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Distribution and race composition of downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni) in Bulgaria


, : Distribution and race composition of downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni) in Bulgaria. Helia 23(33): 25-32

Downy mildew caused by the fungus P. halstedii is the main disease on sunflower in Bulgaria. In recent years a number of authors have reported the occurrence of new more virulent races of the pathogen. According to other authors these races demonstrate resistance to the fungicides used up to now. This fact is rather alarming and imposes the necessity of annual researches with the aim of following the changes in the downy mildew race variability.


Accession: 003408964

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Related references

Shindrova, P., 2005: New nomenclature of downy mildew races in sunflower (Plasmopara halstedii Farl. Berlese et de Toni) in Bulgaria (race composition during 2000-2003). A new unified nomenclature system of downy mildew races was introduced in 2000 (Tourvieille et al., 2000). The present study aims to determine the distribution and race composition of sunflower downy mildew in Bulgaria according to this new nomenc...

Anonymous, 2006: Downy mildew (Plasmopara halstedii Farl. Berlese et de Toni) - distribution and race composition during 2004-2005

Kumar, B.R.P.; Kulkarni, M.J.; Rao, B.N.V.; Chandrika, K.; Gowda, V.R.B.; Prasad, D.T., 2000: Biochemical and histological changes associated with downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni) infection in sunflower (Helianthus annuus L.). Biochemical changes associated with downy mildew infection in sunflower cv. Morden (caused by P. halstedii) revealed an increase in the total soluble proteins, 0-40% ammonium sulfate fractionated proteins and total soluble sugars. Molecular sieve...

Veena Rao, B.N.; Chandrika, K.; Balakrishna Gowda; Theertha Prasad, D., 1998: Downy mildew disease caused by Plasmopara halstedii (Farl.) Berl. and de Toni. in sunflower (Helianthus annuus L): identification of pathogenesis related proteins and histological changes. The results of an histological study of the infection of sunflower (cv. Morden) by P. halstedii indicated that downy mildew causes extensive cellular changes, leading to hypertrophism and leakage of the cellular contents. A reduction in the total...

Iuoras, M.; Vasile, C.; Vranceanu, A.V.; Gresshoff, P.M., 2002: The identification of molecular markers associated with Pl2 gene of sunflower resistance to Plasmopara halstedii (Farl.) Berl and de Toni, race 2. RAPD and DAF analysis of sunflower inbred lines RHA 295Pl2 and HA 821pl2, and bulk segregant analysis on descendants of the cross between the 2 inbreds, were used to identify the molecular markers associated with downy mildew (P. halstedii) resist...

Vranceanu, V.S.oenescu, F., 1970: An inbred line immune to sunflower downy mildew (Plasmopara halstedii (Farl.) Berl. et De T.)

Vranceanu, V.; Stoenescu, F., 1968: An inbred line immune to sunflower downy mildew (Plasmopara halstedii (Farl.) Berl. et de T. Repeated individual selection for resistance failed in 12 sunflower varieties. Nine inbred lines gave similar results but AD66 was immune both in the laboratory and in the field. This line was obtained after repeated selfing of the hybrid variety...

Chattopadhyay, C.; Appaji, S., 2000: Factors affecting Plasmopara halstedii (Farl.) Berl. and de Toni. Factors affecting the infectivity of P. halstedii were studied in pot experiments. Infection was maximum in 3-d-old sunflower seedlings and was zero in 21-day-old ones. Maximum growth and sporulation of the fungus occurred at 16+or-1 degrees C and...

Bekesi, P., 1975: Demonstration of Plasmopara Halstedii (Farl): Berl. et de Toni in sunflower tissues; sublatent and latent infection

Allard, C., 1978: Invasion and systemic colonization of sunflower (Helianthus annuus L.) seedlings by Plasmopara halstedii (Farl.) Berl. & de Toni. Histological methods were used to study the mode of infection. Systemic colonization of the internodes resulted from infection of the very young leaf blades, or, before these were differentiated, from the pith of the hypocotyl axis. In very young...