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acre affect AGRICULTURE aphids appear area assumed bacterial bacterium black blackleg Blight conditions brownish burlap bags Canada sampled carried cause a wilt certified seed potatoes cluding combination common considerable contain potatoes control of early crop of potatoes cutting and planting development difficult to identify diseases found DISEASES OF POTATOES disinfectant duce early blight early dying ease equipment erance exhibit fect field following found in Wyoming frost damage fungicidal sprays fungus Fusarium ground grower healthy plants Idaho increase infected plants Infected tubers late blight Leafroll leaves lesions losses lots main source million plants necrosis occurs pathogen perature plants grown potato diseases PROBLEM DISEASES produced relatively Rhizoctonia solani ringrot rotation sclerotia season serious similar Softrot soil infestation spores spread sprinkler irrigation stage of growth steam stem storage surface survive susceptible symp symptoms taminate Temperature test tions transmit tuber infection varieties vascular ring vascular system Verticillium vines virus free zero tol