Looking for biological remedy against botrytis

[svalli]

Last year I lost many tomatoes in my greenhouse to botrytis. I have been looking for non chemical remedy for this year.
So far I have found two products:
Prestop, which is used by commercial growers and is based on beneficial soil fungus.
Biocin, which is quite new herbal extract.

I'm sure Prestop will work, but it is difficult for me to buy, since it is normally sold only to commercial greenhouses.
The Biocin sounds like some of the other magical potions with more marketing than actual results. Since it is relatively new product no one may have tried it yet. If I find it in any of the garden centers here, I may have to try it with few plants.

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