Phase Out Planned For One Of Top Five U.S. Pesticides, Plant Doctors Respond

ST. PAUL, Minn., Feb. 17, 1998--The EPA, acting under the Clean Air Act, will be phasing out methyl bromide in just three years, with all U.S. production and importation ending on January 1, 2001. Considerable research indicates methyl bromide a fumigant against weeds, insects, nematodes and microorganisms is a potent ozone depletor. The phase out leaves the agricultural industry in a transitional situation, looking for alternatives.

In response, plant pathologists are hard at work testing new management practices for disease control, especially in tomatoes and strawberries. "The phase out of methyl bromide in the U.S. has stimulated a great deal of creative research," says Jean Beagle Ristaino, associate professor of plant pathology at North Carolina State University and member of the American Phytopathological Society (APS). Her research has led to improvements in the management of soilborne plant pathogens by encouraging the use of ecologically-based strategies.

Use of practices that are less dependent on single-chemical strategies and more biologically and culturally focused may lead to long-term success. Promising tactics include:

  • The use of other fumigants (methyl iodide has some promise and has not been implicated as an ozone depletor)
  • Development of plant varieties resistant to diseases methyl bromide prevented
  • Changes of cultural practices that increase the organic matter level of soil
  • Soil solarization (the thermal heating of moist soil by sunlight)
  • Electrical heating of soil
  • Incorporation of biological control organisms

What ever the alternative, "The loss of methyl bromide certainly presents a significant challenge to American agriculture," says Bill Thomas, EPA. "Currently some 75% of the methyl bromide used in the U.S. is applied to soils prior to planting, and another 11% is used on commodities to control pests after harvest. Without the good work agricultural scientists, like plant patholog

Contact: Cindy Ash, Director of Scientific Services
American Phytopathological Society

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