Tag Archives: Blumeria graminis

385-388 P. Sooväli and A. Bender
The occurrence of powdery mildew on crested hairgrass in different growing conditions
Abstract |

The occurrence of powdery mildew on crested hairgrass in different growing conditions

P. Sooväli and A. Bender

Jõgeva Plant Breeding Institute, 48309 Jõgeva, Estonia; e-mail: pille.soovali@jpbi.ee

Abstract:

Crested hairgrass (Koeleria gracilis Pers., syn. K. macrantha (Ledeb.) is classed as a good turfgrass. A first cultivar ‘Ilo’, released by the Jõgeva Plant Breeding Institute was entered into the Estonian Variety List in 1997. Seed production agrotechnics of crested hairgrass cultivar ‘Ilo’ was studied in field experiments at the Jõgeva PBI in 2001–2005. It has been recognized that the incidence and severity of disease level and seed yield losses are influenced by pathogens and weather. For four seasons the severity of the occurrence of powdery mildew (Blumeria graminis DC.) was investigated in these field trials. Disease infection was scored by visual assessment of full plants at shooting, flowering and seed ripening stages and at post–harvest re-growth on a 5–point scale. Infection was more intensive in the flowering stage: 2.6 points (2002), 3.0 (2003) and 3.7 (2004). Infection at post–harvest re-growth was assessed at 3.1 points in 2002.

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389-392 P. Sooväli, M. Koppel and H. Nurmekivi
Optimization of chemical disease control in spring wheat
Abstract |

Optimization of chemical disease control in spring wheat

P. Sooväli, M. Koppel and H. Nurmekivi

Jõgeva Plant Breeding Institute, 48309 Jõgeva, Estonia; e-mail: pille.soovali@jpbi.ee

Abstract:

Septoria leaf blotch complex (Septoria tritici and Septoria nodorum) and powdery mildew (Blumeria graminis) are common foliar diseases of spring wheat in Estonia. This paper reports results of multi-site field experiments performed on spring wheat varieties Tjalve and Munk during 2003–2004 in Estonia. Fungicides Falcon 460 EC and Opera were used in full and reduced doses of one or split applications. The aim of the current study was to obtain efficient disease control and to identify the impact of fungicide application on yield at the time of fungicide application. The biological efficiency of fungicides was assessed based on disease scorings made until growing stages 75–77. The trial results show that biologically and economically effective control of wheat diseases could be achieved with timely use of lowered fungicide doses. Spraying at growing stages 41–55 will often be enough to achieve good control of serious attacks by Septoria.

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