MUSHROOM Look before you leap! BUSINESS
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There are a great many misconceptions about the working of ozone in mush- room growing. Ozone can be used to disinfect contaminated air, a process that apparently seems successful on many farms – but beware! I recently visited a farm where they had no idea about the working of ozone, and the owner had evidently been unable to resist the sales patter of the rep selling the ozone unit. As ‘a trial’ an ozone generator was installed in the return air duct in a growing room where the first flush was starting to emerge. The intention was to destroy trichoderma spores with the ozone. The effect was dramatic, as after running for one night all the mushrooms had turned pale brown, including all the pinheads too, and to a lesser extent scaling was vis- ible. Moreover, growth stagnated drastically, with a huge drop in production and delayed further growth. The trichoderma was hardly affected at all by the ozone treatment.
Trichoderma infections can be caused by poor hygiene in tunnel companies, but also when filling phase II and/or phase III compost it is vital to work very hygienically. Sometimes, in cases where tunnels are poorly constructed, water or contaminated air from outside can enter the tunnel during the phase II process, or it may be that the pasteurisation temperature is not reached at all points in the tunnel. In some countries, this is the result of false economies. A lack of expertise in the specifics of building tunnels can have wide-reaching, negative effects. During an incorrect phase II treat- ment trichoderma spores are often not destroyed adequately. The optimal moment to destroy spores of trichoderma and other weed moulds is during pasteurisation, whereby it is the combination of ammonia and the pasteur- isation temperature that mainly play an important role in destroying the moulds. This explains the importance of creating the right conditions for an optimal phase II and phase III process as many things can go wrong during inoculation. So pay attention to absolute cleanliness during filling activities. Don’t try to make false economies when constructing a tunnel company. And don’t even bother with an ozone generator.
By Jos Buth, Mushroom Advice Network
josbuth@gmail.com
50 MUSHROOM BUSINESS
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