The influence of phosphite treatments on oak leaves and damage caused by powdery mildew Erysiphe alphitoides

Autorzy

• Piotr Andrzej Dąbrowski Warsaw University of Life Sciences-SGGW, Faculty of Civil and Environmental Engineering,
  Department of Environmental Improvement, Nowoursynowska 159, 02-776 Warsaw, Poland
• Hazem Kalaji Warsaw University of Life Sciences-SGGW, Faculty of Agriculture and Biology, Department of Plant Physiology, Nowoursynowska 159, 02-776 Warsaw, Poland
• Nenad Keča University of Belgrade-Faculty of Forestry, Department of Forestry, Kneza Višeslava 1, 11030 Belgrade, Serbia, e-mail: nenad.keca@sfb.bg.ac.rs
• Tomasz Horaczek Institute of Technology and Life Sciences, Department of Plant Production Engineering, 05-825 Kłudzienko, Poland
• Tomasz Oszako Bialystok University of Technology, Faculty of Forestry in Hajnówka
  Hajnówka, Poland

Abstract

The aim of the project was to check the influence of ammonium phosphite preparation − Actifos on the physiology of leaves and a possible reduction of infection by the fungus a year after the application of fertilizer. Three observation plots were selected in Karczma Borowa, Krotoszyn and Piaski Forest Districts (FD). In each of these observation plots, trees were chosen randomly. In Karczma Borowa FD, the trees were treated by watering them with a 3% solution of Actifos. In Krotoszyn FD, the leaves of trees were sprayed twice (in July and September) from the plane using a 50% solution of Actifos; and in Piaski FD, only the trunks of tress were sprayed twice the same way, but in July 2012 and September 2013. In October 2013, from each tested tree, ten leaves were selected randomly from the upper, well-lit parts of their crowns. The assessment of leaf surface damaged by mycelium and chlorophyll a fluorescence was performed. After the application of the phosphite, no negative physiological consequences for the treated trees were noticed − neither concerning the average leaf area nor the fluorescence of chlorophyll. The manner of phosphite application (leaves, trunks or roots) did not cause any negative consequences for the vitality/health of the treated trees as compared to the control trees. A certain tendency in the reduction of oak mildew on the treated leaves with phosphite was observed, however these observations should be continued in the next years.

Keywords

• powdery mildew
• chlorophyll fluorescence
• phosphite fertilizers
• oak