I've been spraying my potatoes with the bluestone mixture (copper sulphate & washing soda) but have noticed that the leaves near to the root of the plants are turning yellowish with brown scabs...is this blight? If so, is there anything further I should be doing?
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I want to spray for Potato blight but would like to use the bluestone & washing soda remedy. How effective is this in comparison to newer remedies such as Ditane and do you know what the proportions of each (bluestone & washing soda)should be used?Many thanks
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