Abstract
SUMMARYIprodione, formulated as granules and placed in the seed furrow, was tested in field plots in Warwickshire for control of white rot (Sclerotium cepivorum Berk.) of spring‐sown salad onions. At 0.25 g iprodione/m row the granules were nearly as effective as seed treatment at 125 g iprodione/kg seed, which reduced infection in 1978 from 88 per cent plants infected to 13 per cent. At 0.063 or 0.125 g iprodione/m row, granules were less effective but gave control similar to that with calomel seed treatment at 500 g/kg, which reduced infection to 46 per cent.In 1979, excellent control was achieved by combining the pre‐planting granule treatment with a later application of iprodione to stem bases. Granules applied at 0.063 g iprodione/m row combined with a single post‐emergence stem‐base application of iprodione at 0.031 g/m row (equivalent to a total rate of 2.8 kg iprodione/ha) gave complete control of the disease.
Published Version
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