Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2006
Publication Date: 7/1/2006
Citation: Sanina, A.A., Paholkova, E.V., Chen, X. 2006. Species causing wheat septoria diseases in various regions of russia. APS Abstracts, 96:S103. Jul 29-Aug 2, 2006, Quebec City, Quebec, Canada.
Technical Abstract: Among important fungal diseases on wheat in Russia, Septoria diseases have been dominant. Crop losses from Septoria diseases were up to 30-40%. Epidemics have occurred in 4-5 out of 10 years. From naturally-infected plants in the field, diseased wheat leaves with spots and pycnidia were collected in various regions of Russia. The species were identified by form and size of conidia. Species causing Septoria diseases identified on wheat in Russia were Stagonospora nodorum, Septoria tritici, and Stagonospora avenae triticea. The distributions and epidemic frequencies of the species were different in various regions. S. nodorum prevailed in the northern oblasts. S. nodorum and S. tritici were approximately in equal proportions in the middle oblasts. S. tritici was predominant in the southern oblasts. S. avenae triticea was found almost in all studied areas and was gradually increasing in proportion. Depending on the weather and the growing cultivars, the distribution of individual species in the same region varied from year to year. These species also unevenly distributed within the same field during the growth season. S. tritici prevailed at the early growth stage while S. nodorum increased as the season progressed. Both species were about equal in frequency by the soft dough stage.