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The control of powdery mildews on melon, cantaloupe, squash, pea and strawberry was attempted by the application of a formulation developed from a methionine-riboflavin mixture reported to be photodynamically biocidal. The applied formulation consisted of riboflavin (26.62 μM), d,l-methionine (1 mM), copper sulfate (1 mM) and sodium dodecyl sulfate (1000 μg/ml -1 ). In greenhouse as well...