Verticillium is common in many soils and affects several hundred herbaceous and woody plant species, while exhibiting definite host preferences.
Verticillium is a fungi in the division of Ascomycota. This genus is an anamorphic form of the Plectosphaerellaceae family and contains more that 50 species. It can be broadly divided into three ecologically based groups:
1.mycopathogens
2. entomopathogens
3. plant pathogens and related saprotrophs.
However, recently the genus has undergone some revision into which most entomopathogenic and mycopathogenic isolates fall into a new group called Lecanicillium. The genus now includes the plant pathogenic species V. dahliae, V. nubilium, V. albo-atrum, and V. tricorpus. These fungi live in the soil and attack plants whose roots are stressed. 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. These fungi may att
ack more than three hundred woody and herbaceous plant species. Ash, catalpa, maple and Russian olive are most likely to be infected. This disease caused by the fungi Verticillium albo-atrum can become a serious problem on susceptible hosts in infested soils, because the fungus insists in the soil on hosts that exhibit no symptoms.
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