What is Verticillium

Verticillium is a genus of fungi in the division Ascomycota, and are an anamorphic form of the Plectosphaerellaceae family. Verticillium wilt may cause wilting of all or only parts of plants (Figure 1). There is no chemical control for the disease but crop rotation, the use of resistant varieties and deep plowing, may be useful in reducing the spread and impact of the disease. The symptoms are similar to most wilts with a few specifics to Verticillium. Wilt itself is the most common symptom, with wilting of the stem and leaves occurring due to the blockage of the xylem vascular tissues and therefore reduced water and nutrient flow.
Verticillium wilt occurs in a broad range of hosts but has similar devastating effects on many of these plants. In general, it reduces the quality and quantity of a crop by causing discoloration in tissues, stunting, and premature defoliation and death. 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, currently thought to contain 51 species, may be broadly divided into three ecologically based groups mycopathogens entomopathogens and 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. albo-atrum, V. nubilium, and V. tricorpus.

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