Patent ID: 8906829

Claim:
A mixture effective in controlling the growth of algae, the mixture including copper and a hydrazone compound of Formula 1: wherein W is —CHR1-; n is 0 or 1; R is H, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 1 -C 6 haloalkyl, C 2 -C 6 haloalkenyl, C 2 -C 6 haloalkynyl, or C 3 -C 6 halocycloalkyl; R1 is H, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, and C 2 -C 6 alkynyl; X 3 , X 4 , X 5 , and X 6 are each independently selected from the group consisting of H, halogen, nitro, hydroxyl, cyano, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkylthio, C 1 -C 4 haloalkyl , C 1 -C 4 haloalkoxy, C 2 -C 4 haloalkenyl, C 2 -C 4 haloalkynyl, C 1 -C 4 haloalkylthio, —SO 2 R1, —SONR1R1, —CR1=NOR1, —CONR1R1, —NR1COOR1, and —COOR1; and Y 2 , Y 3 , Y 4 , Y 5 , and Y 6 are each independently selected from the group consisting of H, halogen, nitro, hydroxyl, cyano, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkylthio, C 1 -C 4 halo alkyl , C 1 -C 4 haloalkoxy, C 2 -C 4 haloalkenyl, C 2 -C 4 haloalkynyl, C 1 -C 4 haloalkylthio, —SO 2 R1, —SONR1R1, —R1=NOR1, —CONR1R1, —NR1COOR1, —COOR1, and —NR1R1; with the proviso that when Y 2 is a hydoxyl group, then X 3 , X 4 , X 5 and X 6 are not all H, wherein the copper and the hydrazine compound are present in a ratio such that the mixtures exhibit synergistic algicidal activity.