A diaminotriazine compound of formula wherein q is 0, 1, 2 R a is selected from the group consisting of C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyloxy, C 2 -C 6 -haloalkenyloxy, C 2 -C 6 -alkynyloxy, C 2 -C 6 -haloalkynyloxy,, C 3 -C 6 -cycloalkoxy, C 3 -C 6 -halocycloalkoxy, (C 3 -C 6 -cycloalkyl)-C 1 -C 4 -alkoxy, (C 3 -C 6 -halocycloalkyl)-C 1 -C 4 -alkoxy, (C 1 -C 6 -alkoxy)-C 1 -C 6 -alkoxy; R b is selected from the group consisting of halogen,; R 1 is selected from the group consisting of H, C 1 -C 6 -alkyl, (C 1 -C 6 -alkyl)carbonyl, (C 1 -C 6 -alkoxy)carbonyl;; R 2 is selected from the group consisting of H, C 1 -C 6 -alkyl, (C 1 -C 6 -alkyl)carbonyl, (C 1 -C 6 -alkoxy)carbonyl; R 3 is selected from the group consisting of hydrogen, fluorine, chlorine, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy; R 4 is selected from the group consisting of H, CN, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 1 -C 6 -alkoxy and C 1 -C 6 -haloalkoxy; R 5 is selected from the group consisting of CN, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 3 -C 6 -alkynyl, C 3 -C 6 -cycloalkyl, (C 3 -C 6 -cycloalkyl)-C 1 -C 4 -alkyl, C 3 -C 6 -cycloalkenyl and C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, where the aliphatic and cycloaliphatic parts of the 7 aforementioned radicals are unsubstituted, partly or completely halogenated; or R 4 and R 5 together with the carbon atom to which they are attached may form a moiety selected from the group consisting of carbonyl, C 3 -C 6 -cycloalkan-1,1-diyl, ipso-C 3 -C 6 -cycloalkendiyl, three- to six-membered saturated or partially unsaturated ipso-heterocyclodiyl, where the carbocycle and the heterocycle are unsubstituted, partly or completely halogenated or carry from 1 to 6 C 1 -C 6 -alkyl groups, and the moiety >C=CR x R y, where R x and R y are hydrogen, C 1 -C 4 -alkyl or C 1 -C 4 -haloalkyl; including their agriculturally acceptable salts. q is 0, 1, 2 R a is selected from the group consisting of C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyloxy, C 2 -C 6 -haloalkenyloxy, C 2 -C 6 -alkynyloxy, C 2 -C 6 -haloalkynyloxy,, C 3 -C 6 -cycloalkoxy, C 3 -C 6 -halocycloalkoxy, (C 3 -C 6 -cycloalkyl)-C 1 -C 4 -alkoxy, (C 3 -C 6 -halocycloalkyl)-C 1 -C 4 -alkoxy, (C 1 -C 6 -alkoxy)-C 1 -C 6 -alkoxy; R b is selected from the group consisting of halogen,; R 1 is selected from the group consisting of H, C 1 -C 6 -alkyl, (C 1 -C 6 -alkyl)carbonyl, (C 1 -C 6 -alkoxy)carbonyl;; R 2 is selected from the group consisting of H, C 1 -C 6 -alkyl, (C 1 -C 6 -alkyl)carbonyl, (C 1 -C 6 -alkoxy)carbonyl; R 3 is selected from the group consisting of hydrogen, fluorine, chlorine, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy; R 4 is selected from the group consisting of H, CN, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, C 1 -C 6 -alkoxy and C 1 -C 6 -haloalkoxy; R 5 is selected from the group consisting of CN, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 3 -C 6 -alkynyl, C 3 -C 6 -cycloalkyl, (C 3 -C 6 -cycloalkyl)-C 1 -C 4 -alkyl, C 3 -C 6 -cycloalkenyl and C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, where the aliphatic and cycloaliphatic parts of the 7 aforementioned radicals are unsubstituted, partly or completely halogenated; or R 4 and R 5 together with the carbon atom to which they are attached may form a moiety selected from the group consisting of carbonyl, C 3 -C 6 -cycloalkan-1,1-diyl, ipso-C 3 -C 6 -cycloalkendiyl, three- to six-membered saturated or partially unsaturated ipso-heterocyclodiyl, where the carbocycle and the heterocycle are unsubstituted, partly or completely halogenated or carry from 1 to 6 C 1 -C 6 -alkyl groups, and the moiety >C=CR x R y, where R x and R y are hydrogen, C 1 -C 4 -alkyl or C 1 -C 4 -haloalkyl; including their agriculturally acceptable salts.