Verslag van interactie nematiciden-insekticiden proefvelden 1980-1983 = Report on trialfields on the interaction of herbicides and insecticides 1980-1983 / J.D.A. Wevers and M.J.M. KerstensAtrazinschade bij bieten geteeld na maïs = Damage of atrazin in sugar beet grown after maize / J.D.A. Wevers and L. Elands