3-methoxy, thio and amino-4-amino-6-pic (substitute) acids containing a halogen substitutedi- tri- and tetra-substituted at position 6, and their acid derivatives, are herbicides that show a broad spectrum of weed control. Claim 1: A compound of the formula (1) wherein Q represents C₁₋₄ alkoxy,C₁₋₄ haloalkoxy,SRO,O Nr.2；X represents H or halogen； Y represents F, Cl, C₁₋₆ alkyl,C₁₋₆ haloalkyl,C₂₋₆ alkenyl,C₂₋₆ haloalkenyl,C₃₋₇ cycloalkyl,C₃₋₇ or Ar halocycloalkyl； Ar represents a phenyl group or a pyridine substituted with one to four substituents independently selected from halogen, nitro, cyano, formyl, C₁₋₆ alkyl,C₃₋₇ cycloalkyl,C₂₋₆ alkenyl,1. C 83228331 asphalt；C₁₋₆ alkoxy,C₂₋₄ alkoxyalkyl,C₂₋₆ alkylcarbonyl,1. C8332121 asphalt；C₁₋₆ alkylsulfinyl,C₁₋₆ alkylsulfonyl,C₂₋₄ alkenyloxy,1. Asphalt c832222；alkenylthio C₂₋₄,Cin alkynylthio,C₁₋₆ haloalkyl,Halogenated ring 12C₂₋₆ haloalkenyl,C₁₋₆ haloalkynyl,C₁₋₆ haloalkoxy,C₂₋₄ haloalkoxyalkyl,C₂₋₆ haloalkylcarbonyl,a. Halogenated tar c833218331c832626；1. Halogen glycol c83216c83183226；Cqu trialkylsilyl,C₂₋₄ haloalkenyloxy,C₂₋₄ haloalkyloxy,haloalkenyl C₂₋₄,haloalkylthio C₂₋₄,-OCH₂CH₂-,-OCH₂CH₂CH₂-,-8.8322 is-OCH₂CH₂O-,-C (O) OR-C (O) NR R-CR⁴NOR³,-NH832222,-R83088；-No. 830808-8308； so8322； 3,-8308； C (o) R3,-NR⁴C (O) OR³,-NR C (O) NR R o -NCR NR RR¹ and R² independently represent H, C₁₋₆ alkyl,or acyl C₁₋₆；R³ represents C₁₋₄ alkyl or C₁₋₄ haloalkyl；and R⁴ represents H, C₁₋₄ alkyl or C₁₋₄ haloalkyl；o. About a group of methylacetic acid,An agricultural acceptable derivative.Los ácidos 3-alcoxi, tioalquilo y amino-4-amino-6-picolínicos (sustituidos) que poseen un sustituyente halógeno, alquilo o arilo mono-, di- tri- y tetra-sustituido en la posición 6, y sus derivados ácidos, son herbicidas que muestran un amplio espectro de control de malezas. Reivindicación 1: Un compuesto de la fórmula (1) en donde Q representa alcoxi C₁₋₄, haloalcoxi C₁₋₄, SR³, o NR¹R²； X representa H o halógeno； Y representa F, Cl, alquilo C₁₋₆, halo
