Jay we can use any organic copper spray but frankly I don't think it is much use once it arrives..it isn't in my compound area yet though and my tomatoes never get any moisture on their leaves at all so it is a waiting game. I think Toms potaties are at more risk, they are closer to the main gardens. I checked them today and they are fine but they are so far behind.I am hoping I can get at least some healthy small tubers which I shall hopefully overwinter for next year, well you know the other bit!! If I do get it on them I will bin the lot, spuds and all as I wouldn't want to risk carrying it on.
Trouble is there are many folks here who still plant supermarket spuds which is scary, but it happens a lot and I know the local garden centre who sells plants sold some blight infected plants that made it to our gardens last year, we get a lot of new gardeners who don't realise the risks
XX Jeannine