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Responses of Detached Tissues of Adult Wheat Plants to Puccinia graminis tritici. A. H. Atif, Former U.S.A.I.D. Fellow and now Plant Pathologist, Darul-amon Research Station, Kabul, Afghanistan; Roy D. Wilcoxson, Professor, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108. Phytopathology 65:318-321. Accepted for publication 4 October 1974. DOI: 10.1094/Phyto-65-318.

Stem rust (Puccinia graminis f. sp. tritici) was studied on detached flag leaves, leaf sheaths, and peduncles from adult plants of ten wheat cultivars in benzimidazole and kinetin solutions. The infection type, incubation period, and severity of rust varied with cultivars, addition of glucose to the kinetin and benzimidazole solutions, time of tissue detachment in relation to inoculation, and age of the plants. Temperature did not influence infection type or stem rust severity, but did alter the incubation period. The interactions of cultivars with benzimidazole treatments, and with the time of tissue detachment in relation to inoculation, were significant. Stem rust development was excellent on all the detached plant parts, but it was less on older tissues than on younger ones.