Swirls are a typical symptom of MVX. Global problem
Reports of infection with MVX have been received from counties in all continents including Argentina, Israel, Iran, Australia, Canada, Italy, France, the Netherlands, Belgium, Germany, Ireland and the UK. I have been actively involved in solving the problem in many of these coun- tries. The virus occurs much more frequently than imagined. A single brown mushroom, or a
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Mushrooms develop in an irregular pattern like a cauliflower.
small bare patch, will usually go unnoticed. Growers fail to recognise the symptoms of the disease and attribute it to other causes. A con- sultant is only called on once the problem takes on a very serious nature, or other attempts at solving the issues have failed. A lot of money has usually been spent by now. I am convinced that MVX has caused serious problems on many more mushroom farms worldwide, that it has cost a great deal of money, the problem has not been identified correctly leading to the wrong decisions being made and, ultimately, it has forced growers to close their farms.
Mushroom Casing Partner
Your
How to get it, and to get rid of it Research has shown that incorporating just 0.01% of infected material into healthy compost is enough to cause an infection that exhibits the specific MVX symptoms. However, this experi- ment has not been tried using less than 0.01%. This could lead to the conclusion that infection with an even lower concentration may not result in visible symptoms, but may well be the first step towards creating a more serious infection. The virus particles occur in the mushroom mycelium and the spores. When infected threads of mycelium or spores grow, together with healthy mycelium, anastomosis (naturally occur- ring connections between infected and healthy parts), can allow virus particles to be transmitted. This can occur in spawned compost, phase III compost, but also in casing soil. The higher the concentration of infected material and the sooner in the process, the more severe the symptoms. The only way to get rid of the virus is by destro- ying the infected mushroom mycelium and spores. Cook-out is an effective measure, as is meticulous cleaning in combination with applying effective disinfectants.
Action plan in practice I have supervised many growers in tackling these problems, and to be honest, it is not always easy. One of the barriers to success
10 MUSHROOM BUSINESS
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