Claim 1: A method of control of aquatic weeds in the body of water includes providing in the body of water a composition with an herbicidal amount of a compound of the formula (1) wherein Q¹ represents H or F； Q² represents a halogen with the condition that Q¹ is H then Q² is Cl or Br； R¹ and R² independently represent H, C₁₋₆ alkyl,C₃₋₆ alkenyl,1. C 83238331 asphalt；hydroxy, C₁₋₆ alkoxy,amino, acyl C₁₋₆,carboalcoxi C₁₋₆,1. Asphalt c83217c831832626；C₁₋₆ alkylsulfonyl,trialkylsilyl C₁₋₆ or dialkyl phosphonyl C₁₋₆ or R¹ and R² taken in conjunction with N represent a saturated ring of 5 or 6 members； and Ar represents a polysubstituted aryl group selected from a group consisting of a) a residue of formula (2),where W¹ represents halogen； X¹ represents F, Cl, C₁₋₄ alkyl,C₁₋₄ alkoxy,Cilt alkylthio,C83218c83318248a asphalt；C₁₋₄ alkylsulfonyl,C₁₋₄ haloalkyl,hello Coxi C₁₋₄,C₁₋₄ alkyl substituted with C₁₋₄ alkoxy,C₁₋₄ alkoxy substituted with C₁₋₄ alkoxy,-CN, -NR³R⁴ or fluorinated acetyl or propionyl； Y¹ represents C₁₋₄ alkyl,C₁₋₄ haloalkyl,halogen or -CN, or, when X¹ and Y¹ are taken together, represents -O (CH₂) ₙO- where n = 1 or 2； and R³ and R⁴ independently represent H or C₁₋₄ alkyl；(b) The remaining formula (3), where W D represents f or Cl； x2 represents F, Cl, - CN, - no.83222；1. Lease of c83218331 and 83242431；C₁₋₄ alkoxy,Cilt alkylthio,C83218c83318248a asphalt；C₁₋₄ alkylsulfonyl,C₁₋₄ haloalkyl,hello Coxi C₁₋₄,C₁₋₄ alkyl substituted with C₁₋₄ alkoxy,C₁₋₄ alkoxy substituted with C₁₋₄ alkoxy,-CN, -NR³R⁴ or fluorinated acetyl or propionyl； Y² represents halogen, C₁₋₄ alkyl,C₁₋₄ haloalkyl,or -CN, or, when 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 C₁₋₆ alkyl；(c) Other formula (4), wherein Y3 represents halogen-cn-o-cf8323；Z3 stands for F, Cl, - CN, - no.8322；1. Lease of c83218331 and 83242431；C₁₋₄ alkoxy,Cilt alkylthio,C83218c83318248a asphalt；C₁₋₄ alkylsulfonyl,C₁₋₄ haloalkyl,hello Co
