Effects of hypovirulence in Cryphonectria parasitica and of secondary blight infections on dieback of American Chestnut trees. Kuhlman, E. G. Phytopathology, 1983.
Effects of hypovirulence in Cryphonectria parasitica and of secondary blight infections on dieback of American Chestnut trees. [pdf]Paper  abstract   bibtex   
Compatible hypovirulent (H) isolates of Cryphonectria parasitica applied to either wounded or nonwounded chestnut blight cankers reduced dieback of American chestnut trees 27-51 mo after inoculation in comparison to dieback of wounded or nonwounded controls. Most control trees were killed back to the point of inoculation with virulent (V) isolates within 15-19 mo after inoculation. Initially, H treatments of wounded cankers promoted healing at the inoculation point, but subsequently the treatments sometimes failed to stop girdling by naturally developing basal cankers or secondary infections at the inoculation point.

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