Blodgett, S.D. Cash, R.A. Ditterline. 1998.
Variation for erect glandular hair density in perennial and annual
Medicago. in: Report of the 36th North American Alfalfa Improvement
Conf., Bozeman, MT.
Long, D.S., C. Meier, R.E. Engel, and A.
Lenssen. 2002. Landscape elements as a basis for nitrogen management
zones in Montana. p. 46 52. Proceedings of the Great Plains Soil
Fertility Conference, 5-6 Mar. 2002, Denver, CO.
Spezzano, T.M., H.B. Goosey, P.G. Hatfield,
S.L. Blodgett, S.D. Cash, P.M. Denke, R.W. Kott, A.W. Lenssen, C.B.
Marlow. 2003. Managing insect pest damage to
wheat and alfalfa by integrating sheep into crop production. pp. 1-6,
Proceedings of the Montana Nutrition Conference, Bozeman, MT.
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CONTACT INFORMATION |
Biological Science Technician
Phone: 406.433.9419
Fax: 406.433.5038
E-mail: mgaffri[at]sidney.ars.usda.gov |
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EDUCATION |
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B.S. |
Agronomy |
1982 |
Montana State
University |
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B.S. |
Plant Protection |
1982 |
Montana State
University |
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EXPERIENCE |
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1974-1976 |
Managed a small grain,
row crop, and beef farm Wyoming |
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1976-1982 |
Student lab assistant
(MSU) on Certified Seed, Revegitation of strip mines, and Leafcutter
Bee programs. |
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1982-1983 |
Set up seed farm as a
consultant and managed a Leafcutter Bee pollination business in
Montana. |
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1983-1985 |
Managed an 8,000 acre
irrigated forage farm in Iraq |
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1985-1986 |
Custom farmed in
Montana and Wyoming |
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1986-1988 |
Laboratory Technician:
Dryland cropping weeds project USDA-ARS in Montana |
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1989-1999 |
Laboratory Technician:
Leafy Spurge Biocontrol project USDA-ARS in Montana and North Dakota |
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1999-2001 |
Laboratory Technician:
White Top Biocontrol and Mapping project USDA-ARS in 16 western
states |
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2001-2002 |
Laboratory Technician:
Irrigation Cropping systems project USDA-ARS in Montana and North
Dakota |
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CONTACT INFORMATION |
Biological Science Technician
Phone: 406.433.9404
Fax: 406.433.5038
E-mail: jharvey[at]sidney.ars.usda.gov |
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USDA-ARS-NPARL
P.O. Box 463 Sidney, MT 59270 PH: 406.433.2020 FAX: 406.433.5038
For accessibility
questions or other concerns, please e-mail: webmaster[at]sidney.ars.usda.gov
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