[fekq]

I have about 8 bags of compost in the greenhouse that I used to grow tomatoes in this summer.

The toms eventually succumbed to blight (at end of season)

I usually empty the used compost over the flowerbeds when I've cleared those, but this year am thinking of using the ex-tomato compost to grow salad, herbs etc over winter under glass

However: if I do this, I'll be keeping the blight spores in the greenhouse, and all my cleaning and sulphur candle burning that I'm planning this weekend will go to waste --- will it not? I will be growing toms (in new compost) in the greenhouse next year, so don't want to start the season with blight already there.

I wondered whether pouring a kettle of boiling water over the top layer of compost in each bag would kill the blight off? Or if I left the bags of compost in the greenhouse when the sulphur candle's burning would that do the trick?

your thoughts / experience please!

[JayG]

I can't really give any other answer than the one I gave in a previous discussion about re-using compost (it's the same fungus that blights potatoes and tomatoes.)

http://chat.allotment-garden.org/index.php?topic=110593.msg1249388#msg1249388

Could you not leave the scrub down and sulphur candle until the spring so you can still grow your winter salads, starting off the main growing season next year with a newly-prepared GH and fresh compost - I think you'd sleep better at night next summer if you did! 

[moose]

I've always been told that blight spores only survive on living plants not in the soil or compost.

[mumofstig]

Research is ongoing.
In the thread, linked to above, there's a quote from the RHS 

The fungus can also produce resting spores (oospores) in the plant tissues that can contaminate the soil. Little is known about their survival and their potential as a source of the disease. The investigations into oospores are continuing and more information may be available in a few years.

[Headgardener22]

The only experience that I can add is that I didn't think that blight survived in the soil. I grow tomatoes in the border of the greenhouse. I had late blight in 2010 but its not reappeared in subsequent years.

I did make sure to get rid of any infected plant material at the time but haven't done anything else special.