Disease progress and pycnidia development of Septoria on winter wheat in relation to climatic conditions [in Germany]
1994
Dickopp, S. | Hindorf, H. (Rheinische Friedrich-Wilhelms-Univ., Bonn (Germany). Inst. fuer Pflanzenkrankheiten)
To develop decision-making systems for agricultural crops to predict optimum fungicide application precise data on disease occurrence is needed. In general disease assessment carried out in the field is used to determine the first appearance of the disease and/or damage exceeding threshold levels. A prediction of climatic data does not alone lead to precisely working decision system with Septoria. Therefore, the number of pycnidia were counted to describe the disease progress curve. In the Rhineland from 1989 to 1992 at four different localities, disease assessments were carried out in winter wheat. Rainfall and temperature patterns were also recorded. A high incidence of disease in 1989 correlated with average rainfall and temperatures of 10-25 degrees from mid June to the end of July. In 1990 disease development was weak due to low rainfall and temperatures between 15 and 23 degrees. In 1991 the disease started late the end of June, but reached moderate to high incidences. In 1992 the first appearance of the disease occurred at the end of May, but due to a continuation of dry weather in June the incidence of Septoria was not severe.
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