Organic phosphates of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are respectively an alkyl group; R.sup.3 is a phenyl group which is substituted at least by a pyridazinyloxy or pyridazinylthio group in which the pyridazinyl group may be substituted; and X is an oxygen or sulfur atom, or a salt thereof, have marked insecticidal-acaricidal activity against plant pests and mites, household pests, with very low toxicity to warm-blooded animals and fish.
该公式的有机
磷酸盐为:##STR1## 其中R.sup.1和R.sup.2分别是烷基基团;R.sup.3是苯基团,至少被
吡啶并氧基或
吡啶硫基取代,其中
吡啶基可能被取代;X是氧或
硫原子,或其盐,对植物害虫和螨虫、家庭害虫具有显著的杀虫-杀螨活性,对温血动物和鱼类毒性非常低。