  We discuss the one-loop virtual-sparticle corrections to QCD jet cross
sections at large $E_T$ and large dijet invariant masses, with reference to
present Tevatron and future LHC collider experiments. We find characteristic
peaks and dips in the sparticle threshold region, due to interferences with
tree-level QCD diagrams. Their magnitudes may be several per cent of the total
jet cross section, so they might provide a useful search tool that is
complementary to the usual missing-energy signature for supersymmetry.
