|YELLAREDDYGARI, S.K.R - NORTH DAKOTA STATE UNIVERSITY|
|GUDMESTAD, NEIL - NORTH DAKOTA STATE UNIVERSITY|
Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/6/2018
Publication Date: 6/1/2018
Citation: Yellareddygari, S., Whitworth, J.L., Gudmestad, N.C. 2018. Assessing potato cultivar sensitivity to tuber necrosis caused by Potato mop-top virus. Plant Disease. 102(6):1148-1153. https://doi.org/10.1094/PDIS-10-17-1585-RE.
Interpretive Summary: Assessing potato cultivar sensitivity to tuber necrosis caused by Potato mop-top virus S.K.R. Yellareddygari, Jonathan L. Whitworth, and Neil C. Gudmestad. Interpretive Summary Potato tubers infected with Potato mop-top virus (PMTV) can develop necrotic brown arcs and rings, reducing the tuber quality and increasing economic loss. Little is known about potato variety sensitivity to these symptoms. Sixty three varieties representing all market-types were planted in trials in North Dakota. Results showed that there were three categories of symptoms; sensitive (developed symptoms), insensitive (no symptoms), and moderately sensitive/insensitive. Thirty nine varieties were classified as insensitive with low PMTV incidences, while four varieties; Bannock Russet, Gemstar Russet, Lelah, and Waneta were recorded as insensitive and showed no incidence of PMTV over two years. Results will help growers determine which varieties can be planted and grown without the risk of virus symptoms when planted into a field with a history of PMTV associated tuber necrosis.
Technical Abstract: mop-top virus S.K.R. Yellareddygari, Jonathan L. Whitworth, and Neil C. Gudmestad. Technical Abstract Potato mop-top virus (PMTV) causes potato mop top disease in potato. This disease can result in a decline in tuber quality causing economic losses to growers due to the production of necrotic lesions and discolored tissue in infected tubers. Due to the soilborne nature of PMTV, identifying and developing host resistance against the virus is considered the best disease management option. Very little is known about the sensitivity of U.S. potato cultivars to PMTV-induced tuber necrosis. The current study is aimed at investigating the sensitivity of a large number of potato cultivars to PMTV-induced tuber necrosis. Sixty three cultivars representing all market-types were evaluated in North Dakota over a two year period for virus-induced tuber necrosis incidence and severity. PMTV-induced tuber necrosis (P < 0.0001) and severity (P < 0.0001) were significantly different among cultivars. Cultivars were categorized into sensitive, insensitive and moderately sensitive/insensitive groups based on the virus-tuber induced necrosis data from both years. Based on data from ND trials, six cultivars (Red Endeavor, Viking, Dakota Jewel, Dark Red Norland, Nicolet, and Modoc) were rated as sensitive and 43 were rated as insensitive to PMTV-induced tuber necrosis. Four cultivars, including Bannock Russet, Gemstar Russet, Lelah, and Waneta showed zero PMTV incidence over two years. These results will help growers in making individual or coordinated decisions for the management of PMTV-induced tuber necrosis under field and storage conditions.