Author： Roberts Bruce R.
Publisher： Society of American Foresters
ISSN： 0015-749X
Source： Forest Science, Vol.12, Iss.1, 1966-03, pp. : 44-47
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Abstract
Two-year-old seedlings of Ulmus americana L. (susceptible) and Ulmus pumila L. (resistant), growing in plastic containers in the greenhouse, were artificially inoculated with spores of Ceratocystis ulmi Daily measurements of transpiration were recorded as the disease progressed over a period of 8 weeks. Transpiration lessened in both susceptible and resistant species 2 weeks after inoculation. This decline continued for 1 month, at which time transpiration in infected U. americana was only about 20 percent as great as that in uninoculated controls. At the same time, water loss from inoculated U. pumila seedlings was 85 percent that of corresponding controls. Starting at the end of 5 weeks and continuing until termination of the experiment, transpiration increased to that of controls in the resistant species but remained about 25 percent in susceptible plants.
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