VIEW ARTICLE

Ecology and Epidemiology

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.