Methionine-riboflavin mixtures with surfactants and metal ions reduce powdery mildew infection in strawberry plants

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Abstract

Foliar application of a mixture of methionine (1 mM) and riboflavin (26.6 μM) reduced the severity of powdery mildew [Sphaerotheca macularia (Wallr. ex Fr.) Jacz. f. sp. fragariae] infection in 'Earligiow' strawberry (Fragaria x ananassa Duch.) plants. Efficacy of this mixture on controlling powdery mildew infection was enhanced by supplements of copper, iron, and surfactants [sodium dodecyl sulfate (SDS), Triton X-100, Tween-20, or oxyalkylenemethylsiloxane (Silwet L-77)]. Free-radical scavengers (n-propyl gallate, thiourea) and antioxidants (α-tocopherol, β-carotene) reduced the efficacy of this mixture. Plants treated with a mixture of riboflavin (26.6 μM), D,L-methionine (1 mM), copper sulfate pentahydrate (1 mM), and surfactants (SDS or Silwet L-77 at concentrations of 0.05% to 0.1%) showed a decrease in powdery mildew infection. Results of this study suggest that treatment with a mixture of methionine and riboflavin is beneficial to strawberry plants and may serve as an alternative to fungicides for controlling powdery mildew.

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Wang, S. Y., & Tzeng, D. D. S. (1998). Methionine-riboflavin mixtures with surfactants and metal ions reduce powdery mildew infection in strawberry plants. Journal of the American Society for Horticultural Science, 123(6), 987–991. https://doi.org/10.21273/jashs.123.6.987

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