Methionine-Riboflavin Mixtures with Surfactants and Metal Ions Reduce Powdery Mildew Infection in Strawberry Plants

in Journal of the American Society for Horticultural Science
View More View Less
  • 1 U.S. Department of Agriculture-Agricultural Research Service, Fruit Laboratory, Beltsville Agricultural Research Center, Beltsville, MD 20705
  • 2 Department of Plant Pathology, National Chung Hsing University, Taichung 40227, Taiwan, Republic of China

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 `Earliglow' strawberry (Fragaria × 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.

If the inline PDF is not rendering correctly, you can download the PDF file here.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 150 72 4
PDF Downloads 192 116 19