A decision model to control diseases on spring and winter barley in particular consideration of Rhynchosporium secalis
1994
Appel, J. | Zinkernagel, V. (Technische Univ. Muenchen, Freising-Weihenstephan (Germany). Lehrstuhl fuer Phytopathologie)
The IPP (Integrated Plant Protection) Barley is a disease threshold based decision support system to control barley diseases on spring and winter barley. Threshold values for Rhynchosporium secalis and Erysiphe gaminis are defined as incidence of infection on different leaf layers according to the actual growth stage. The threshold value to control Puccinia hordei is based on incidence of infection per plant, whereas incidence of sporulation is used to estimate the need of an application to control Drechslera teres and Bipolaris sorokiniana. The use of the decision model requires exact qualitative and quantitative diagnosis of the occurring pathogens which is based on a 30 plant sample. If a threshold value is reached in combination with suitable weather criteria a fungicide application is indicated. The knowledge of the entire disease situation of a crop enables to choose the most effective fungicide to control the target disease and to use side-effects on other pathogens.
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