Table 1.

Mortality and history of a Zelkova planting (102 trees) in southern Michigan, 1955-1976.

YearNo. of trees dyingCause of deathComments
1955-6523Unknown
19663Probably cankerMower injury abundant, cankers common
19674Canker
19684CankerMower injury rare
196916Mouse injury cankerMany trees severely injured by mice during winter
19701CankerMower injury rare Few active cankers
19711Canker
19725Ice damage, CankerSevere ice storm March caused extensive injury
19732Canker, decay following mouse injury
19741Canker
19751Canker