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• 1. [Article] Controlling pocket gopher damage to agricultural crops

  Published February 1983. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/cata...

  Citation × Citation Citation Abstract Copy Title: Controlling pocket gopher damage to agricultural crops Author: DeCalesta, David S., Oregon State University. Extension Service Published February 1983. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Controlling pocket gopher damage to agricultural crops Author: DeCalesta, David S., Oregon State University. Extension Service Published February 1983. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 2. [Article] Controlling pocket gopher damage to agricultural crops

  Published October 1990. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catal...

  Citation × Citation Citation Abstract Copy Title: Controlling pocket gopher damage to agricultural crops Author: Edge, W. Daniel, Oregon State University. Extension Service Published October 1990. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Controlling pocket gopher damage to agricultural crops Author: Edge, W. Daniel, Oregon State University. Extension Service Published October 1990. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 3. [Article] Use of reactor cooling water from nuclear power plants for irrigation of agricultural crops; project completion report

  Citation × Citation Citation Abstract Copy Title: Use of reactor cooling water from nuclear power plants for irrigation of agricultural crops; project completion report Author: Rykbost, K. A., United States. Office of Water Resources Research, Boersma, L., Barlow, Edward William Ross Title: Use of reactor cooling water from nuclear power plants for irrigation of agricultural crops; project completion report Author: Rykbost, K. A., United States. Office of Water Resources Research, Boersma, L., Barlow, Edward William Ross Close

• 4. [Article] Controlling pocket gopher damage to agricultural crops

  Declared out of print December 2009. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonst...

  Citation × Citation Citation Abstract Copy Title: Controlling pocket gopher damage to agricultural crops Author: Edge, W. Daniel, Oregon State University. Extension Service, Loegering, John P., 1964- Declared out of print December 2009. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Controlling pocket gopher damage to agricultural crops Author: Edge, W. Daniel, Oregon State University. Extension Service, Loegering, John P., 1964- Declared out of print December 2009. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 5. [Article] Snap beans and other commercial truck crops - agricultural statistics 1934 to 1943 - Oregon by counties preliminary release

  Published February 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/cata...

  Citation × Citation Citation Abstract Copy Title: Snap beans and other commercial truck crops - agricultural statistics 1934 to 1943 - Oregon by counties preliminary release Author: Oregon State College. Federal Cooperative Extension Service Published February 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Snap beans and other commercial truck crops - agricultural statistics 1934 to 1943 - Oregon by counties preliminary release Author: Oregon State College. Federal Cooperative Extension Service Published February 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 6. [Article] Effects of the northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) on Mitcham peppermint (Mentha piperita L.) and Scotch spearmint (Mentha cardiaca Baker)

  The northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) is a widespread pest on many plants in temperate zones such as the Pacific Northwest (U. S. A. ) Peppermint and spearmint are two major ...

  Citation × Citation Citation Abstract Copy Title: Effects of the northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) on Mitcham peppermint (Mentha piperita L.) and Scotch spearmint (Mentha cardiaca Baker) Author: Eshtiaghi, Hassan The northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) is a widespread pest on many plants in temperate zones such as the Pacific Northwest (U. S. A. ) Peppermint and spearmint are two major agricultural crops in Oregon and Washington with a combined annual acreage of 50, 000 to 55, 000 and an oil value of about 25 million dollars. Both plants are attacked by a number of natural enemies including some species of plant parasitic nematodes with M. hapla considered to be most destructive. A pathogenicity study which included fifteen different isolates of M. hapla, revealed that peppermint was a more susceptible host plant than spearmint. These nematode populations were collected from four major mint growing areas of the United States (Idaho, Indiana, Oregon and Washington) with most populations obtained from Oregon and Washington. Usually no symptoms appear on the above ground parts of root-knot nematode infected plants. Therefore, it is possible that farmers in these areas may overlook infected mint planting stock and introduce the pest into new lands. Spread of the nematode could cause serious problems in mint and many other agricultural crops. Inoculation of peppermint cuttings and rhizomes with different densities of nematode egg masses caused varying degrees of root gall formation in three and four month growing periods. Regression slopes indicated that the relationships between inoculum densities and root gall formation was significant at the one percent level. However, inoculated rhizomes and the longer growing period caused more infection in plants. A gradual decline in plant vigor and productivity could be attributed to root-knot nematode infection which resulted in a significant shoot length reduction and reduced plant weights. Dry matter contents and concentrations of N, P, Mn, Fe and Al decreased, but there was a slight increase in Ca. Spearmint rhizomes inoculated with fresh second stage larvae of M. hapla produced equally severe galling in four months of growth regardless of the various initial inoculum densities. However, no significant relationships between inoculum densities and reduction in plant weights or shoot lengths developed in this host. Decreases in dry matter contents of spearmint plants as well as concentrations of chemical elements were similar to those of peppermint. A deterrent interaction between the fungus Verticillium dahliae Kleb. and M. hapla was observed when peppermint and spearmint plants were inoculated with the two pathogens. Significantly (at the one percent level) less root galls were formed when V. dahliae was combined with different densities of M. hapla larvae. Also interaction between fungus and nematode caused longer incubation periods and less severe Verticillium wilt disease symptoms. Weight reductions due to such interaction were insignificant and the data indicate that peppermint was more susceptible to the pathogens than spearmint. It can be concluded that M. hapla can infect both peppermint and spearmint without showing obvious disease symptoms on aerial parts of plants. Therefore, infections can remain unnoticed particularly in spearmint which has more tolerance to the nematode Introduction of root-knot nematode infected planting stock to new planting sites or other fields spreads the parasite which will affect other agricultural crops. Also suppression of Verticillium wilt disease symptoms by the nematodes could complicate or delay early diagnosis and control of wilt disease. Title: Effects of the northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) on Mitcham peppermint (Mentha piperita L.) and Scotch spearmint (Mentha cardiaca Baker) Author: Eshtiaghi, Hassan The northern root-knot nematode (Meloidogyne hapla Chitwood, 1949) is a widespread pest on many plants in temperate zones such as the Pacific Northwest (U. S. A. ) Peppermint and spearmint are two major agricultural crops in Oregon and Washington with a combined annual acreage of 50, 000 to 55, 000 and an oil value of about 25 million dollars. Both plants are attacked by a number of natural enemies including some species of plant parasitic nematodes with M. hapla considered to be most destructive. A pathogenicity study which included fifteen different isolates of M. hapla, revealed that peppermint was a more susceptible host plant than spearmint. These nematode populations were collected from four major mint growing areas of the United States (Idaho, Indiana, Oregon and Washington) with most populations obtained from Oregon and Washington. Usually no symptoms appear on the above ground parts of root-knot nematode infected plants. Therefore, it is possible that farmers in these areas may overlook infected mint planting stock and introduce the pest into new lands. Spread of the nematode could cause serious problems in mint and many other agricultural crops. Inoculation of peppermint cuttings and rhizomes with different densities of nematode egg masses caused varying degrees of root gall formation in three and four month growing periods. Regression slopes indicated that the relationships between inoculum densities and root gall formation was significant at the one percent level. However, inoculated rhizomes and the longer growing period caused more infection in plants. A gradual decline in plant vigor and productivity could be attributed to root-knot nematode infection which resulted in a significant shoot length reduction and reduced plant weights. Dry matter contents and concentrations of N, P, Mn, Fe and Al decreased, but there was a slight increase in Ca. Spearmint rhizomes inoculated with fresh second stage larvae of M. hapla produced equally severe galling in four months of growth regardless of the various initial inoculum densities. However, no significant relationships between inoculum densities and reduction in plant weights or shoot lengths developed in this host. Decreases in dry matter contents of spearmint plants as well as concentrations of chemical elements were similar to those of peppermint. A deterrent interaction between the fungus Verticillium dahliae Kleb. and M. hapla was observed when peppermint and spearmint plants were inoculated with the two pathogens. Significantly (at the one percent level) less root galls were formed when V. dahliae was combined with different densities of M. hapla larvae. Also interaction between fungus and nematode caused longer incubation periods and less severe Verticillium wilt disease symptoms. Weight reductions due to such interaction were insignificant and the data indicate that peppermint was more susceptible to the pathogens than spearmint. It can be concluded that M. hapla can infect both peppermint and spearmint without showing obvious disease symptoms on aerial parts of plants. Therefore, infections can remain unnoticed particularly in spearmint which has more tolerance to the nematode Introduction of root-knot nematode infected planting stock to new planting sites or other fields spreads the parasite which will affect other agricultural crops. Also suppression of Verticillium wilt disease symptoms by the nematodes could complicate or delay early diagnosis and control of wilt disease. Close

• 7. [Article] Evaluation of the FDA derived intervention levels and exposure rate of 0.4 µR/hr using NARAC Web Atmosphere and Diffusion Modeling System

  The Oregon Department of Energy has set up recommendations for agricultural crop and non-crop embargo zones following an accidental or purposeful radioactive release. Of special interest are the FDA’s ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of the FDA derived intervention levels and exposure rate of 0.4 µR/hr using NARAC Web Atmosphere and Diffusion Modeling System Author: Hay, Tristan Ryan The Oregon Department of Energy has set up recommendations for agricultural crop and non-crop embargo zones following an accidental or purposeful radioactive release. Of special interest are the FDA’s Derived Intervention Levels (DIL) and the state’s exposure limit of 0.4µR/hr. At the Oregon State University Emergency Response Research and Support Lab, NARAC Web Atmosphere and Diffusion Modeling System is used to generate consequences from possible radiation release accident scenarios. Using scenario and NARAC outputs, the DIL and exposure are calculated and compared to the recommended DIL and exposure limits. Analysis of these calculations reveals a wide assortment of dissimilarities in the recommended limits for which the embargo zones are set. Title: Evaluation of the FDA derived intervention levels and exposure rate of 0.4 µR/hr using NARAC Web Atmosphere and Diffusion Modeling System Author: Hay, Tristan Ryan The Oregon Department of Energy has set up recommendations for agricultural crop and non-crop embargo zones following an accidental or purposeful radioactive release. Of special interest are the FDA’s Derived Intervention Levels (DIL) and the state’s exposure limit of 0.4µR/hr. At the Oregon State University Emergency Response Research and Support Lab, NARAC Web Atmosphere and Diffusion Modeling System is used to generate consequences from possible radiation release accident scenarios. Using scenario and NARAC outputs, the DIL and exposure are calculated and compared to the recommended DIL and exposure limits. Analysis of these calculations reveals a wide assortment of dissimilarities in the recommended limits for which the embargo zones are set. Close

• 8. [Article] Vegetation characterization of three contrasting riparian areas : Williamette Valley, Oregon

  Much of the native riparian vegetation of the Willamette Valley, Oregon, has been replaced with agricultural crops or invasive non-native plant species. Detailed information about current Willamette Valley ...

  Citation × Citation Citation Abstract Copy Title: Vegetation characterization of three contrasting riparian areas : Williamette Valley, Oregon Author: McAllister, Lynne S., Dwire, Kathleen A., Griffith, Stephen M. Much of the native riparian vegetation of the Willamette Valley, Oregon, has been replaced with agricultural crops or invasive non-native plant species. Detailed information about current Willamette Valley riparian vegetation is generally lacking. Plant specie composition data are useful in a variety of applications, including condition assessment, environmental monitoring and restoration planning. The objective of this study was to characterize the vegetation of three contrasting riparian sites occurring in the Willamette Valley. W determined plant species composition and abundance at a non-cultivated herbaceous site and a cultivated site, both located along Lake Creek, an intermittent stream, and at a forested site located along the Calapooia River, a perennial stream. All sites were adjacent to intensively-managed perennial ryegrass seed production fields. Crop agriculture strongly encroached on the Lake Creek sites, whereas the Calapooia site had received little encroachment from agricultural coversion. At Lake Creek, we inventoried 32 species at the non-cultivated herbaceous site and 18 species at the cultivated site, most of which were non-native. The cultivated site was dominated by wetland-adapted species in the area closest to the creek where perennial ryegrass was absent. Approximately half of the species at the non-cultivated herbaceous site were facultative upland species, and the site was dominated by introduced pasture grasses. In contrast, the 53 species inventoried at the forested site were mostly native and wetland-adapted. The forested site was dominated by Poplus balsamifera ssp, trichocarap T. & G., Pseudotsuga menziessii (Mirbel) Franco, and Acer macrophyllum Pursh, with extensive shrub and herbaceous strata. Results show a range of vegetative conditions found in riparian areas of the Willamette Valley and reflect the influence of differing hydrologic regimes and agricultural impacts. Title: Vegetation characterization of three contrasting riparian areas : Williamette Valley, Oregon Author: McAllister, Lynne S., Dwire, Kathleen A., Griffith, Stephen M. Much of the native riparian vegetation of the Willamette Valley, Oregon, has been replaced with agricultural crops or invasive non-native plant species. Detailed information about current Willamette Valley riparian vegetation is generally lacking. Plant specie composition data are useful in a variety of applications, including condition assessment, environmental monitoring and restoration planning. The objective of this study was to characterize the vegetation of three contrasting riparian sites occurring in the Willamette Valley. W determined plant species composition and abundance at a non-cultivated herbaceous site and a cultivated site, both located along Lake Creek, an intermittent stream, and at a forested site located along the Calapooia River, a perennial stream. All sites were adjacent to intensively-managed perennial ryegrass seed production fields. Crop agriculture strongly encroached on the Lake Creek sites, whereas the Calapooia site had received little encroachment from agricultural coversion. At Lake Creek, we inventoried 32 species at the non-cultivated herbaceous site and 18 species at the cultivated site, most of which were non-native. The cultivated site was dominated by wetland-adapted species in the area closest to the creek where perennial ryegrass was absent. Approximately half of the species at the non-cultivated herbaceous site were facultative upland species, and the site was dominated by introduced pasture grasses. In contrast, the 53 species inventoried at the forested site were mostly native and wetland-adapted. The forested site was dominated by Poplus balsamifera ssp, trichocarap T. & G., Pseudotsuga menziessii (Mirbel) Franco, and Acer macrophyllum Pursh, with extensive shrub and herbaceous strata. Results show a range of vegetative conditions found in riparian areas of the Willamette Valley and reflect the influence of differing hydrologic regimes and agricultural impacts. Close

• 9. [Article] Evaluating honey bee colonies for pollination : a guide for growers and beekeepers

  Declared out of print July 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate....

  Citation × Citation Citation Abstract Copy Title: Evaluating honey bee colonies for pollination : a guide for growers and beekeepers Author: Mayer, D. F., Washington State University. Cooperative Extension, Pacific Northwest Cooperative Extension, United States. Dept. of Agriculture, Fisher, Glenn C., Oregon State University. Extension Service, Burgett, D. M., University of Idaho. Cooperative Extension Service, Johansen, C. A. (Carl A.) Declared out of print July 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Evaluating honey bee colonies for pollination : a guide for growers and beekeepers Author: Mayer, D. F., Washington State University. Cooperative Extension, Pacific Northwest Cooperative Extension, United States. Dept. of Agriculture, Fisher, Glenn C., Oregon State University. Extension Service, Burgett, D. M., University of Idaho. Cooperative Extension Service, Johansen, C. A. (Carl A.) Declared out of print July 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 10. [Article] Estimating crop yield and production changes as a function of irrigation deficit based on watershed and county level data

  Response of agricultural crops to irrigation water deficit is well-understood at the field scale. Broader scale (watershed and county levels) studies have been less frequently performed. Data collection ...

  Citation × Citation Citation Abstract Copy Title: Estimating crop yield and production changes as a function of irrigation deficit based on watershed and county level data Author: Darakjian, Priscila Response of agricultural crops to irrigation water deficit is well-understood at the field scale. Broader scale (watershed and county levels) studies have been less frequently performed. Data collection at the field level for extensive areas is time consuming and expensive. The importance of studies at a broader scale for evaluating future scenarios of agricultural land use justifies exploring alternative approaches that produce reasonable results in a faster and more economical manner. The objective of this study was to verify the ability of coarser level data to provide general trends of changes in agricultural cropping patterns as a function of water use management in the Willamette basin. In this study, watershed and county level data were used to analyze broader scale crop water relationships, since these data are abundant and easily accessible. Further, future estimates of crop water use, based on estimates of yield and acreage changes , were attempted for a study period spanning current conditions (2000) through 2050. FAO Yield Response to Water Model was used to relate crop yield and production to applied irrigation water. Assumptions made to apply this model at the basin level related mostly to climatic factors and dynamic change of the system. Changes in maximum crop yield for all important crops grown in the Willamette basin were estimated using a logistic function parameterized with historic and current datasets. It was important to consider the dynamic system response when modeling the system to incorporate environmental, technological and socio-economic factors not reflected in the original model. The results for crop yield showed a decrease through time for sweet corn, stable yield for cherries, ryegrass, and grapes, and increasing yield for alfalfa, strawberries and raspberries. Crops showing higher sensitivity to water deficit included snap beans, winter and spring wheat, oats and filberts. Production estimates showed 3 groups of crops: predominantly successful (filberts, cherries, ryegrass, oats and spring wheat), stable (strawberries, alfalfa, orchardgrass, mint and fescue) and predominantly unsuccessful crops (winter wheat, sweet corn, snap beans and berries). County level and watershed level data proved helpful in developing a more comprehensive view of crop production and its irrigation deficit response, using models incorporating information from finer spatial scale experiments. Socio-economic, technologic and environmental variables that might influence agriculture over time should be investigated in further studies. Title: Estimating crop yield and production changes as a function of irrigation deficit based on watershed and county level data Author: Darakjian, Priscila Response of agricultural crops to irrigation water deficit is well-understood at the field scale. Broader scale (watershed and county levels) studies have been less frequently performed. Data collection at the field level for extensive areas is time consuming and expensive. The importance of studies at a broader scale for evaluating future scenarios of agricultural land use justifies exploring alternative approaches that produce reasonable results in a faster and more economical manner. The objective of this study was to verify the ability of coarser level data to provide general trends of changes in agricultural cropping patterns as a function of water use management in the Willamette basin. In this study, watershed and county level data were used to analyze broader scale crop water relationships, since these data are abundant and easily accessible. Further, future estimates of crop water use, based on estimates of yield and acreage changes , were attempted for a study period spanning current conditions (2000) through 2050. FAO Yield Response to Water Model was used to relate crop yield and production to applied irrigation water. Assumptions made to apply this model at the basin level related mostly to climatic factors and dynamic change of the system. Changes in maximum crop yield for all important crops grown in the Willamette basin were estimated using a logistic function parameterized with historic and current datasets. It was important to consider the dynamic system response when modeling the system to incorporate environmental, technological and socio-economic factors not reflected in the original model. The results for crop yield showed a decrease through time for sweet corn, stable yield for cherries, ryegrass, and grapes, and increasing yield for alfalfa, strawberries and raspberries. Crops showing higher sensitivity to water deficit included snap beans, winter and spring wheat, oats and filberts. Production estimates showed 3 groups of crops: predominantly successful (filberts, cherries, ryegrass, oats and spring wheat), stable (strawberries, alfalfa, orchardgrass, mint and fescue) and predominantly unsuccessful crops (winter wheat, sweet corn, snap beans and berries). County level and watershed level data proved helpful in developing a more comprehensive view of crop production and its irrigation deficit response, using models incorporating information from finer spatial scale experiments. Socio-economic, technologic and environmental variables that might influence agriculture over time should be investigated in further studies. Close