FIELD: agriculture.
SUBSTANCE: invention relates to agriculture. For controlling aquatic weeds in a body of water the method comprises providing in the body of water a composition comprising a herbicidally effective amount of a compound of formula I 
,wherein Q1 represents H or F; Q2 represents halogen with the proviso that when Q1 is H, then Q2 is Cl or Br; R1 and R2 independently represent H, C1-C6-alkyl, C3-C6-alkenyl, C3-C6-alkynyl, hydroxy group, C1-C6-alkoxy, amino group, C1-C6-acyl, C1-C6-carbalkoxy group, C1-C6-alkylcarbamyl, C1-C6-alkylsulfonyl, C1-C6-trialkylsilyl or C1-C6-dialkylphosphonyl or R1 and R2, taken together with the N atom represent a 5- or 6-membered saturated ring; and Ar represents a polysubstituted aryl group selected from the group consisting of a) 
wherein W1 represents halogen; X1 represents F, Cl, C1-C4-alkyl, C1-C4-alkoxy group, C1-C4-alkylthio group, C1-C4-alkylsulfinyl, C1-C4-alkylsulfonyl, C1-C4-haloalkyl, C1-C4-haloalkoxy group, C1-C4-alkoxy-substituted C1-C4-alkyl, C1-C4-alkoxy-substituted C1-C4-alkoxy group, -CN, -NR3R4, or fluorinated acetyl, or propionyl; Y1 represents C1-C4-alkyl, C1-C4-haloalkyl, halogen or -CN or, if X1 and Y1 are taken together, represents -O(CH2)nO-, where n=1 or 2; and R3 and R4 independently represent H or C1-C4-alkyl; b) 
wherein W2 represents F or Cl; X2 represents F, Cl, -CN, -NO2, C1-C4-alkyl, C1-C4-alkoxy group, C1-C4-alkylthio group, C1-C4-alkylsulfinyl, C1-C4-alkylsulfonyl, C1-C4-haloalkyl, C1-C4-haloalkoxy group, C1-C4-alkoxy-substituted C1-C4-alkyl, C1-C4-alkoxy-substituted C1-C4-alkoxy group, -NR3R4, or fluorinated acetyl, or propionyl; Y2 represents halogen, C1-C4-alkyl, C1-C4-haloalkyl or -CN, or, if W2 represents F, X2 and Y2, taken together, represent -O(CH2) nO-, where n=1 or 2; and R3 and R4 independently represent H or C1-C6-alkyl; and c) 
wherein Y3 represents halogen, -CN or -CF3; Z3 represents F, Cl, -CN, -NO2, C1-C4-alkyl, C1-C4-alkoxy group, C1-C4-alkylthio group, C1-C4-alkylsulfinyl, C1-C4-alkylsulfonyl, C1-C4-haloalkyl, C1-C4-haloalkoxy group, C1-C4-alkoxy-substituted C1-C4-alkyl, C1-C4-alkoxy-substituted C1-C4-alkoxy group, -NR3R4, or fluorinated acetyl, or propionyl; and R3 and R4 independently represent H or C1-C6-alkyl; and agriculturally acceptable derivatives of the carboxylic acid group.
EFFECT: invention provides more effective control of aquatic weeds.
13 cl, 3 tbl
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