1. Biooptics Laboratory, Department of Biological Physics, Eötvös University, H-1117 Budapest, Pázmány sétány 1,Hungary,
2. Plant Protection Institute of the Hungarian Academy of Sciences,Department of Zoology, H-1525 Budapest, P. O. B. 102, Hungary
3. International University Bremen IUB, School of Engineering and Science, P. O. B. 750561, D-28725 Bremen-Grohn, Germany