  A very light gluino ($m_{\tilde g} \lsim 2 \gev$) is still consistent with
experimental data and is attractive from a theoretical standpoint. This has
been shown to lead to a small gluino content of the proton. We use this effect
to demonstrate that such a light gluino could lead to a striking enhancement,
at Tevatron, of monojets accompanied by large missing momentum. A reanalysis of
the existing data may thus rule out a light gluino for a common squark mass of
upto $\sim 600 \gev$.
