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Effect of Temperature on Development of Kabatiella caulivora in Trifolium subterraneum. Katie Helms, Division of Plant Industry, Commonwealth Scientific and Industrial Research Organisation, Canberra City, A.C.T. 2601; Phytopathology 67:230-233. Accepted for publication 16 August 1976. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-230.

Effects of temperature on development of clover scorch (northern anthracnose), which is incited by Kabatiella caulivora, were examined in Trifolium subterraneum ‘Yarloop’. Relatively high day/night temperatures (30/25 C or 33/28 C) for 1-7 days before inoculation accelerated leaf development and predisposed plants to infection. For establishment of infection during days 1 to 4 after inoculation (under low light and high humidity), temperatures of 16, 20, and 24 C were more favorable than 28 C. For development of the disease during days 4 to 11 after inoculation (under natural light and uncontrolled humidity), the optimum temperature range was 8-20 C. For plants kept at 20, 24, and 28 C during days 4 to 11, a reduction in light intensity to one-tenth of natural light did not significantly affect development of the disease.