The use of MR formulation as a novel and environmentally safe photodynamic fungicide for the control of powdery mildews
1996
Tzeng, D.D.S. | Tzeng, H.C. | Chen, R.S. | Cheng, A.H. | Tsai, C.C. | Chen, C.W. | Hwang, T.C. | Yeh, Y. | DeVay, J.E.
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 micromolar), D,L-methionine (1 mM), copper sulfate (1 mM) and sodium dodecyl sulfate (1000 micrograms/ml-1). In greenhouse as well as field trials, disease control efficacy of the test formulation was equivalent or superior to commercially available chemicals. Upon application, mildew colonies were generally eradicated. A weekly application was sufficient in controlling the disease as effectively as most conventional fungicides. The observed morphological destructive effects suggested an eradicating activity of the formulation. The overall performance of disease control efficacy among the test crop species clearly demonstrated the usefulness of the formulation as an alternative fungicide for the control of powdery mildews on various greenhouse as well as field crops. The formulation is unique, because it contains mainly food constituents and biodegradable ingredients.
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