Herbicidally active pyridylketosultams of the general formula (I) and their use as herbicides are described.
In this formula (I), X
1
, X
2
, X
3
and X
4
each represent N or C—R
1
. R
1
, R
2
, R
3
and R
4
represent radicals such as hydrogen and organic radicals such as alkyl.