TY - JOUR T1 - The Comparative Effectiveness Of Pruning Versus Pruning Plus Injection Of Trunk and/or Limb for Therapy Of Dutch Elm Disease in American Elms JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 2 LP - 4 DO - 10.48044/jauf.1979.001 VL - 5 IS - 1 AU - Garold F. Gregory AU - James R. Allison Y1 - 1979/01/01 UR - http://auf.isa-arbor.com/content/5/1/2.abstract N2 - During the 1976 season, American elm street trees infected with Dutch elm disease (DED) in Elmhurst, Illinois, and Shaker Heights, Ohio, were given one of the following treatments: (1) pruning; (2) limb injection with Lignasan BLP and pruning; (3) trunk injection with Lignasan BLP and pruning; or (4) truck and limb injections and pruning. Trees with wilt symptoms greater than 30 percent when discovered were not treated but removed as soon as possible. By the end of the 1977 season, Treatment 4 seemed the most effective, followed by Treatment 3. The lower the percent of symptoms at time of treatment, the more successful were Treatments 1 and 2. The superiority of Treatments 3 and 4 was particularly evident when symptoms at time of treatment were 10 or 15 percent. As the distance between the last visible staining by DED and the pruning cut increased, so did the percentage of therapeutic success. Limb and trunk injection with Lignasan BLP followed by pruning is another tool to be used in the battle against DED, and is most effective if used before the disease symptoms are widespread. ER -