Establishment, Distribution, and Pathogenicity of Puccinia striiformis f. sp. tritici in South Africa

• DOI: 10.1094/pdis.2002.86.5.485
• Publication Date: 2007-05-11T10:14:36Z
• Authors: W. H. P. Boshoff; Z. A. Pretorius; B. D. van Niekerk
• Keywords: Puccinia; Rust (programming language); Dactylis glomerata; Poa annua

Stripe rust, caused by Puccinia striiformis Westend. f. sp. tritici Eriks., has become an endemic disease of wheat (Triticum aestivum L.) in South Africa since it was first observed near Moorreesburg, Western Cape during August 1996. The main objectives this study were to monitor the occurrence, spread, and possible development new variants stripe rust pathogen susceptibility grass species pathogen. Results surveys conducted 1996 1999 revealed that rainfed produced Cape, Eastern eastern Free State, as well irrigated KwaZulu-Natal are most likely be affected epidemics. Pathotype 6E16A- with virulence Yr2, Yr6, Yr7, Yr8, Yr11, Yr14, Yr17, Yr19 pathotype 6E22A- added Yr25 detected. occurrence is currently restricted State. isolates found on Hordeum murinum L. identified 6E16A-, both pathotypes collected from Bromus catharticus Vahl (= B. unioloides H.B.K.) Sate. Urediospores infections similar Dactylis glomerata (Eastern Cape), Poa pratensis P. bidentata Stapf; annua triviales (eastern State) failed infect cv. Morocco seedlings glasshouse. role grasses over-summering not yet been established. infections, however, have summer-sown south 1998, volunteer growing summer autumn months State 1998 2000, Lesotho.