Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32J U L Y / A U G U S T 2 0 1 6 POTATO GROWER 21 research trials, and is shared with research collaborators at NDSU and with research and industry collaborators in North Dakota, Minnesota, and across North America. Additionally, several selections from the INIA program at Osorno, Chile are being increased and evaluated for adaptation in collabora- tion with Drs. Gary Secor and Julio Kalazich, the INIA potato breeder. NDSU Plant Pathology Dr. Guiping Yan, NDSU Project Title: Identify the cause of pota- to emergence disorder for infested fields in Minnesota. Plant-parasitic nematodes and plant-pathogenic fungi restrict potato production causing economic losses on potato when acting alone, but even more severe losses when interact- ing. A potato emergence disorder has been getting worse each year for some fresh market potato growers in Minnesota. They have experienced nearly 90% yield loss in some areas due to emergence disorder of potato plants over the past several years; less than 10% plants emerged in the infested fields. The affected plants were very small and the roots and lower stems had severe internal and external browning symptoms. Many soil and agronomic factors (soil pH, nutrient, herbicide, fer- tilizer, seed treatment) were examined but excluded as the reasons for causing this problem. From the preliminary tests the fungal pathogen Fusarium oxysporum was found to be present in many samples from the infested fields and the root- lesion nematode Pratylenchus pene- trans levels were very high. The overall purpose of this research project is to confirm the nematode and fungal species and to determine and prove whether the interaction between nema- tode and fungal pathogen causes this problem. A microplot experiment to determine the effects of co-inoculation with the nematode and fungal species on emer- gence, growth and yield of potato is being conducted under field conditions in the Sand Plain Research Farm, Becker, Minnesota. This project was started in May 2016 and will be completed by June 2018.