Effect of macro- and micronutrients content in sugar beet leaves and weather conditions on infection by Cercospora beticola Sacc.

摘要

Samples of sugarbeet leaves infected by C. beticola were collected from fields in Kujawsko-Pomorskie region, Poland, during 2005-08. The level of infection was presented as percent leaf infection. It was estimated using an infection scale of 1.0-9.0, with 1.0 for lack of infection and 9.0 for leaf area infection of more than 75%. The contents of micro- and macronutrients were evaluated. The correlation between infection and content of micro- and macronutrients was estimated at p<0.05 level. The increase in the contents of nitrogen, phosphorus, potassium and copper reduced the infection level. High contents of magnesium and manganese stimulated the infection level.