The life cycle of the brown rust of Couch grass from 3 Bohemian localities was studied. It was stated that there are at least 2 different physiologic races of the rust. One of them parasitizing Agropyrum × apiculatum in the mountains České středohoří is obligatorily heteroecious alternating with Thalictrum minus. In this respect it differs from 2 other collections on Agropyrum repens (originating from Central and South Bohemia) in which host alternation does not take place. Moreover, last mentioned races differ in their pathogenicity from the obligatorily heteroecious rust. For all urediniospore collections infection type on 33 grass species, 26 wheat varieties, 20 rye varieties, 1 barley variety and 4 wheat-couch grass hybrids and 2 wheat-rye hybrids was stated. Some species of Bromus and Couch grass were compatible. Wheats and their hybrids showed necrotic spots only. A part of rye plants inoculated produced uredinia of the susceptible type of infection.
Ondráčková J., Urban Z. (1972): Infection experiments with Puccinia perplexans Plow. var. triticina (Eriks.) Urban f. sp. persistens in Bohemia. – Česká Mykologie 26(1): 9–22.
