Poster Session

The 2019 Potato Research Poster Session are available for viewing throughout the Potato Expo.

Stop by the Poster Session on Wednesday, January 9 from 4:30pm-5:00pm to meet the presenters and learn more about how their research can benefit your operation. This is your opportunity to meet one-on-one to discuss how their findings could impact and improve your operation.

Coordination and selection is facilitated by the Potato Association of America.

Utilizing Remote Sensing to Manage Nitrogen and Optimize Yield for Potato
Brian Bohman, Research Assistant, University of Minnesota

Potato requires intensive nitrogen management to maximize yield quantity and quality. With superior temporal and spatial resolution, remote sensing has potential to supplement or replace existing methods to manage in-season nitrogen applications, such as petiole nitrate sampling. Crop nitrogen status can be estimated using remote sensing and the nitrogen nutrition index to produce actionable insights on the optimum nitrogen fertilizer rate to maximize agronomic production, as well as to forecast end-of-season crop yield and quality. This research forms the basis of a new and potentially commercializable precision agriculture technology solution for potato.

Redesigning Potato Breeding to a F1 Hybrid Variety at Michigan State University
David S. Douches, Ph.D., Professor; Director of MSU Potato Breeding and Genetics Program, Michigan State University
Joseph Coombs, Potato Variety & Entomology Research Technician, Michigan State University
Maher Alsahlany, Ph.D. Student, Michigan State University

Improving traits for a commercial variety through conventional breeding is a slow and challenging process due to the unpredictable inheritance of desirable traits. We used the dominant self-incompatibility inhibitor Sli gene from M6 (S. chacoense) to modify self-incompatible (SI) diploid species hybrids and cultivated dihaploids to self-compatible (SC) population pools that will be used to create diploid inbred lines for F1 potato hybrid varieties. We developed three germplasm pools through recurrent selection and backcross breeding methods to improve self-compatibility, photoperiod adaptability, and cultivated tuber traits. This self-compatible germplasm that will be the basis of our diploid breeding effort.

Genotype X Environment Interactions for Yield in the National Chip Processing Trial
Jeffrey Endelman, Ph.D., Assistant Professor of Potato Breeding and Genetics, University of Wisconsin-Madison

The National Chip Processing Trial (NCPT) is a collaborative effort between the public breeding programs and potato industry to identify clones for commercialization. Selection decisions in the NCPT are frequently made based on performance in Northern vs. Southern locations due to different emphases in these mega-environments, such as resistance to cold-induced sweetening vs. internal heat necrosis. To investigate how well the North/South conceptual framework captures the true pattern of genotype x environment interaction for total yield, the genetic correlation between each pair of locations was estimated based on six years of NCPT data.

Effect of Nitrogen Fertilization on Cold-Induced Sweetening in Potato Tubers During Storage
Sanjay K. Gupta, Ph.D., Researcher, University of Minnesota
Emerson F. C. Souza, Ph.D., Researcher, University of Minnesota
Carl J. Rosen, Ph.D. Department of Soil, Water and Climate, University of Minnesota

Nitrogen (N) fertilizer is used routinely in potato cultivation to optimize yield. However, the role of N fertilization on potato post-harvest storage and reducing sugar accumulation is less conclusive. Data collected from a greenhouse study have shown increased levels of leaf chlorophyll, higher biomass, increased soluble proteins and reduced partitioning of fresh weight to tubers in response to increasing N rate. Results from a field study conducted in 2018 involving four cultivars grown under three N fertilizer regimes will be presented. The information generated could help commercial growers to manage N fertilizer for optimum economic yield and processing quality.

The Potato Association of America, a Professional Society for Advancement of the Potato Industry
Kent F. McCue, Ph.D., Research Geneticist, USDA-Agricultural Research Service

The Potato Association of America collects and disseminates scientific information relating to all phases of the potato industry, including, but not limited to, teaching, research, outreach, breeding, certification, production, pests, transportation, processing, and marketing and utilization. The Association is: to be the leading voice for science-based information about the potato; to foster strong partnerships between international and national potato professionals; and to have a dynamic, engaged and diverse membership and support the activities of membership groups.

Solanum sisymbriifolium as a Trap Crop for Globodera pallida: Economic Considerations
Christopher S.McIntosh, Ph.D., Professor of Agricultural Economics, University of Idaho

The pale cyst nematode (PCN), Globodera pallida, has been causing economic and pest control problems in Idaho since it was discovered in 2006. Currently, there are 9,333 acres under regulatory and a total of 27 infested fields. Although the current eradication program is keeping PCN contained to Bingham and Bonneville county, it has not yet eradicated PCN from all fields. Thus, not allowing growers to grow their most profitable crop, potatoes. Simulations including cost and net present value considerations show that using Solanum sisymbriifolium, as a trap crop to eradicate PCN is cost-effective.

Is the Interval Between Phosphite Fungicide Application and Irrigation Important for Pink Rot Control?
Trent Taysom, Research Scientist, Miller Research LLC

Phosphite fungicides are commonly used for pink rot management. A report from Canada indicated that 48 hours were needed to maximize absorption of phosphite by the potato plant. So does the interval between application and irrigation need to be 48 hours? A study was conducted in southern Idaho evaluating the intervals of 48, 24, 12, and 6 hours between phosphite fungicide application and irrigation. Phosphite fungicide (Resist 57, 10 pt/acre) applied 6 hours prior to irrigation were not as effective in reducing pink rot as applications made 12, 24, or 48 hours before irrigation which all reduced pink rot similarly.

Improving Potato Uniformity with Plant Growth Regulators
Andy Robinson,Ph.D., Extension Potato Agronomist, North Dakota State University
Mitchell Bauske, Ph.D. Extension Potato Agronomist, University of Minnesota

The application of plant growth hormones is commonly used to improve seed tuber emergence. The purpose of this study was to determine how combinations of gibberellic acid (GA), cytokinin, indole-3-butyric acid (IBA), and naphthaleneacetic acid (NAA) would affect 10 potato cultivars and mini-tuber clones in field studies performed in North Dakota in 2017 and 2018. Stem numbers in Dakota Russet, Sangre, Ivory Crisp and Atlantic increased with treatments when compared to the non-treated controls. The plant growth hormones increased tuber size of Sangre potatoes and caused a significant increase in tuber length-width ratios of Dakota Russet and ND8068-Russ.

Identifying Resistance to Potato Virus Y in NDSU Potato Germplasm Using Marker Assisted Selection
Asunta (Susie) Thompson, Ph.D., Associate Professor/Potato Breeder, North Dakota State University

Potato virus Y (PVY) is linked to certified seed lot rejections, reduced tuber size and total yield, and tuber necrosis. Losses may be avoided by using integrated pest management practices, including resistant cultivars. One hundred fifty-four clones from the North Dakota State University (NDSU) potato breeding program were evaluated using marker assisted selection (MAS). Genotypes were screened using the SCAR marker RYSC3, for the presence of the Ryadg gene, which confers resistance to PVY. ND102917C-1, an advancing chip selection, amongst others, possessed the marker. Identifying genotypes possessing the marker speeds the release of PVY resistant cultivars.

Modeling the Impact of the Pale Cyst Nematode (Globodera pallida) on Potato Yield
Michael Thornton, Ph.D., Professor of Plant Science, Parma Research and Extension Center

Globodera pallida is a quarantine pest in the state of Idaho where it was found in 2006. A SUBSTOR-DSSAT model was used to predict G. pallida impact on potato yield. The model showed that tubers reached a maximum yield of 694 cwt/acre in non-infested soil. Based on two greenhouse trials, the model predicted an 87% and 38% yield loss in trial 1 and trial 2 respectively, when initial nematode density was 80 eggs/g soil. This study should facilitate common understandings between regulators, policymakers and potato growers on the challenges and opportunities for controlling this economically important pest in Idaho.

Potato Virus Y Necrotic Tuber Symptoms in Varieties from Different Market Classes
Jonathan Whitworth, Ph.D., Researcher, USDA-Agricultural Research Service
Stewart Gray, Ph.D., Research Plant Pathologist, USDA-Agricultural Research Service
Alexander Karasev, Ph.D., Professor University of Idaho

Strains of Potato virus Y (PVY) can damage tubers and make then unmarketable. The composition of strains has changed since the early 2000s, when damaging strains were found in Canada and the U.S. Now, PVYNTN has become the predominant strain in eastern Canada, and PVYNwi has become predominant in the Pacific Northwest. Not all PVY susceptible varieties show these symptoms, so this study was done to look at many varieties in different market classes to assess risk for tuber damage. Tuber damage is usually caused by PVYNTN, but this research shows that some PVYNwi isolates also cause tuber damage.

Lessons from Six Years of Potato Psyllid monitoring in the Columbia Basin of Washington
Carrie H. Wohleb, Ph.D., Associate Professor and Regional Vegetable Specialist, Washington State University

Zebra chip is an important disease that is transmitted by an insect known as a potato psyllid. The disease was first reported in the Columbia Basin in 2011 when several potatoes showed symptoms of zebra chip and two fields were completely destroyed by the disease. In 2012, we initiated a regional monitoring program to help growers know when and where to look for potato psyllids. The monitoring program is helping us understand potato psyllid population dynamics in the region. This includes the timing of psyllid arrivals in potatoes, migratory patterns and spatial distribution, and season-to-season variability in population size.