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(Original Caption) John C. Dunegan, principal plant pathologist, U.S. Department of Agriculture, is shown at left comparing healthy and diseased branches from pear trees in a California orchard. The branch on the right is a victim of fire blight, the bacterial plague that caused an annual fruit loss of som $70,000,000. Scientist Dunegan this week told the convention of phyto-pathological society at Estes Park that the wonder drugs, streptomycin and terramycin, the wonder drugs that have saved millions of human lives, now control fire blight. Dunegan's experiments, first of their kind on such a big scale, were made on 600 bartlett pear trees in a 400 acre section of orchards at Marysville.