SUBSTITUTED PYRIDAZINONES,PROCESSES FOR THEIR PREPARATION,AND THEIR USE AS PESTICIDES

There are provided novel substituted pyridazinones of the general formula (I) in which R is alkyl, haloalkyl, alkoxyalkyl, alkylthioalkyl, (di)alkylaminoalkyl, alkenyl, haloalkenyl, in each case optionally substituted cycloalkyl, cycloalkylalkyl, aryl or aralkyl, R is halogen or alkyl, R and R independently of one another in each case represent hydrogen or alkyl, R and R are hydrogen, carboxyl, in each case optionally substituted straight-chain or branched alkyl, alkenyl, alkoxycarbonyl, aryl, aralkyl, or together with the carbon atom to which they are bonded an optionally substituted saturated or unsaturated carbocycle, R , R , R , R and R independently of one another in each case represent hydrogen, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio or haloalkylthio and X is oxygen or sulphur. The novel compounds of the formula (I) have a highly pronounced activity against pests, in particular a good insecticidal, acaricidal and ovicidal activity.