N-[2-(2-Oxo-1-Imidazolidinyl) Ethyl]-N'-Phenylurea as a Protectant Against Ozone Injury to Laboratory Fumigated Pinto Bean Plants

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Abstract
The protective capacity of N-[2-(2-oxo-1-imidazolidinyl)ethyl]-N''-phenylurea against 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 h fumigation with 0, 200,500, 800, 1000 or 1500 .mu.g of O3/m3. EDU levels were 0, 500, 1000 or 5000 .mu./g in water with 0.05 or 0.10% Triton X-100. EDU gave better protection when applications were larger. Treating plants 3-7 days before O3 exposure gave best protection. EDU treatments were most effective in protecting plants exposed to O3 levels of 800 .mu.3 or more. EDU did not protect foliage that had not yet formed when the chemical was applied.