Compounds of the formula in which A is an A radical from the group of (A-b) to (A-f) in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula and B 2 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, X 1 is nitrogen or CH, X 2 is nitrogen or CH, X 3 is nitrogen or CH, where either none or only one of the variables X 1, X 2 and X 3 is nitrogen, R 1 is a B radical from the group of in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula, R 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl and cycloalkenyl, G 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl, cycloalkenyl, halocycloalkenyl, cycloalkylalkyl, cycloalkenylalkyl, halocycloalkenylalkyl and in each case optionally substituted aryl, arylalkyl, pyridyl and pyridylalkyl, and compounds of the formula in which A is the radical (A-a) in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula and G 1 is N or C-B 1, B 1 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, B 2 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, T is oxygen or an electron pair, X 1 is nitrogen or CH, X 2 is nitrogen or CH, X 3 is nitrogen or CH, where either none or only one of the variables X 1, X 2 and X 3 is nitrogen, R 1 is one of the following B radicals: in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula in which R 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl and cycloalkenyl, G 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl, cycloalkenyl, halocycloalkenyl, cycloalkylalkyl, cycloalkenylalkyl, halocycloalkenylalkyl and in each case optionally substituted aryl, arylalkyl, pyridyl and pyridylalkyl. A is an A radical from the group of (A-b) to (A-f) in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula and B 2 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, X 1 is nitrogen or CH, X 2 is nitrogen or CH, X 3 is nitrogen or CH, where either none or only one of the variables X 1, X 2 and X 3 is nitrogen, R 1 is a B radical from the group of in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula, R 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl and cycloalkenyl, G 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl, cycloalkenyl, halocycloalkenyl, cycloalkylalkyl, cycloalkenylalkyl, halocycloalkenylalkyl and in each case optionally substituted aryl, arylalkyl, pyridyl and pyridylalkyl, and compounds of the formula in which A is the radical (A-a) in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula and G 1 is N or C-B 1, B 1 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, B 2 is a radical from the group of hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy and in each case optionally substituted cycloalkyl and cycloalkenyl, T is oxygen or an electron pair, X 1 is nitrogen or CH, X 2 is nitrogen or CH, X 3 is nitrogen or CH, where either none or only one of the variables X 1, X 2 and X 3 is nitrogen, R 1 is one of the following B radicals: in which the broken line denotes the bond to the carbon atom of the bicyclic system of the formula in which R 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl and cycloalkenyl, G 2 is a radical from the group of hydrogen, alkyl, haloalkyl, alkenyl, alkynyl, alkoxyalkyl, alkyl-S-alkyl, alkyl-S -alkyl, alkyl-S 2 -alkyl, cycloalkyl, halocycloalkyl, cycloalkenyl, halocycloalkenyl, cycloalkylalkyl, cycloalkenylalkyl, halocycloalkenylalkyl and in each case optionally substituted aryl, arylalkyl, pyridyl and pyridylalkyl.