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30 POTATO GROWER | SEPTEMBER 2018 Diggin' In Diggin' In DISEASE| Amanda Saville & Jean Ristaino, North Carolina State University The role of calcium in potato quality and production Doppelgänger Due to the recent run of warm, wet weather in the Southeast this summer, conditions were ideal for the development of late blight (caused by the pathogen Phytophthora infestans) on potato and tomato crops. Extension potato specialists received samples exhibiting late blight-like symptoms on tomato and potato. However, further evaluation of these samples has shown that these infections on both tomato and potato were caused by a related species, Phytophthora nicotianae. While normally a soil-borne pathogen, the presence of foliar lesions indicates that the pathogen has also spread aerially. In eastern North Carolina, severe foliar infections have been observed. The severe wet weather and high temperatures were highly favorable for the pathogen that, unlike P. infestans, is most severe under cool weather conditions. As of this writing (July 23), P. infestans has not been reported in North Carolina in 2018, though it has been reported in other eastern states, including Florida, New York, Pennsylvania and Maryland. When you put your hard earned money down for a new potato trailer, why not put it down one that will work as hard as you? Western potato trailers deliver on average 2000 lbs more than the competition couple that with the highest resale values in the industry and you can't go wrong. Learn more at www.westerntrailer.com or call 888.344.2539 Building the best and making it better…your way! 1958-14WesternTrailers 12h.indd 1 7/2/18 8:05 AM Phytophthora infestans look-alike causing disease pressure in North Carolina