Novel bicyclic triazole compounds of the formula I have an excellent herbicidal and plant-growth regulating action. The compounds correspond to the formula I IMAGE (I) wherein Q is hydrogen or halogen, T is halogen, and Z is a radical -XR or -COXR, in which X is oxygen, sulfur or a radical -NR1-, R is hydrogen, a C1-C6-alkyl, C3-C6-cycloalkyl, C3-C6-alkenyl or C3-C6-alkynyl radical, which is unsubstituted or substituted by halogen, or is a radical -A-COXR1, in which A is a C1-C4-alkylene bridge and R1 is hydrogen or C1-C4-alkyl, C3-C6-cycloalkyl, C3-C4-alkenyl or C3-C4-alkynyl.
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