If we apply BeetCast, we can do this on base of the high inpact of relative humdidty and leaf wetness on the epidemics of c.beticola, what ahs been found again by Wolf P.F.J. et al (2001). The results of this resarcher team is displayed in the two graphs at the right side of this article.
Disease Severity Evaluation Model:
This model is calculated at the end of a day 11:30pm. The model calculates and compares the disease severity values following the tables below.
BeetCast Prediction rules:
To come to rules for fungicide application Beetcast is combined with the output of the CercoPRI model. It could be the prognosis of the first spray by the Pessl Instruments Risk model or by the DIV model to be used in the same way.
Where CercoPRI reaches treshold before 01.06. apply first fungicide when 55 DSV units are accumulated repeat spray when 35 DSV units are reached again
CercoPRI reaches treshold before 01.07. apply first fungicide when 70 DSV units are accumulated repeat spray when 55 DSV units are reached again
CercoPRI reaches treshold after 01.07. apply first fungicide when 80 DSV units are accumulated repeat spray when 55 DSV units are reached again