Research assistant at the Department of Seed Sciences and Population Genetic, Hohenheim University, Stuttgart, Germany. 1) Ecology of weeds and crops. 2) Optimization and design of in vitro techniques for assessing parasitisms of weeds in early stages of infection in crops. Reseach assistant at the Department of Plant Pathology, Forest Pathology Laboratory. The Ohio State University, United States, Columbus, 1)Resistance mechanisms against Emerald Ash Borer EAB in Ash tree.