1. Laboratory of Agrozoology, Department of Crop Protection (M.A., N.D.Z., G.S.), Department of Applied Biosciences (M.A., K.A., N.D.Z., G.H.), Laboratory of Plant Ecology (K.S.), and Laboratory of Phytopathology, Department of Crop Protection (D.D.V.), Faculty of Bioscience Engineering, Ghent University, B–9000 Ghent, Belgium; and