  In supersymmetric theories with R-parity breaking, sleptons can be produced
in quark-antiquark annihilation at the Tevatron through interactions in which
two quark fields are coupled to a slepton field. If at the same time trilinear
slepton-lepton-lepton couplings are present, the sleptons can be searched for
as resonances in $p\bar{p}\to \tilde{\nu} \to l^+l^-$ and $\tilde{\tau}\to l\nu
$ final states. Existing Tevatron data can be exploited to derive bounds on the
Yukawa couplings of sleptons to quark and lepton pairs. Similar bounds can also
be obtained from $e^+e^-$ annihilation to hadrons at LEP2.
