Abstract
Swart, W. J.. Conradie, E., Wingfield, M. J., and Venter, W. B. 1992. Effects of water stress on the development of cambial lesions caused by Cryphonectria cubensis on EucalyptUsgrandis. Plant Dis. 76:744.746. The restriction of Cryphonectria cubensis to high-rainfall areas in South Africa has led to speculation regarding the influence of soil moisture on disease severity. A study was, therefore. conducted to determine whether a relationship exists between the development of Cryphonectria canker and water stress. Techniques involving axenic culture of the pathogen and artificial inoculation of l-yr-old potted Eucalyptus grandis plants were employed. In culture, a significant negati..'e correlation (r = 0.993; P < 0.01) was found between the growth of C. cubensis and osmotic stress induced by KCI. Pressure bomb assessment of the water potentials of inoculated plants indicated that drought.stressed plants (-2.5 MPa) developed smaller cambial lesions than nonstressed plants (-1.0 MPa). These results are in contrast with numerous reports on other canker pathogens in which drought stress is associated with increased growth of the pathogen.
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