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Black-Butt Disease of Black Wattle Caused by Phytophthora nicotianae var. parasitica. F. C. J. Zeijlemaker, Plant Pathologist and Plant Physiologist, Wattle Research Institute, University of Natal, Pietermaritzburg, Natal, South Africa; Phytopathology 61:144-145. Accepted for publication 20 August 1970. DOI: 10.1094/Phyto-61-144.

Inoculation experiments show that the black-butt disease of Black Wattle (Acacia mearnsii), cultivated for the high-quality tannins in its bark, appears to be caused by Phytophthora nicotianae var. parasitica. Two syndromes of the disease can be distinguished. The first takes the form of spreading mottled lesions, possibly related to infection by zoospores, and the second of tongues of diseased bark, originating from the penetration of mycelium.