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Botrytis in Polytunnel

I have had a problem with botrytis on my tomatoes in a polytunnel this year. They had plenty of ventilation but I assume the cause is climatic (a combination of humidity and low light levels). I have grown tomatoes for 30 years and have never encountered this before. My question is: Can I spray the tunnel extensively inside (including the soil) with Jeyes Fluid to prevent the spores overwintering? If so, how soon can I replant the beds. Or, is there a better, less severe, product that would do the job? MikeG, Galway, Co Galway Posted: 05/09/2016

Disinfecting will not help because the spores are everywhere and wind-borne.

Yes, it is increased by humid weather and watering needs to be reduced and more directed to the rootball.

It is much worse in a tunnel as they are not as well ventilated. 

 

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