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Gewählte Publikation:

Kaiser, U; Rossner, H; Varrelmann, M; Marlander, B.
(2007): Reaction of sugarbeet varieties with different susceptibility to the infestation with Cercospora beticola
ZUCKERINDUSTRIE. 2007; 132(3): 183-194.

In the present work it was investigated how sugarbeet varieties with different susceptibility to Cercospora beticola vary in terms of epidemical progress of foliar diseases and how control strategies with delayed fungicide application influence yield and quality of these varieties. For this purpose, in 2004 and 2005 two trial series in Germany and Austria were conducted including seven sites per year, six varieties, and eight control strategies (series foliar diseases I), or eight sites, two varieties, and six control strategies (series foliar diseases II) respectively. The control strategies were based on the summary threshold system 5/15/45% disease incidence (DI) of infected leaves (Cercospora beticola, Erysiphe betae and Ramularia beticola). From the end of June the DI and disease severity (DS) for each foliar disease were assessed regularly and root yield, sugar content, and technical quality were determined after harvest in autumn. The development of the DI mostly increased asymptotically until reaching values of 100%. The summary threshold was reached in the series foliar diseases I in nearly every environment (site x year) and by all varieties, whereas in the series foliar diseases II it was reached very late if at all. Depending on environment and variety, the DS of Cercospora beticola developed differently. Disease severities at harvest (DSharvest) exceeding 20% caused clear differences among varieties. Under low (DSharvest < 5%) and medium (DSharvest 5-20%) infestation differences in white sugar yield loss (WSYloss) among control strategies were only found in individual cases. Under high infestation (DSharvest > 20%), the WSYloss, due to the control strategies was significantly different for the susceptible varieties. Under low and medium infestation, the fungicide application in most cases was unnecessary. Under high infestation, fungicides had to be applied to the susceptible varieties as the summary threshold was reached, whereas the less susceptible varieties did not essentially require any fungicide application.
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Find related publications in this database (Keywords)
foliar diseases
integrated crop protection
summary threshold system

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