Verticillium is a genus of fungi in the division Ascomycota, and are an anamorphic form of the Plectosphaerellaceae family. The genus used to include diverse groups comprising saprobes and parasites of higher plants, insects, nematodes, mollusc eggs and other fungi thus it can be seen that the genus used to have a wide ranging group of taxa characterised by simple but ill-defined characters.
The genus used to include diverse groups comprising saprobes and parasites of higher plants, insects, nematodes, mollusc eggs and other fungi thus it can be seen that the genus used to have a wide ranging group of taxa characterised by simple but ill-defined characters. The genus now includes the plant pathogenic species V. dahliae, V. albo-atrum, V. nubilium, and V. tricorpus.
The genus, currently thought to contain 51 species, may be broadly divided into three ecologically based groups 1) mycopathogens 2) entomopathogens and 3) plant pathogens and related saprotrophs. Verticillium is common in many soils and affects several hundred herbaceous and woody plant species, while exhibiting definite host preferences (see table 1). However, recently the genus has undergone some revision into which most entomopathogenic and mycopathogenic isolates fall into a new group called Lecanicillium. In Minnesota, ash, catalpa, maple and Russian olive are most frequently infected. This disease can become a serious problem on susceptible hosts in infested soils, since the fungus persists in the soil indefinitely, many times on hosts that exhibit no symptoms. The genus now includes the plant pathogenic species V. dahliae, V. albo-atrum, V. nubilium, and V. tricorpus. However, V. dahliae is the species that most commonly attacks woody ornamentals in the United States.
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