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66 Potato Grower | NOVEMBER 2014 PULLMAN, Wash. — Washington State University researchers have discovered that a common potato virus and a fungus- like pathogen can work together to damage the crop. In a study published this summer, scientists found that potato virus S (PVS) breaks down late blight resistance in Corner pivot without reflex Up to 50 acres on a quarter section machine are at risk of under fertilization If you're running a center pivot with swing arm, your yield could be suffering significantly if your not adjusting your fertilizer rates in the corners. Introducing reflex ™ Proportional Injection Systems from Agri-Inject ™ , the leader in Variable Rate Fertigation ® for over 20 years. The automatic reflex system allows the injection pump to be precisely proportional to the flow of water, ensuring even fertilizer coverage on every square inch of your field. Don't get caught without reflex ™ , demand Intelligent Injection Control from Agri-Inject. Can you afford not to have reflex ™ ? Variable Rate Fertigation ® 5500 East Highway 34 Yuma, Colorado 80759 USA Toll Free: 800-446-5328 | Ph.: 970.848.5336 Toll Free Fax: 1.888.846.5328 | Fax: 970.848.5338 ApplyYourself@Agri-Inject.com www.agri-inject.com NEW FEATURES FOR 2014 Introducing Systems from Agri-Inject Variable Rate Fertigation The automatic reflex system allows the injection pump to be precisely proportional to the flow of water, ensuring even fertilizer coverage on every square inch of your field. ©2014 Agri-Inject, Inc. AI-103.indd 1 1/3/14 10:07 AM 145883AgrInj12v.indd 1 5/30/14 11:20 AM potato. The study is in the American Journal of Potato Research (Lin, Y-H., D.A. Johnson and H.R. Pappu. 2014. Effect of Potato virus S infection on late light resistance in potato. Amer. J. Potato Research). The implications will impact potato breeding programs, as they must now take the virus into consideration during breeding for potato late blight resistance, said Hanu Pappu, the Sam Smith Distinguished Professor in plant pathology. Pappu teamed with WSU colleague Dennis Johnson, professor of plant pathology, and Ph.D. student Yu-Hsuan Lin, now a postdoctoral fellow at Cornell University. More than half of the nation's potatoes are produced in the Pacific Northwest. The potato industry contributes over $3.5 billion annually to Washington State's economy. PVS is commonly found around the world and historically hasn't been a concern for growers in the U.S. "Now it's demanding attention because of its role in making late blight disease more severe," Pappu said. Lin developed an experimental system to test for the three-way interactions among potato, late blight pathogen and PVS. She validated the interactions under controlled conditions, and this platform will be useful for screening additional potato genotypes. diggin' in RESEARCH By Scott Weybright, Washington State University Damaging Duo Unlikely collaboration harms potato crop "We normally study how a plant interacts with a single pathogen. Now we have to find how two very different pathogens interact with each other and the plant."