Abstract
Viable propagules ofVerticillium albo-atrum were recovered from roots and stems of naturally infected weeds and sunflower cultivars before or after burial in the field and from stems and roots of certain non-infested crops after burial in the field for seven months.Verticillium dahliae was recovered less frequently, then only from the roots ofSolanum nigrum (black nightshade).
Survival of these pathogens after burial for 7 months varied considerably, ranging from 38 to 58% in sunflower stems and from 19 to 235% in roots of weeds.
In stems of weeds and crops which did not contain propagules ofV. albo-atrum before burial, the fungus was recovered consistently after burial, indicating that saphophytic colonization probably occurred during interment.
Resumen
Se recobraron propágulos viables deVerticillium albo-atrum de raíces y tallos, de malezas y cultivares de girasol antes y después de estar enterrados en el suelo, y de tallos y raíces de ciertos cultivos no infectados después de permanecer enterrados por un período de 7 meses.V. dahliae se recobró con menor frecuencia y solamente de raíces deSolarium nigrum.
La sobrevivencia de estos patógenos después de estar enterrados en el suelo por 7 mese mostró una variación considerable con valores que oscilaron del 38 al 58% en tallos de girasol y del 19 al 235% en raíces de malezas.
V. albo-atrum fue frecuentemente obtenido de tallos de malezas y cultivos que habían estado enterrados por un tiempo en el suelo, los cuales no contenian propágulos en al momento de ser enterrados. Esto indica que durante el período que permanecieron bajoierra, existió colonización saprofítica de los mismos.
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Project financed in part by the Minnesota Potato Certification Agency.
Paper No. 11,670, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul, MN 55108.
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Slattery, R.J. Inoculum potential of Verticillium species in crop and weed residues overwintering in infested soil. American Potato Journal 60, 47–53 (1983). https://doi.org/10.1007/BF02853547
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DOI: https://doi.org/10.1007/BF02853547