I have a polytunnel, and have just discovered that my early potatoes look like they have been hit by what looks like blight - there are also some spots on my tomato plants - is this possible in early may - how do i get rid of it - can I plant new tomato plants in the tunnel - if so - do I need to just grow bags - will I have to change the soil in the borders for next year. I have now sprayed with dithane and cut off the bad foliage off the tubers - potatoes are the size of golf balls and marbles !! - can you please advise?
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