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39th N.Z. Weed adult alachlor aphid application asparagus assessed atrazine benomyl BYDV Californian thistle captafol chemicals chlorpyrifos clopyralid cover crawlers crop damage density diazinon diflubenzuron disease DSIR effect eggs fensulfothion field foliage fruit fungicides germination glyphosate Goldson gorse grass grub Grasslands greedy scale growers growth harvest herbicide hexazinone increased infested insect insecticide instars kg ai/ha kg/ha kiwifruit larvae leaf levels litres litres/ha lucerne lucerne flea metalaxyl metsulfuron mg ai/litre miticides mortality nematodes nitrogen numbers P.O. Box Palmerston North paraquat parasite pasture pathogens Pest Control Conf pesticide plants plots population Proc prochloraz ragwort rates reduced regrowth replicates Research residues Roller root Ruakura ryegrass samples season seed treatments seedlings significant significantly Silwet Sitona soil spears species spray sprayer stem weevil Table tall fescue tamarillo tested thrips trees trials trifluralin untreated control vines Weed and Pest weed control weeks whitefly yield Zealand