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EPIDEMIC OUTBREAKS OF STRIPE RUST CAUSED BY PUCCINIA STRIIFORMIS ON NATURAL POPULATION OF LOLIUM PERENNE IN TURKEY

H. KAVAK^*

Abstract: Stripe rust caused by Puccinia striiformis was found for the first time on Lolium perenne L., in Turkey. Based on surveys conducted during two years, an epidemic level of the infection was observed. Disease rate and severity were measured in 20 local areas in the Malatya region within eastern Anatolia district of Turkey. Disease rates on flag, 2^nd and 3^rd leaves were 9.45%, 29.75% and 75.95% in 2003, and 12.10%, 35.70% and 91.75% in 2004, respectively. Disease severities on same leaves were 0.20%, 2.81% and 27.50% in 2003, and 0.41%, 3% and 30.09% in 2004, respectively. Ten accessions of the ryegrass were tested to the stripe rust under natural conditions to determine their resistance levels. Based on the averages of the upper three leaves, 7 degrees of the disease were observed in accessions with 3 resistance levels were determined in accessions. In suitable years, yellow rust appears as a restrictive agent on the natural populations of ryegrass while infected ryegrass population may institute the permanent infection sources of the disease in the district. This study exposes the host status of the ryegrass to the yellow rust disease.

Plant Protection Department, Agricultural Faculty, University of Harran Şanlıurfa 63040, Turkey.