American Potato Journal

, Volume 65, Issue 8, pp 439–447 | Cite as

Seasonal variation and effects of wheat rotation on populations ofVerticillium dahliae Kleb. in Ohio potato field soils

  • T. R. Joaquim
  • V. L. Smith
  • R. C. Rowe


Soil population levels ofVerticillium dahliae in Ohio were monitored from May–October, 1982–1985, in 15 fields in potato-wheat rotation and two fields in potato monoculture. Population levels in fields in rotation ranged from 0 to 86 microsclerotia/10 g of air-dried soil with average values during each 6-month sampling period of 9.7, 12.9, 9.6 and 19.6 microsclerotia/10 g of soil for 1982, 1983, 1984 and 1985, respectively. In at least 2/3 of the fields sampled each year, soil populations ofV. dahliae peaked in either July or August, regardless of whether fields were under wheat rotation or potato monoculture. Of the 15 fields under potato-wheat rotation, 13 showed a general pattern of increased populations ofV. dahliae in one or both years following cropping to potato. Among those 13, significantly higher populations (P < 0.05) were observed in one wheat field in 1983 and in eight fields in 1985. In the two fields in potato monoculture, one consistently had population levels ofV. dahliae 3–4 times higher than any other field sampled in this study. Factors that may contribute to periodic changes inV. dahliae populations, implications of these changes in interpreting soil population data, and usefulness of a potato-wheat rotation in managingV. dahliae populations in Ohio are discussed.

Additional Key Words

Solanum tuberosum crop rotation 


De mayo a octubre de 1982 a 1985 se hizo un seguimiento de los niveles de población deVerticillium dahliae en el suelo en 15 campos con rotación papa-trigo y 2 campos de monocultivo de papa. Los niveles de población en los campos con rotación arrojaron un rango de 0 a 86 microesclerocios/10 g de suelo secado al aire, con valores promedio de 9,7, 12,9, 9,6 y 19,6 para 1982, 1983, 1984 y 1985 respectivamente, durante cada período de muestreo de 6 meses. Por lo menos en 2/3 de los campos muestreados cada año, la población deV. dahliae alcanzó su mayor incremento ya sea en julio o en agosto, prescindiendo del hecho de rotación o de monocultivo. De los 15 campos bajo sistema de rotación papa-trigo, 13 mostraron un patrón general de incremento de la población deV. dahliae en uno o en ambos años que siguieron al cultivo de papa. Entre estos 13 campos se observó una población significativamente alta (P < 0,05) en un campo de trigo en 1983 y en 8 campos en 1985. En los 2 campos de monocultivo de papa, uno tenía consistentemente niveles de población deV. dahliae 3 a 4 veces mayores que cualquier otro campo muestreado en este estudio. Se discuten los factores que pueden contribuir en los cambios periódicos de las poblaciones deV. dahliae, las implicancias de estos cambios en la interpretaciíon de los datos de población en el suelo y la utilidad de una rotación papa-trigo en el manejo de las poblaciones deV. dahliae en Ohio.


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Copyright information

© Springer 1988

Authors and Affiliations

  • T. R. Joaquim
    • 1
  • V. L. Smith
    • 1
  • R. C. Rowe
    • 1
  1. 1.Department of Plant PathologyThe Ohio State University, Ohio Agricultural Research and Development CenterWooster

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