  We report on a high-statistics search for the \t1540 resonance in
$\Sigma^-$-nucleus collisions at 340 \gevc1 . No evidence for this resonance
was found in our data sample which contains 13 millions $K^0_s \to \pi^+\pi^- $
decays above background. For the decay channel $\Theta^+ \to K^0_s p$ and the
kinematic range $x_F>$ 0.05 we find the production cross section to be
$BR(\Theta^+ \to K^0_s p)\cdot \sigma_0 <$ 1.8 $\mu$b per nucleon at 99% CL.
