VIEW ARTICLE

Temperature Effects on Lesion Development and Sporulation After Infection by Races O and T of Bipolaris maydis. H. L. Warren, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Purdue University, West Lafayette, Indiana 47907; Phytopathology 65:623-626. Accepted for publication 10 January 1975. DOI: 10.1094/Phyto-65-623.

Bipolaris maydis races O and T sporulated on corn leaf tissue at 15, 22.5, and 30 C. Spore production by B. maydis race T was sensitive to temperature, whereas production by race O was less sensitive. At 15 C, few race T spores were produced. The greatest number of spores was produced at 30 C for both races. However, race T produced five times more spores at 22.5 C, and two times more at 30 C than race O. More lesions formed, and expanded more rapidly at 30 C than at 22.5 or 15 C. Lesion size differed markedly between inbreds containing cms-T cytoplasm inoculated with race T. Differences in lesion size between inbreds containing normal cytoplasm inoculated with race O were smaller.