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N-[2-(2-Oxo-1-Imidazolidinyl) Ethyl]--Phenylurea as a Protectant Against Ozone Injury to Laboratory Fumigated Pinto Bean Plants. T. Craig Weidensaul, Head, Laboratory for Environmental Studies, and professor of plant pathology, Ohio Agricultural Research and Development Center, Wooster, 44691; Phytopathology 70:42-45. Accepted for publication 23 July 1979. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-42.

The protective capacity of N-[2-(2-oxo-1-imidazolidinyl) ethyl]--phenylurea against ozone (O3) injury to pinto bean plants was evaluated. This experimental compound, known as ethylene diurea (EDU), was applied as a foliar spray 1, 3, 7, or 10 days before a 6-hr fumigation with 0, 200, 500, 800, 1,000, or 1,500 μg of O3 per cubic meter. EDU levels were 0, 500, 1,000, or 5,000 μg/g in water with 0.05 or 0.10% Triton X-100. EDU gave better protection when applications were larger. Treating plants 3 to 7 days before O3 exposure gave best protection. EDU treatments were most effective in protecting plants exposed to O3 levels of 800 μg/m3 or more. EDU did not protect foliage that had not yet formed when the chemical was applied.