Isothiazoline compounds of the formula 1.2 wherein A is a group A 2, where A 2 is a group of following formula: wherein # denotes the bond to the remainder of the molecule; W is O; B 1, B 2 and B 3 are each independently CR 2; G 1 and G 2 are each independently CR 4; R 1 is CF 3; each R 2 is independently selected from the group consisting of hydrogen, halogen and C 1 -C 2 -haloalkyl; R 3a, R 3b are each independently selected from the group consisting of hydrogen and halogen; each R 4 is hydrogen; R 5 is hydrogen; R 6a is selected from H, -X-R 6b and -N(R 5a)R 6c; wherein X is selected from -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -, -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 S n -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -S n -C(R a) 2 -, -C(R a) 2 -O-C(R a) 2 -, and -C(R a) 2 -C(R a) 2 -O-C(R a) 2 -, wherein each R a is independently selected from the group consisting of hydrogen and methyl; R 5a has the meaning given for R 5; R 6b is selected from C 2 -C 8 -alkenyl, C 2 -C 8 -haloalkenyl, C 2 -C 8 -alkynyl, C 2 -C 8 -haloalkynyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -halocycloalkyl and C 3 -C 8 -cycloalkyl substituted by a cyano group; R 6c is -C(=O)N(R 14a)R 14b; R 14a is selected from hydrogen and C 1 -C 6 -alkyl; and R 14b is selected from hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, and C 3 -C 6 -cycloalkyl-C 1 -C 4 -alkyl-, where the cycloalkyl moieties in the three last-mentioned groups may be substituted by a cyano group; and C 1 -C 6 -alkyl substituted with a CN group; each n is independently 0, 1 or 2; and the N-oxides, stereoisomers and agriculturally or veterinarily acceptable salts thereof. A is a group A 2, where A 2 is a group of following formula: wherein # denotes the bond to the remainder of the molecule; W is O; B 1, B 2 and B 3 are each independently CR 2; G 1 and G 2 are each independently CR 4; R 1 is CF 3; each R 2 is independently selected from the group consisting of hydrogen, halogen and C 1 -C 2 -haloalkyl; R 3a, R 3b are each independently selected from the group consisting of hydrogen and halogen; each R 4 is hydrogen; R 5 is hydrogen; R 6a is selected from H, -X-R 6b and -N(R 5a)R 6c; wherein X is selected from -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -, -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 S n -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -S n -C(R a) 2 -, -C(R a) 2 -O-C(R a) 2 -, and -C(R a) 2 -C(R a) 2 -O-C(R a) 2 -, wherein each R a is independently selected from the group consisting of hydrogen and methyl; R 5a has the meaning given for R 5; R 6b is selected from C 2 -C 8 -alkenyl, C 2 -C 8 -haloalkenyl, C 2 -C 8 -alkynyl, C 2 -C 8 -haloalkynyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -halocycloalkyl and C 3 -C 8 -cycloalkyl substituted by a cyano group; R 6c is -C(=O)N(R 14a)R 14b; R 14a is selected from hydrogen and C 1 -C 6 -alkyl; and R 14b is selected from hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, and C 3 -C 6 -cycloalkyl-C 1 -C 4 -alkyl-, where the cycloalkyl moieties in the three last-mentioned groups may be substituted by a cyano group; and C 1 -C 6 -alkyl substituted with a CN group; each n is independently 0, 1 or 2; X is selected from -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -, -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 -C(R a) 2 -C(=O)-NH-C(R a) 2 -, -C(R a) 2 S n -C(R a) 2 -, -C(R a) 2 -C(R a) 2 -S n -C(R a) 2 -, -C(R a) 2 -O-C(R a) 2 -, and -C(R a) 2 -C(R a) 2 -O-C(R a) 2 -, wherein each R a is independently selected from the group consisting of hydrogen and methyl; R 5a has the meaning given for R 5; R 6b is selected from C 2 -C 8 -alkenyl, C 2 -C 8 -haloalkenyl, C 2 -C 8 -alkynyl, C 2 -C 8 -haloalkynyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -halocycloalkyl and C 3 -C 8 -cycloalkyl substituted by a cyano group; R 6c is -C(=O)N(R 14a)R 14b; R 14a is selected from hydrogen and C 1 -C 6 -alkyl; and R 14b is selected from hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkynyl, C 2 -C 6 -haloalkynyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halocycloalkyl, and C 3 -C 6 -cycloalkyl-C 1 -C 4 -alkyl-, where the cycloalkyl moieties in the three last-mentioned groups may be substituted by a cyano group; and C 1 -C 6 -alkyl substituted with a CN group; each n is independently 0, 1 or 2;