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30 gallons acid appear bacterial barrel beneﬁcial blackleg blue vitriol bordeaux mixture caused certiﬁed seed color control measure copper sulfate corrosive sublimate crop rotation curly dwarf cut seed degenerative diseases diseased plants diseased seed pieces disinfect early blight Experiment Station favorable ﬁrst ﬂesh foliage fresh mixed 20-80 frost injury fungicide fungus Fusarium wilt gallons of water Giant hill green grown healthy plants healthy tubers hopperburn hydrated lime infected late blight leafhopper leaﬂets leafroll plants lesions loss mixture mosaic nozzles occur Ohio seed parasite potato crop potato plant pounds of blue practically free prevent produced in Ohio rhizoctonia rogued safe seed scab organism seed potatoes seed selection seed treatment seed tubers soil spindle sprout spindle tuber spores sprayer spraying or dusting spread stock solution stolons storage sulfur surface symptoms temperature thoro thru thruout Tipburn treating solution usually virus yellow dwarf yield