1Soil Science Research Department, Fars Research and Education Center for Agriculture and Natural Resources, Eghlid Research Station, Iran.
2Plant Protection Research Department, Fars Research and Education Center for Agriculture and Natural Resources, Zarghan, Iran.
Field experiment was conducted in 2010 and 2011, in order to study the effects of NPK fertilizers on the incidence of Verticillium wilt of a commercial variety 'Agria' in deficient soil at Eghlid Agriculture Research Station in the north of Fars province, Iran. Experimental design was randomized complete blocks and each treatment replicated three times. Treatments were the amounts of recommended NPK rate (180N, 125P, 100K), 20% and 40 % less and more than the rate based on the soil tests. Soil at planting sites was inoculated with 5 ml of microsclerotia suspension (70 ms/ml). Tubers weight, plant height and disease scores were recorded. Two-year combined analysis indicated that there were significant differences at 1% level between the treatments. The results showed a marked decrease in Verticillium wilt incidence and increase in yield when NPK was used at the recommended rate. Lowest disease score and highest yield even more than the cultivar potential were obtained in the plots when N was used 40 % more than the recommended level of the soil test (252 N), combined with K at the level of the soil test (100 K). P was essential for plant growth but had no effect on the disease.
Datnoff, L. E., Elmer, W. H. and Huber, D. M. 2007. Mineral Nutrition and Plant Disease. APS Press, St. Paul, Minnesota, 278 pp.
Davis, J. R. and Everson, D. O. 1986. Relation of Verticillium dahliae in soil and potato tissue, irrigation methods and N-fertility to Verticillium wilt of potato. Phytopathology, 76: 730-736.
Davis, J. R., Stark, J. C., Sorensen, L. H. and Schneider, A. T. 1994. Interactive effects of nitrogen and phosphorus on Verticillium wilt of Russet Burbank potato. American Potato Journal, 71: 467-481.
Huber, D. M. and Watson, R. D. 1974. Nitrogen form and plant disease. Annual Review of Phytopathology, 12: 139-165.
Isaac, I. and Harrison, J. A. C. 1968. The symptoms and casual agents of early-dying disease (Verticillium wilt) of potatoes. Annals Applied Biology, 61: 231-244.
Kirk, W. W. and Wharton, P. S. 2014. Fungal and bacterial disease aspects of potato production. In: Navarre, R. and Pavek, M. (Eds.), The Potato, Botany, Production and Uses. Chapter 11CABI, Boston, MA., pp: 167-201.
Malakouti, M. J. and Ghibi, M. B. 1987. Determination of critical soil tests level for correct recommendation of fertilizers in Iran. Soil and Water Research Institute. Tehran, Iran, 56 pp.
Mansoori, B. 1995. The early dying disease (Verticillium wilt) of potato in Fars province. Applied Entomology and Phytopathology, 62: 42 (Short report).
Mansoori, B. 2004. Reaction of some potato cultivars to early dying disease (Verticillium dahliae) in Fars province. Seed and Plant, 19: 543-546.
Molina, D. I., Tenuta, M., Hadrami, A. E., Buckley, K., Cavers, C. and Daayf, F. 2014. Potato early dying and yield responses to compost, green manures, seed meal and chemical treatments. American Journal of Potato Research, 91: 414-428.
Nachmias, A., Caligari, P. D. S. and Brown, J. 1990. Measurement of field resistance of potatoes to Verticillium wilt (Verticillium dahliae). Potato Research, 33 (2): 201-209.
Pennypacker, B. W. 1996. The roles of mineral nutrition in the control of Verticillium wilt. In: Engelhard A. W. (Ed.). Soil-borne Plant Diseases: Management of Diseases with Macro-and Microelements. American Phytopathological Society, St. Paul, Minnesota, pp: 33-45.
Platt, H. W. and Arsenault, W. J. 2001. Management of nitrogen and phosphorus does not suppress Verticillium wilt in Yukon Gold. American Journal of Potato Research, 78: 215-219.
Rowe, R. C, and Powelson, M. L. 2002. Potato early dying: management challenges in a changing production environment. Plant Disease,86: 1184-1193.
Schnathorst, W. C. 1981. Life cycle and epidemiology of Verticillium. In: Fungal Wilt Diseases of Plants. In: Mace, M. E., Bell, A. A., and Beckman, C. H. (Eds). NY: APS Press, St. Paul, Minnesota, pp. 81-111.
Stevenson, W. R., Loria, R. and Franc, G. D. 2002. Compendium of Potato Diseases. 2nd Edition. APS Press, St. Paul, Minnesota, 106 pp.
Taylor, R. J., Pasche, J. S. and Gudmestad, N. C. 2005. Influence of tillage and method of metam sodium application on distribution and survival of Verticilliumdahliae in the soil and the development of potato early dying disease. American Journal of Potato Research,82: 451-461.
Xiao, L., Yan, H. P. and Ji-Yun, J. 2006. Advances in effect of potassium nutrition on plant disease resistance and its mechanism. Journal of Plant Nutrition and Fertilization, 12 (3): 445-450.