  I discuss the production of leptoquarks in $p\bar{p}$ collisions at the
Fermilab Tevatron. Evaluated on the basis of a recent next-to-leading order
calculation, the combined D0 and CDF leptoquark searches lead to a
parameter-free lower mass bound of about $\ms \simgt 240$ GeV for scalar
leptoquarks or squarks decaying solely to a first generation charged lepton
plus quark. These results provide very stringent constraints on any explanation
of the recently observed HERA excess events in terms of new particle
production.

High Energy Physics - Phenomenology