MUSHROOM Avoid piercing the big bags! BUSINESS
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Things often go wrong on companies that import casing soil. The big bag on the photo has been unloaded from the container by piercing it with the forks on the forklift. The easiest but not most hygienic way of unloading. The best way to unload in my opinion is to tie a rope to the loops at the top of the big bags per layer (one by one of course) and gently ‘drop’ the bags in the container. With some practice the operator can then pull the bag upright and remove it from the container by the loops. Piercing the bags with the forks can have serious consequences, as the forks are not always clean enough and the holes can be a port of entry for infections during storage. In this way spores of trichoderma or other diseases can be present in the casing soil before it is used. It is also advisable to use the same ‘clean’ forklift in the casing soil and growing zones of a farm, and use a different one where mushrooms are being harvested. Keep the area used to store casing soil as clean as possible and inspect the casing soil hall or storage for the presence of pathogens daily or weekly. The agar plates you can usually order from spawn suppliers are an ideal way to measure the disease pressure. In extremely hygienic conditions, lightly rub a cotton swab against a certain product, machine or part of a building then gently press the swab onto the agar. Remove the swab and close the lid immediately. Leave the plate to incubate at room temperature and after about five days you should be able to see whether the casing soil or other material is infected or not. If you notice patches of trichoderma in your mushrooms, iden- tify whether the infection is rife in the compost or whether it is only visible in the casing soil layer and maybe the surface of the compost. In the latter case, it is possible that the trichoderma was introduced along with the casing soil.
By Jos Buth, Mushroom Advice Network
josbuth@gmail.com
42 MUSHROOM BUSINESS
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