Pyridazin-3-one derivatives, their use and intermediates for their production

Novel pyridazin-3-one derivatives of formula [1] ##STR1## are provided, which are useful as active ingredients of herbicides, wherein R.sup.1 is haloalkyl; R.sup.2 and R.sup.3 are hydrogen, alkyl, haloalkyl, or alkoxyalkyl; and Q is [Q-1], [Q-2], [Q-3], [Q-4] or [Q-5]. Also provided are their use and intermediates for their production.