Effects of Ash Flower Induced by Eriophyes fraxiniflora on Tree Vitality

Abstract

The effect of ash flower gall (AFG) on green ash (Fraxinus pennsylvanica) vitality was assessed using root starch, diameter at breast height (dbh) and shigometry techniques. A chi-square analysis for root starch content versus gall density, indicated that root starch storage is independent of tree gall numbers. Percent change in dbh for the growing season was not affected by gall density (P=.261). In addition, percent change in electrical resistance and average electrical resistance over the growing season, were found to be independent of tree gall density (P=.O54, P=.8O7, respectively) in multiple regression analyses. Assuming the methods used are reliable vitality indicators, AFG has no significant affect on these parameters of tree health. These results can be used in public education programs to better inform persons about AFG which may reduce the demand for control measures for this problem.