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Home → Publications → American Chestnut Proceedings → 1982 → The Ability of Hypovirulent Isolates and Mixtures of Hypovirulent Isolates to Control Artificially Established Virulent Cankers

The Ability of Hypovirulent Isolates and Mixtures of Hypovirulent Isolates to Control Artificially Established Virulent Cankers

ABSTRACT.--The ability of hypovirulent (H) isolates of Endothia parasitica to alter the normal morphology of virulent (V) isolates was determined by individually pairing six H isolates and four H mixtures with V isolates from eight vegetative compatibility groups on agar media. The H isolates and H mixtures were scored as either compatible with a V isolate if morphological changes occurred, or incompatible if there was no change. The same V-H combinations (compatible and incompatible) were tested on American chest-nut trees to determine whether the in vitro ability of an H isolate or H mixture to alter the morphology of a V isolate was similar to the in vivo ability to control canker expansion. With one exception, V isolates that were compatible in vitro with an H isolate or H mixture were always controlled in vivo. In all cases, H isolates and H mixtures controlled more V isolates in vivo than they morphologically altered in vitro.


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Author(s): Mark L. Double

Publication: American Chestnut Proceedings - 1982