Effect of a molluscicide and an insecticide on the establishment of direct-drilled ryegrass, tall fescue and phalaris

Abstract

The effect of a molluscicide or an insecticide on the establishment, by direct drilling of 'Grasslands Roa' tall fescue (Festuca arundinacea Schreb.) 'Ellett' perennial ryegrass (Lolium perenne L), and 'Grasslands Maru' phalaris (Phalaris aquatica L.) was measured in spring and autumn establishment over 2 years. In autumn after a wet summer the application of a molluscicide significantly increased seedling numbers and establishment yield for ryegrass and tall fescue. A molluscicide applied in autumn after a dry summer or in spring had no effect . Application of insecticide significantly improved the establishment of ryegrass and tall fescue in only one of the two springs and had no effect in autumn. Phalaris was the least responsive of the pasture species to either an insecticide or molluscicide. These differences observed at establishment resulting from the applications of a pesticide were not apparent in an assessment made 1 year later. For tall fescue the results recorded on seedling numbers and yield of sown species at establishment and 1 year would suggest that for this species establishment by direct drilling is not recommended. Keywords pasture establishment, 'Grasslands Roa' tall fescue, 'Ellett' ryegrass, 'Grasslands Maru' phalaris, direct drilling, molluscicide, insecticide