Abstract
Thiabendazole insensitive strains ofHelminthosporium solani, the causal agent of silver scurf, make controlling the disease with seed treatment difficult. Potato tuber seed treatments and environmental storage management practices were investigated as means to minimize silver scurf. Fungicide seed treatments were evaluated for control ofH. solani; disease was evaluated during the growing season, at harvest, and after 5 months of storage. Silver scurf was observed on progeny tubers eleven weeks after planting. Fungicides that reduced silver scurf incidence and severity on the seed resulted in reduced incidence and severity of the disease in the progeny tubers at harvest and significantly lower disease ratings after storage. Only small increases in disease incidence (0-8%) were seen after storage. Thiophanate-methyl with mancozeb, Captan with mancozeb, and fludioxonil were among the most effective in reducing the incidence and severity of silver scurf on seed and in progeny tubers (Incidence on progeny tubers at harvest for these three treatments were 3%, 9%, and 8% respectively). Thiophanatemethyl alone was not effective for control of silver scurf (48% incidence compared to 43% incidence for the untreated control).
Environmental conditions in storage affected disease development. Reduced humidity (85%) during the curing period (0–3 weeks after harvest) significantly reduced (11%) the surface area of tubers infected with silver scurf. Free moisture on the tuber surfaces during storage significantly increased (15%) tuber surface area infection.H. solani was shown to survive in soil and on some potato storage building materials for up to 9 months. The silver scurf disease of potatoes can be suppressed using effective seed treatment and storage management.
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Literature Cited
Adams, M.J. and G.A. Hide. 1980. Relationships between disease levels on seed tubers, on crops during growth and in stored potatoes. Potato Res 23:291–302.
Burke, O.D., 1937. The silver scurf disease of potato. Comell University Agricultural Experiment Station. 30 pp.
Cayley, G.R., G.A. Hide, ICA. Lord, D.J. Austin, and A.R. Davies. 1979. Control of potato storage diseases with formulations of thiabendazole. Potato Res 22:177–190.
Heiny, D.K. and G.A. McIntyre. 1983.Helminthosporium solani Dur. & Mont. development on potato periderm. Am Potato J 60:773–789.
Hellevang, K.J. 1995. Good management in early storage helps ensure quality potatoes. Valley Potato Grower. 60(114):22–23.
Hide, G.A. 1994. Effects of wounding fungicide-treated potato seed tubers on silver scurf disease on daughter tubers at harvest. Potato Res 37:287–290.
Hide, G.A. and M.J. Adams. 1980. Relationships between disease levels on seed tubers, on crops during growth and in stored potatoes. Potato Res 23:229–240.
Hide, G.A. and K.J. Booter. 1991. Effects of drying potatoes (Solanum tuberosum L.) after harvest on the incidence of disease after storage. Potato Res 34:133–137.
Hide, G.A., K.J. Boorer, and S.M. Hall. 1994a. Controlling potato tuber blemish disease on cv. Estima with chemical and nonchemical methods. Ann Appl Biol 124:253–265.
Hide, G.A. and S.M. Hall. 1993. Development of resistance to thiabendazole inHelminthosporium solani (silver scurf) as a result of potato seed tuber treatment. Plant Patho 142:707–714.
Hunger, R.M. and G.A. McIntyre. 1979. Occurrence, development, and losses associated with silver scurf and black dot on Colorado potatoes. Am Potato J 56:289–306.
Jellis, G.J. and G.S. Taylor. 1977a. The development of silver scurf (Helminthosporium solani) disease of potato. Ann Appl Biol 86:19–28.
Jellis, G.J. and G.S. Taylor. 1977b. Control of silver scurf (Helminthosporium solani) disease of potato with benomyl and thiabendazole. Ann Appl Bio 186:59–67.
Lund, R.E., J.S. Cherry, and J.M. Martin. 1991. Choosing the best by ranking and selection. Agron J 83:637–643.
Mérida, C.L. and R. Loria. 1990. First report of resistance ofHelminthosporium solani to thiabendazole in the United States. (Abstr.) Phytopatho 180:1027.
Mérida, C.L. and R. Loris. 1994a. Comparison of thiabendazole-sensitive and -resistantHelminthosporium solani isolates from New York. Plant Dis 78:187–192.
Mérida, C.L. and R. Loria. 1994b. Survival ofHelminthosporium solani in soil and in vitro colonization of senescent plant tissue. Am Potato J 71:591–589.
Read, P.J. and G.A. Hide. 1984. Effects of silver scurf (Helminthosporium solani) on seed potatoes. Potato Res 27:145–154.
Rodriguez, D., G.A. Secor, N.C. Gudmestad, and L.J. Francl. 1993. Production and dispersal ofHelminthosporium solani conidia in storage. (Abstr.) Am Potato J 70:836–837.
Rodriguez, D., G.A. Secor, N.C. Gudmestad, and L.J. Francl. 1996. Sporulation ofHelminthosporium solani and infection of potato tubers in seed and commercial storages. Plant Diesease 80:1063–1070.
Rodriguez, D., G.A. Secor, N.C. Gudmestad, and K. Grafton. 1995. Screening tuber-bearing solanum species for resistance toHelminthosporium solani. Am Potato J 72:669–679.
SAS Institute Inc. 1990. SAS/STAT Users Guide. 6. SAS Institute. Cary, NC.
Shetty, K.K. and P. Patterson 1993. Silver scurf economic assessment survey. University of Idaho. Department of Agricultural Economics. Moscow, ID. AER 93-9.
Tuite, J. 1969. Plant Pathological Methods Fungi and Bacteria. Burgess Publishing Company. Minneapolis, MN. pp239.
University of Idaho Cooperative Extension System. 1993.Idaho Potato Handbook. University of Idaho, Moscow, ID, 544.
Wilcockson, S.J., E.J. Allen, R.K. Scott, and D.C.E. Wurr, 1985. Effects of crop husbandry and growing conditions on storage losses of Pentland Crown potatoes. J Agric Sci 105:413–435.
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Approved for publication by the Director of the Idaho Agric. Experiment Station paper No. 98705.
This study was conducted with funding support from the Idaho Potato Commission.
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Frazier, M.J., Shetty, K.K., Kleinkopf, G.E. et al. Management of silver scurf (Helminthosporium solani) with fungicide seed treatments and storage practices. Am. J. Pot Res 75, 129–135 (1998). https://doi.org/10.1007/BF02895847
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DOI: https://doi.org/10.1007/BF02895847