Epidemiology and Control of Seed-Borne Drechslera teres on Barley
Net blotch caused by Drechslera teres is an important disease in most barley-growing areas. To prevent the introduction of this pathogen into the field, seed treatment is recommended. The objectives of this research were to evaluate different fungicides for eradicating D. teres from the seed and the role of both infected and treated seeds in the epidemiology of the disease under field conditions. The three fungicides tested in vitro (iminoctadine, guazatine, and thiram + iprodione) were able to eliminate D. teres at the highest dose used in this study. Under field conditions, eradication of the pathogen was not achieved, but net blotch was significantly reduced.
KeywordsPyrenophora teres fungicides Hordeum distichum
Unable to display preview. Download preview PDF.
- Barreto, D., Carmona, M. 1993. Microflora of barley seed and malt in Argentina. Proceedings 1st ISTA. Plant Disease Committee. Symposium on Seed Health Testing. Ottawa, Canada, August 9–11, 1993, pp. 70–74.Google Scholar
- Carmona, M. 1994. Distribución, incidencia y severidad de las enfermedades foliares de la cebada cervecera en la provincia de Buenos Aires en 1992 (Distribution, incidence and severity of foliage diseases of barley in Buenos Aires province in 1992). Fitopatología 29:214–217.Google Scholar
- Carmona, M., Barreto, D.E., Reis, E.M. 1999. Detection, transmission and control of Drechslera teres in barley seed. Seed Sci. and Technol. 27:761–769.Google Scholar
- Jorgensen, J. 1983. Disease testing of barley seed and application of test results in Denmark. Seed Science & Technology 11:615–624.Google Scholar
- Leach, C.M. 1979. A Theoretical Consideration of the Epidemiology of Seed-borne Plant Pathogens. Seed Pathology Problems and progress. Proceedings of the First Latin American Workshop on Seed Pathology. Londrina, Brazil, pp. 227–233.Google Scholar
- Maude, R.B. 1983. Eradicative seed treatment. Seed Sci. and Technol. 11:907–920.Google Scholar
- Reis, E.M., Santos, H.P. 1985. Populacao de Helminthosporium sativum no ar quatificado atraves de uma armadilha tipo cata-vento (Population of Helminthosporium sativum in the air quantified through a spore trap). Fitopatologia Brasileira 10:515–519.Google Scholar
- Reis, E.M., Casa, Trezzi, R., Silva, M.S. 1995. Efeito do tratamento de sementes de cevada no controle e no desenvolvimento da mancha em rede, causada por Drechslera teres (Effect of seed treatment on the control and development of net blotch in barley caused by Drechslera teres). Fitopatologia Brasileira 20:561–565.Google Scholar
- SAS. Institutes Inc. 1988. SAS/Stat User’s Guide. Release 6.03 Edition. Cary, NC, USA.Google Scholar
- Schilder, A.M., Bergstrom, G.C. 1992. Infection of wheat seed by and seed transmission of Pyrenophora tritici-repentis. In: Francl, L., Krupinsky, J.M., Mc Mullen, M.P. (eds), Proceedings of Second International Tan Spot Workshop, North Dakota State University, Fargo, ND. pp. 56–60.Google Scholar
- Shipton, W.A., Khan, T.N., Boyd, W.J. 1973. Net blotch of barley. Review of Plant Pathology 52:269–290.Google Scholar
- Smedegard-Petersen, V. 1974. Reduction in yield and grain size of barley due to attack by the net blotch fungus Pyrenophora teres. Royal Veterinary and Agricultural University Yearbook, 1974, Copenhagen, pp. 108–117.Google Scholar