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39th N.Z. Weed activity adult aphid application asparagus assessed block caused chemicals clopyralid compared counts cover crop damage density DISCUSSION disease effect eggs emergence establishment experiments field formulation four fruit fungicides gave glyphosate gorse grass grass grub ground growth harvest height herbicide higher important increased indicated infested insect insecticide kg ai/ha kill larvae leaf leaves less levels lower lucerne March Mean measured METHODS months mortality numbers observed occurred P.O. Box pasture period Pest Control Conf plants plots population present Private Proc production pupae ragwort range rates reduced REFERENCES replicates reported Research residues root rows ryegrass samples scale season seed seedlings showed significant significantly similar soil spears species spray spring stage stem Table tested thistle treated treatments trees trials untreated vines Weed and Pest weed control weeks weevil whitefly yield Zealand