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A. F. Murant A. T. Jones Agricultural aldicarb aphids assessed Association B. D. Harrison b.sc Biology Boag Botrytis Brassica bulbs calabrese cane carotovora carrot components crops cultivars damage decreased developed disease effect elongatus emergence experiments field bean flowers foveata fungicide fungus gangrene germination glasshouse Glen Clova growth haulm Horticultural Research Institute hybrid increased infected inoculated isolates July kg/ha larvae leaf lesions Longidorus Malling Jewel mechanical harvesting midge moisture mosaic virus narcissus nematicides nematodes obtained oospores oxamyl P. D. Waister pathogens ph.d Phoma exigua Plant Breeding plots potato potato cyst nematode primocanes produced progenies protein protoplasts R. A. Fox raspberry ringspot Rubus samples Scotland Scottish Horticultural Research Section seed seedlings SHRI soft fruit soil sowing sown species sprays stem strawberry T. W. Hegarty t/ha temperature tests tobacco rattle virus treatments trichodorid Trudgill tubers twin-scales untreated vectors vegetables vigour Virology virus particles viruses weed yield