O-ETHYL-S-n-PROPYL-O-PYRAZOLO(1,5-a)-PYRIMIDIN-(2)YL!-THIONOTHIOLPHOSP HORIC ACID ESTERS O-Ethyl-S-n-propyl-O-pyrazolo(1,5a)-pyrimidin(2)-yl!-thionothiolphosph oric acid esters of the formula (I) in which R is hydrogen or halogen, R1 is alkyl with 1 to 5 carbon atoms or hydrogen, R2 is hydrogen, halogen or acetyl, and R3 is hydrogen, alkyl with 1 to 4 carbon atoms or carbalkoxy with 1 to 4 carbon atoms in the alkyl radical, which possess arthropodicidal and nematicidal properties.
O-ETHYL-S-N-PROPYL-O-(PYRAZOLO(1,5-A)-PYRIMIDIN-(2)YL)-THIONOTHIOLPHOSPHORIC ACID RS