Different herbicides and insecticides have been tested concerning their side effects on the fauna (arthropodes, nematoda, enchytraeidae) of a forest soil. Although the pesticide impact on the individual groups of soil organisms differs very strongly, insecticides exhibit a much stronger negative effect (relative sequence: Lindan > Cyfluthrin > Bendiocarb) than the herbicides (relative sequence: Dichlorprop > Isoproturon > Bentazon). Only weakly pronounced synergistic effects were found with combined pesticides. Based on the gathered experience, protozoa, nematoda, lumbricidae, enchytraeidae, araneida, acarina, collembola, coleoptera, diptera and hymenoptera are proposed as indicators for field tests. Soil photo eclectors have be...