Progress 07/01/09 to 06/30/14
Outputs
Target Audience: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided? Attended the 98th Annual Potato Association of America, Spokane, WA, USA, July 27- July 31, 2014. How have the results been disseminated to communities of interest? Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included fifteen presentations at international, regional, national and local meetings, one Extension bulletins, three extension trade journal and proceedings article publications, three abstracts, website updates and one-on-one visitations. Information was presented to an advisory stakeholder group and input was incorporated into the projects. What do you plan to do during the next reporting period to accomplish the goals?
Nothing Reported
Impacts
What was accomplished under these goals?
Research studies evaluated the effects of storage temperatures for various cultivars, and post-harvest product applications for disease control in storage. Products investigated included fungicides, disinfectants, and bio-control agents for Fusarium dry rot, pink rot, Pythium, and silver scurf disease control in storage. Research continued to evaluate the post-harvest application of azoxystrobin, difenconazole, fludioxonil and product mixtures on susceptible varieties to dry rot, late blight, and silver scurf. These were combined with novel bio-control agents for the suppression of Fusarium dry rot in storage. The bio-control agents alone or in combination with other post-harvest products may become another tool for disease control in storage. Commercial development is being investigated. We continue to evaluate the use of phosphorous acid as a post-harvest product alone and in combination with other post-harvest products to use not only for late blight and pink rot but also for the control of Pythium leak. There was limited success in this product use on Pythium leak. We emphasized that these post-harvest products must be used in combination with good storage management practices. To provide research to support these statements, we continued to evaluate variety susceptibility and handling and storage management decisions that may impact disease control in the early part of the storage season. Information was disseminated on the lack of impact of storage temperature on silver scurf incidence. Research on disease development and outcomes are incorporated into overall disease control programs communicated to the industry. Late blight plagued eastern Idaho in 2014 which comprises approximately 60% of the state acreage. Recommendations on controlling late blight in storage were disseminated based upon research performed with these studies. A majority of the growers in that region applied a post-harvest application of phosphorous acid with the outcome of being able to store the potatoes longer than anticipated with such a disease pressure.
Publications
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2014
Citation:
Schisler, D.A., P.J. Slininger, N.L. Olsen, M.A. Shea-Andersh, and L. Woodell. 2014. Evaluation of methods and carriers for formulation Gram-negative biocontrol agents active against potato dry rot in storage. American Phytopathological Society abstracts for 2014 APS-CPS Joint Meeting.
- Type:
Conference Papers and Presentations
Status:
Awaiting Publication
Year Published:
2015
Citation:
Woodell, L., N. Olsen and P.B. Hamm. 2014. Silver scurf incidence and severity at four storage temperatures. American Journal of Potato Research (in press).
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2014
Citation:
Olsen, N., P. Hamm, J. Miller, L. Woodell and P. Nolte. 2014. Silver scurf management post-harvest. 2014 Proceedings of the Washington-Oregon Potato Conference. Pp. 29-32.
- Type:
Websites
Status:
Published
Year Published:
2014
Citation:
Miller, J. and N. Olsen. 2014. Checklist for Managing Late Blight Approaching Harvest and Into Storage. Posted on PNWPestAlert.net September 4, 2014.
- Type:
Other
Status:
Published
Year Published:
2014
Citation:
Nolte, P. and N. Olsen. 2014. Leaked Information: Pythium leak managed with low pulp temperatures. Potato Grower Magazine. December 2014. Vol. 43 (12): 46-47.
- Type:
Other
Status:
Published
Year Published:
2015
Citation:
Brandt, T, N. Olsen, J. Stark, R. Novy, and J. Whitworth. 2015. Storage Management of Teton Russet. University of Idaho Extension CIS 1216.
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Progress 01/01/13 to 09/30/13
Outputs
Target Audience: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided? Attended the 97th Annual Potato Association of America, Quebec City, Quebec, Canada, July 28- August 1, 2013. How have the results been disseminated to communities of interest? Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included eight presentations at international, regional, national and local meetings, two Extension bulletins, three extension trade journal and proceedings article publications, website updates and one-on-one visitations. Information was presented to an advisory stakeholder group and input was incorporated into the projects. What do you plan to do during the next reporting period to accomplish the goals? The final year of research will be finalized and information disseminated as needed. A trial evaluating the use of biocontrol agents will be investigated on a larger scale to better understand utilization in the industry. Additional products will be evaluated for disease control using novel application techniques.
Impacts
What was accomplished under these goals?
Research studies continued to evaluate the effects of pre-harvest vine kill, handling situations (eg. pulp temperatures and wounding) for various cultivars, and post-harvest product applications for disease control in storage. Products investigated included fungicides, disinfectants, and biocontrol agents for Fusarium dry rot, pink rot, Pythium, and silver scurf disease control in storage. Research continued to evaluate the post-harvest application of azoxystrobin, difenconazole fludioxonil and product mixtures. These products will help for post-harvest suppression of dry rot, late blight, and silver scurf. We continue to evaluate the use of phosphorous acid as a post-harvest product alone and in combination with other post-harvest products to use not only for late blight and pink rot but also for the control of Pythium leak, silver scurf and black dot. We emphasize that these post-harvest products must be used in combination with good storage management practices. To provide research to support these statements, we continued to evaluate handling and storage management decisions that may impact disease control in the early part of the storage season. A study was initiated to evaluate means to reduce Fusarium dry rot disease development in storage. In this study, two varieties were assessed under 3 vine kill conditions. In summary, there were limited differences between vine kill treatments on quality and yield; although some negative characteristics with a greater vine kill duration was seen. Holding temperatures had no impact on Fusarium dry rot development and should not be a concern when deciding on holding temperatures. We continued to look at the use of phosphorous acid for silver scurf and black dot control and answer on-going questions regarding this use. Additional uses of phosphorous acid for silver scurf control both in-furrow, seed treatment or post-harvest treatments were investigated in collaboration with Oregon State University. The incidence of silver scurf on Russet Norkotah was significantly decreased with a post-harvest application of phosphorous acid regardless of product. A lower rate and volume of phosphorous acid was not as consistent in controlling silver scurf as the higher rates and volume of application. Post-harvest application of phosphorous acid is a very efficient tool to reduce the potential for silver scurf development in storage. It did not affect the incidence of black dot. Research is on-going regarding the impacts of handling and storage conditions on disease development and outcomes are incorporated into overall disease control programs communicated to the industry.
Publications
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Progress 01/01/12 to 12/31/12
Outputs
OUTPUTS: Research studies continued to evaluate the effects of pre-harvest vine kill, handling situations (eg. pulp temperatures and wounding) for various cultivars, and post-harvest product applications for disease control in storage. Products investigated included disinfestants, fungicides and biocontrol agents for Fusarium dry rot and silver scurf disease control in storage. Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included one journal article, thirteen presentations at international, regional, national and local meetings, four extension trade journal and proceedings article publications, website updates and one-on-one visitations. Information was presented to an advisory stakeholder group and input was incorporated into the projects. PARTICIPANTS: University of Idaho participants include Mary Jo Frazier, Support Scientist; Lynn Woodell, Support Scientist; Maria Chavez, Temporary Help; Phill Wharton, Assistant Professor. Other participants: Jeff Miller, Miller Research; Pat Slininger, USDA/ARS; Dave Schisler, USDA/ARS; Philip Hamm, Oregon State University. Additional funding sources: Idaho Potato Commission, USDA/ARS, Syngenta, and Gowan Company. Input was sought from the University of Idaho Kimberly Potato Storage Advisory Committee. This committee is comprised of industry representatives and growers from Idaho. TARGET AUDIENCES: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. PROJECT MODIFICATIONS: Nothing significant to report during this reporting period.
Impacts
Storage disease control, especially for late blight, pink rot, Pythium leak, black dot, dry rot and silver scurf, are of great concern to the Idaho potato industry therefore research effort is focused on disease control in storage. Research continued to evaluate the post-harvest application of azoxystrobin, difenconazole fludioxonil and product mixtures are being pursued by the registrant for US registration. The registrant is relying upon our research results and advice for further development of the post-harvest products. These products will help for post-harvest suppression of dry rot, late blight, and silver scurf. We continue to evaluate the use of phosphorous acid as a post-harvest product to use not only for late blight and pink rot but also for the control of silver scurf and black dot. We emphasize that these post-harvest products must be used in combination with good storage management practices. To provide research to support these statements, we continued to evaluate handling and storage management decisions that may impact disease control in the early part of the storage season. A study was initiated to evaluate means to reduce Fusarium dry rot disease development in storage. In this study, two varieties were assessed under 3 vine kill conditions (no, 2-week and 4-week dead vines). In summary, there were limited differences between vine kill treatments on quality and yield although additional growing seasons in conjunction with treatment response in storage is warranted. We continued to look at the use of phosphorous acid for silver scurf and black dot control and answer on-going questions regarding this use. Additional uses of phosphorous acid for silver scurf control both in-furrow, seed treatment or post-harvest treatments were investigated in collaboration with Oregon State University. Rate of plant emergence was impacted by seed treatment applications of phosphorous acid. Initial results indicate phosphorous acid should not be applied as a seed treatment and this application did not impact silver scurf or black dot development on daughter tubers. The incidence of silver scurf on Russet Norkotah after 101 days in storage was significantly decreased with a post-harvest application of phosphorous acid regardless of rate, volume or product except in two treatments. Applying water to the tubers void of phosphorous acid increased the incidence of silver scurf. A higher rate of phosphorous acid tended to lessen the incidence of silver scurf compared to the lower rates. The severity of silver scurf was significantly lower with the highest rate of phosphorous acid applied. After approximately 6 months in storage a higher incidence of silver scurf was observed compared to 3 months in storage and limited differences between treatments were observed indicating a potential limitation in the use of post-harvest applied phosphorous acid for long-term silver scurf control in storage. Research is on-going regarding the impacts of handling and storage conditions on disease development and outcomes are incorporated into overall disease control programs communicated to the industry.
Publications
- Yilma, S., Vales, M., Charton, B.A., Hane, D.C., James, S.R., Shock, C.C., Mosley, A.R., Culp, D., Feibert, E., Leroux, L., Karaagac, E., Knowles, N., Pavek, M., Stark, J.C., Novy, R.G., Whitworth, J.L., Pavek, J.J., Corsini, D.L., Brandt, T.L., Olsen, N. and Brown, C.R. 2012. Owyhee Russet: A variety with high yields of U.S. no. 1 tubers, excellent processing quality, and moderate resistance to Fusarium dry rot (Fusarium solani var. coeruleum). American Journal of Potato Research. 89:175-183.
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Progress 01/01/11 to 12/31/11
Outputs
OUTPUTS: Research studies continued to evaluate the effects of pre-harvest vine kill, handling situations (eg. pulp temperatures and wounding) for various cultivars, and post-harvest product applications for disease control in storage. Products investigated included disinfestants, fungicides and biocontrol agents for Fusarium dry rot and silver scurf disease control in storage. Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included one journal article, ten presentations at international, regional, national and local meetings, four extension trade journal and proceedings article publications, website updates and one-on-one visitations. Information was presented to an advisory stakeholder group and input was incorporated into the projects. PARTICIPANTS: University of Idaho participants include Mary Jo Frazier, Support Scientist; Lynn Woodell, Support Scientist; Maria Chavez, Temporary Help; Phil Nolte, Professor; Phill Wharton, Assistant Professor. Other participants: Jeff Miller, Miller Research; Pat Slininger, USDA/ARS; Dave Schisler, USDA/ARS; Philip Hamm, Oregon State University. Additional funding sources: Idaho Potato Commission, USDA/ARS, Syngenta, Actagro and Gowan Company. Input was sought from the University of Idaho Kimberly Potato Storage Advisory Committee. This committee is comprised of industry representatives and growers from Idaho. TARGET AUDIENCES: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. PROJECT MODIFICATIONS: Nothing significant to report during this reporting period.
Impacts
Storage disease control, especially for late blight, pink rot, Pythium leak, black dot, dry rot and silver scurf, are of great concern to the Idaho potato industry therefore research effort is focused on disease control in storage. Research continued to evaluate the post-harvest application of azoxystrobin, difenconazole fludioxonil and product mixtures are being pursued by the registrant for US registration. The registrant is relying upon our research results and advice for further development of the post-harvest products. These products will help for post-harvest suppression of dry rot, late blight, and silver scurf. We continue to evaluate the use of phosphorous acid as a post-harvest product to use not only for late blight and pink rot but also for the control of silver scurf and black dot. Our previous storage disease control research results have been widely requested by the industry and we continue to evaluate various products, both fungicides and biopesticides, which may contribute to disease control in storage. We emphasize that these post-harvest products must be used in combination with good storage management practices. To provide research to support these statements, we continued to evaluate handling and storage management decisions that may impact disease control in the early part of the storage season. A study was initiated to evaluate means to reduce Fusarium dry rot disease development in storage. Previous research indicated pulp temperatures and vine kill conditions (eg. maturity) influence Fusarium dry rot development in storage, although altering vine kill management to minimize dry rot may impact other yield and quality components, and those consequences need to be evaluated. In this study, two varieties were assessed under 3 vine kill conditions (no, 2-week and 4-week dead vines). The impact of vine kill and handling and storage conditions on Fusarium dry rot will be assessed later in the storage season and will be reported at a later date. Applications of post-harvest products were made to Fusarium inoculated tubers and will be evaluated during the storage season. We continued to look at the use of phosphorous acid for silver scurf and black dot control and answer on-going questions regarding this use. Additional uses of phosphorous acid for silver scurf control both in-furrow, seed treatment or post-harvest treatments are being investigated in collaboration with Oregon State University. Rate of plant emergence was impacted by seed treatment applications of phosphorous acid. Additional season of evaluation is necessary to better understand the potential impact of the various methods of phosphorous acid applications in the field. Research is on-going regarding the impacts of handling and storage conditions on disease development and outcomes are incorporated into overall disease control programs communicated to the industry.
Publications
- Miller, J.S., Hamm, P.B., Olsen, N., Geary B., and Johnson, D.A. 2011. Effect of Post-harvest Fungicides and Disinfectants on the Suppression of Silver Scurf on Potatoes in Storage. American Journal of Potato Research 88:413-423.
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Progress 01/01/10 to 12/31/10
Outputs
OUTPUTS: Research studies were initiated to evaluate the effects of pre-harvest vine kill, handling situations (eg. pulp temperatures and wounding) for various cultivars, and post-harvest product applications for disease control in storage. Products investigated included disinfestants, fungicides and biocontrol agents for disease control in storage. Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included ten presentations at international, regional, national and local meetings, two extension trade journal and proceedings article publications, website updates and one-on-one visitations. Information was presented to an advisory stakeholder group and input was incorporated into the projects. PARTICIPANTS: University of Idaho participants include Mary Jo Frazier, Support Scientist; Lynn Woodell, Support Scientist; Maria Chavez, Temporary Help; Phil Nolte, Professor; Phill Wharton, Assistant Professor. Other participants: Jeff Miller, Miller Research; Pat Slininger, USDA/ARS; Dave Schisler, USDA/ARS; Philip Hamm, Oregon State University. Additional funding sources: Idaho Potato Commission, USDA/ARS, Syngenta, Actagro and Gowan Company. Input was sought from the University of Idaho Kimberly Potato Storage Advisory Committee. This committee is comprised of industry representatives and growers from Idaho. TARGET AUDIENCES: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. PROJECT MODIFICATIONS: Not relevant to this project.
Impacts
Storage disease control, especially for pink rot, dry rot and silver scurf, are of great concern to the Idaho potato industry therefore research effort focused on disease control strategies for these diseases in storage. Research continued to evaluate the post-harvest application of azoxystrobin, difenconazole fludioxonil and product mixtures are being pursued by the registrant for US registration. The registrant is relying upon our research results and advice for further development of the post-harvest products. These products will help for post-harvest suppression of dry rot, late blight, and silver scurf. We continue to evaluate the use of phosphorous acid as a post-harvest product to use not only for late blight and pink rot but also for the control of silver scurf. Data from these projects were used to include silver scurf suppression on the label for a phosphorous acid product in the US. This data is currently being used for the registration of the product for silver scurf control in Canada. Our previous storage disease control research results have been widely requested by the industry and we continue to evaluate various products, both fungicides and biopesticides, which may contribute to disease control in storage. We emphasize that these post-harvest products must be used in combination with good storage management practices. Research is on-going regarding the impacts of handling and storage conditions on disease development and outcomes are incorporated into overall disease control programs communicated to the industry. For example the following results allowed for specific recommendations regarding the harvest, handling and storage of Premier Russet, a variety susceptible to dry rot and pink rot development in storage. Dry rot was significantly more severe in potatoes will pulp temperatures of 45F compared to 55 or 65F. A second study evaluated Fusarium dry rot and pink rot disease development of Premier Russet of different maturities (3 vine kill timings: green dig, 2 week and 4 week dead vines). There were significant differences between vine kill treatments in dry rot disease development. Tubers harvested under 4 week dead vines had significantly lower incidence and severity of dry rot compared to the other vine kill treatments. In general, Premier Russet potatoes stored at 42F had a lower incidence and severity of dry rot compared to 45F storage. There were no differences in pink rot disease development due to vine kill treatment. Another study was initiated to look at wounded and non-wounded tuber susceptibility to pink rot. Post-harvest products were also evaluated. An application of phosphorous acid controlled pink rot regardless if wounding occurred or not. Gentle wounding of Premier Russet potatoes increased the incidence and severity of pink rot development indicating care needs to be taken when handling Premier Russet.
Publications
- Slininger, P.J., D.A Schisler, M.A. Shea-Andersh, J.M. Sloan, L.K Woodell, M.J. Frazier and N. Olsen. 2010. Multi-strain co-cultures surpass blends for broad spectrum biological control of maladies of potatoes in storage. Biocontrol Science and Technology 20:763-786.
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Progress 07/01/09 to 12/31/09
Outputs
OUTPUTS: Research studies were initiated to evaluate the effects of handling situations (eg. pulp temperatures and wounding) for various cultivars and post-harvest product applications on disease development in storage. Products investigated included disinfestants, fungicides and biocontrol agents for disease control in storage. Initial research findings from these studies were disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry in multiple formats. These various means of dissemination included five presentations at local and regional meetings, one extension newsletter publication, website updates and one-on-one visitations. One presentation on organic methods of disease control in storage was made the University of Idaho Organic Cropping Systems Field day. Information was presented to an advisory stakeholder group and input was incorporated into the projects. PARTICIPANTS: University of Idaho participants include Mary Jo Frazier, Support Scientist; Lynn Woodell, Support Scientist; Maria Chavez, Temporary Help; Phil Nolte, Professor; Phill Wharton, Assistant Professor. Other participants: Jeff Miller, Miller Research; Pat Slininger, USDA/ARS; Dave Schisler, USDA/ARS. Additional funding sources: Idaho Potato Commission, USDA/ARS, Syngenta and Gowan Company. Input was sought from the University of Idaho Kimberly Potato Storage Advisory Committee. This committee is comprised of industry representatives and growers from Idaho. TARGET AUDIENCES: Research findings from these studies are disseminated to potato growers, storage managers, scientists, extension personnel and others related to the potato industry. These audiences are reached using various formats: presentations at the local, regional, national and international levels, workshops, trade journal articles, proceedings articles, journal articles, extension publications, website updates and one-on-one visitations. PROJECT MODIFICATIONS: Nothing significant to report during this reporting period.
Impacts
Storage disease control, especially for late blight, pink rot, dry rot and silver scurf, are of great concern to the Idaho potato industry therefore research effort focused on disease control strategies for these diseases in storage. Research was initiated to evaluate the post-harvest application of azoxystrobin and difenconazole and both products are being pursued by the registrant for registration. The registrant is relying upon our research results and advice for further development of the post-harvest products. We continue to evaluate the use of phosphorous acid as a post-harvest product to use not only for late blight and pink rot but also for the control of silver scurf. Our previous storage disease control research results have been widely requested by the industry and we continue to evaluate various products, both fungicides and biopesticides, which may contribute to disease control in storage. We emphasize that these post-harvest products must be used in combination with good storage management practices. Research is on-going on the impacts of handling and storage conditions on disease development and will be incorporated into overall disease control programs.
Publications
- No publications reported this period
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