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CULTIVATIONTIPS ADVISIE Cobweb disease: caution!


Cobweb disease (dactylium dendroides) is a parasitic mould infection that can spread on mushroom farms incredibly quickly. The disease manifests in an early stage as patches of greyish-white fl oury powder on the casing soil surface. When the fruit bodies of the mushrooms are aff ected, the typical cobweb threads appear which give the disease its name. Infected mushrooms turn yellowy-brown and if the mycelium threads develop for a number of days, a pink colouration will appear. The disease is spread by spores and fragments of mycelium.


By Jos Hilkens


AdVisie ‘the mushroom growing consultants’, Herkenbosch hilkens@mushroomconsulting.nl


Photos: AdVisie


Controlling cobweb starts by identifying the patches in time, followed by a daily treatment. However, this course of action is often neglected on many farms. The patches are left untreated for days and before you know the problem has been spread by spores, fl ies, sciarids and pickers etc.. Once an infection has been identifi ed in a growing room, the best option is to inspect the beds daily and treat new patches before harvesting starts. But a shortage of staff , lack of time before harvesting and costs often mean the best option is left out. An alter- native is to tell pickers to mark infected spots during picking and at the end of the day instruct one or two people to treat these spots by isolating them with e.g. salt or paper, eventually followed by a treatment with a disinfectant. Alongside the right treatment of infected patches to prevent further spread, a series of hygiene and cultivation measures are usually needed to completely eradicate the problem. Contact us for advice about solving any problems faster.


Overdue maintenance?


Machinery and installations on a composting plant have a hard time coping with the aggressive climate conditions. With their tight schedules, composters simply can’t aff ord idle time caused by machine malfunctions during work activities; so many companies perform preventive maintenance. A good service technician knows the installations, and can tell by listening to the noises and looking at the materials which parts have to be replaced before they start to cause problems.


By Con Hermans


AdVisie ‘the mushroom growing consultants’, Heythuysen hermans@mushroomconsulting.nl


However, some machinery parts on tunnel plants are out of view of the service technician as they are only visible if the tunnel door is open. And they do not directly trigger technical malfunctions that draw attention. One of these parts is the drainage hose of the condensate tank. During the tunnel process this hose is responsible for draining away hundreds of litres of condensate. If the hose ruptures, this water will fl ow directly into the underlying compost and will result in a huge wet patch comprising a few tons of compost. If this happens in a pasterisation tunnel, it will be diffi cult to make this patch of compost ammonia-free -leading to problems with incubation later. If this kind of wet patch occurs in the incubation tunnel, the result is often large patches of mummy disease at the mushroom farm. So these types of parts should also be replaced on time before they can negatively aff ect compost quality. The best way to handle this is to make a checklist that tunnel workers can run through during their regular activities.


(advertentie) Consulting for: the mushroom growing consultants


Jos Hilkens +31(0)653 31 6204


Composting 6 MUSHROOM BUSINESS


Disease control


Mushroom picking


Con Hermans +31(0)653 29 9396


www.mushroomconsulting.nl


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