Mushroom Virus X Syndrome - Patch Disease and Brown Cap Mushroom Disease
Mushroom Virus X syndrome (MVX) describes a range of symptoms including delayed opening, reduced yields, distorted mushrooms and cap browning which express on cultivated Agaricus bisporus crops. MVX syndrome is now known to be a combination of two separate virus diseases – Patch Disease and Brown Cap Mushroom Disease – which can occur together and express a variable and complex symptomology. In some cases, one or two symptoms may predominate.
MVX syndrome first emerged in Britain in 1990 when mushroom crops began expressing symptoms resembling a virus infection. But established techniques used previously to detect the La France virus were unable to detect a virus responsible for the novel infection, leading researchers to investigate other causes.
