, 27:193 | Cite as

Influence of rate of soil fertilization on alternaria leaf blight (Alternaria dauci) in carrots

  • H. Vintal
  • E. Ben-Noon
  • E. Shlevin
  • U. Yermiyahu
  • D. Shtienberg
  • A. Dinoor
Research Paper


The possibility of suppressingAlternaria dauci (Kühn) Groves & Skolko, the causal agent of Alternaria leaf blight in carrot, by excess application of fertilizer was examined in greenhouse and field experiments. Reducing the rate of fertilization by one half from the optimal rate (100 ppm N, 19 ppm P and 74 ppm K) resulted in a 23–30% increase in the severity of Alternaria leaf blight. However, doubling the rate of fertilization resulted in only a 10–15% decrease in disease severity. Inoculating with different concentrations ofA. dauci spores (103 or 104 spores/ml) did not alter the response of the plants to the fertilization rate, although significantly higher disease severity was observed in plants inoculated with the higher spore concentration. These results were corroborated in the field, where neither disease severity nor harvested yield was significantly affected by tripling the amount of soil fertilization. Application of foliar fungicides, on the other hand, had substantial effects on both disease and yield. Therefore, it was concluded that carrot crops should be fertilized and maintained for optimum yield, and thatA. dauci should be managed by properly timed applications of fungicides during the growing season.

Key Words

Alternaria leaf blight Alternariadauci fertilizer IPM 


  1. 1.
    Barclay, G.M., Murphy, H.J., Manzer, F.E. and Hutchinson, F.E. (1973) Effects of different rates of nitrogen and phosphorus on early blight in potatoes.Am. Potato J. 50:42–48.CrossRefGoogle Scholar
  2. 2.
    Goodman, R.N., Kiraly, Z. and Wood, K.R. (1986) The Biochemistry and Physiology of Plant Diseases. University of Missouri Press, Columbia, MO, USA.Google Scholar
  3. 3.
    Harrison, M.D., Livingston, C.H. and Oshima, N. (1965) Epidemiology of early blight in Colorado. Initial infection, disease development and the influences of environmental factors.Am. Potato J. 42:279–291.CrossRefGoogle Scholar
  4. 4.
    Hillcoks, R.J. and Chindoya, R. (1989) The relationship between Alternaria leaf spot and potassium deficiency causing premature defoliation of cotton.Plant Pathol. 38:502–508.CrossRefGoogle Scholar
  5. 5.
    Horstall, J.G. and Heuberger, J.K. (1942) Causes, Effects and Control of Defoliation on Tomatoes.Conn. Agric. Exp. Stn. Bull. (New Haven) 456.Google Scholar
  6. 6.
    Jones, J.B. Jr. (1997) Hydroponics. A Practical Guide for Soilless Growers. St. Lucie Press, Boca Raton, FL, USA.Google Scholar
  7. 7.
    Jones, J.B. Jr., Wolf, B. and Milles, H.A. (1991) Plant Analysis Handbook. A Practical Sampling, Preparation, Analysis, and Interpretation Guide. Micro-Macro Publ. Inc., Athens, GA, USA.Google Scholar
  8. 8.
    Langesberg, W.J., Sutton, J.C. and Gillespie, T.J. (1977) Relation of weather variables and periodicities of airborne spores ofAlternaria dauci.Phytopathology 67:879–883.CrossRefGoogle Scholar
  9. 9.
    MacKenzie, D.R. (1981) Association of potato early blight, nitrogen fertilizer rate and potato yield.Plant Dis. 65:575–577.Google Scholar
  10. 10.
    Miller, J. W. (1969) The effect of soil moisture and plant nutrition onCercospora—Alternaria leaf blight complex of cotton in Missouri.Phytopathology 59:767–769.Google Scholar
  11. 11.
    Netzer, D. and Kenneth, R.G. (1969) Persistence and transmissionof Alternaria dauci (Kühn) Groves & Skolko in the semi-arid conditions of Israel.Ann. Appl. Biol. 63:289–294.CrossRefGoogle Scholar
  12. 12.
    Rotem, J. (1981) Fungal diseases of potato and tomato in the Negev region.Plant Dis. 65:315–318.Google Scholar
  13. 13.
    Rotem, J. (1994) The GenusAlternaria. Biology, Epidemiology and Pathogenicity. American Phytopathological Society Press, St. Paul, MN, USA.Google Scholar
  14. 14.
    Shtienberg, D. and Dreishpoun, J. (1991) Suppression of Alternaria leaf spot in Pima cotton by systemic fungicides.Crop Prot. 10:381–385.CrossRefGoogle Scholar
  15. 15.
    Snell, F.D. and Snell, C.T. (1959) Calorimetric Methods of Analysis. Vol. II. 4th ed. D. Van Nostrand Company, Inc., Princeton, NJ, USA.Google Scholar
  16. 16.
    Soltanpour, P.N. and Harrison, M.D. (1974) Interrelations between nitrogen and phosphorus fertilization and early blight control of potatoes.Am. Potato J. 51:1–7.CrossRefGoogle Scholar

Copyright information

© Springer Science + Business Media B.V. 1999

Authors and Affiliations

  1. 1.Dept. of Plant PathologyARO, The Volcani CenterBet DaganIsrael
  2. 2.Dept. of Plant Pathology and MicrobiologyThe Hebrew University of Jerusalem, Faculty of AgricultureRehovotIsrael
  3. 3.ARO, Gilat Experiment StationMobile Post Negev 2Israel

Personalised recommendations