Abstract
Eighty-one clones of Siberian elm (Ulmus pumila) were screened for resistance to Sphaeropsis ulmicola (=Borryodiplodia hypadermia) to determine if different levels of disease reaction or canker development could be detected. In 1989, inoculations with S. ulmicola resulted in significant differences among clones for branch dieback and canker length. In 1990, three clones with some resistance (small cankers) and three susceptible clones (large cankers) were inoculated with six isolates of S. ulmicola. On the basis of branch dieback and canker length, these clones were significantly different and responded similarly to inoculations performed in 1989. No significant differences in canker development among the six isolates were detected, and the isolate X clone interactions were not significant
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