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healthy tree. “The spread of the fungus by this means can be prevented by killing segments of possible root graft unions with Vapam, or UPM (32.7 per cent sodium methyldithiocarbamate). The chemical should be applied as soon as the first symptoms are observed," Stipes instructed.
Both scientists recommended t he use of disease resistant species i" new plantings where for some reason, disease control measures are not observed. The Buisman elm, the Groeneveld elm, the Chinese elm and the Siberian elm are resistant species suggested for planting in Virginia.
Annual expenses of a Dutch elm disease control program might prove substantially less than the
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