Honeylocust Canker in Kansas Caused byThyronectria austro-americana

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Abstract
A survey of honey locust (G. triacanthos) revealed that T. austro-americana commonly and abundantly fruited on dead honey locust wood, including wood within active cankers. Perithecia were more common than pycnidia. Two disease patterns were observed: trunk cankers and tree death associated with pruning wounds, sunburn damage, and insect borers in newly established windbreaks and open landscape sites; and cankers on shaded-out branches in well-established windbreaks and native tree stands. Branch cankers rarely killed trees, because the pathogen apparently did not spread from a cankered branch to the main trunk. Pathogenicity was confirmed by inoculating stems of seedlings with budded spores, conidia and pycnidiospores of cultured isolates.

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