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Verticillium wilt of the hop: the survival of V. albo‐atrum in soil
Author(s) -
SEWELL G. W. F.,
WILSON J. F.
Publication year - 1966
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1966.tb04383.x
Subject(s) - biology , infectivity , verticillium , verticillium wilt , weed , agronomy , fungus , horticulture , outbreak , botany , virus , virology
SUMMARY Verticillium albo‐atrum was apparently eradicated from soil in which dicotyledonous plants were suppressed. In one field experiment V. albo‐atrum was not recovered after 4 years of weed‐free grass cover; in the same period soil infectivity reduced to very low levels under two bare fallow treatments. Where weeds developed after single annual cultivations soil infectivity declined from the initially high level but finally increased. In three observation trials in which hop plants were used to detect V. albo‐atrum after grass‐cover treatments, soil infectivity was very low after 2 years and apparently nil after 3–5 years. Grass cover effectively stabilizes infested soil; it may be used for limiting spread from primary disease outbreaks, and also as a short‐term treatment to reduce the infectivity of soil to be re‐planted with resistant varieties. The frequent incidence of V. dahliae hop infections in one trial indicated that this fungus was not amenable to control by grass cover treatment and hence may be ecologically distinct from V. albo‐atrum.