Penetration of surface applied deltamethrin micro-emulsion formulations in four European timber species
P Esser, W L D Suitela, A J Pendlebury
The Netherland's Government, in line with many other European Governments initiated a programme (KWS2000) aimed at significantly reducing the emission of volatile organic compounds by the year 2000. As part of this programme a research project is currently underway to evaluate the potential for replacing organic solvent based remedial treatments with micro-emulsion formulations of the same or enhanced insecticidal activity. To date the project has evaluated the penetration of a deltamethrin micro-emulsion formulation in four species, notably, Scots pine (Pinus sylvestris) sapwood and heartwood, Norway spruce (Picea abies) heartwood, Douglas fir (Pseudotsuga menziesii) heartwood and European oak (Quercus petraea) heartwood. The test method used, an adapted version of the German standard DIN 52 162, subsequent a.i. distribution analyses and results are discussed.