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Carbaryl washoff from soybean plants

G H Willis1, S Smith, L L McDowell

  • 1U.S. Department of Agriculture, ARS, Soil and Water Research Unit, 4115 Gourrier Avenue, Baton Rouge, Louisiana 70808-4499, USA.

Archives of Environmental Contamination and Toxicology
|August 1, 1996
PubMed
Summary

Rainfall significantly impacts pesticide effectiveness. This study found that while 67% of carbaryl washed off soybean plants, higher rainfall intensity led to lower concentrations in runoff, suggesting improved rainfastness.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Pesticide Science

Background:

  • Weather variables, particularly rainfall, significantly influence the efficacy and persistence of foliar-applied pesticides.
  • Understanding pesticide wash-off is crucial for predicting environmental fate and agricultural effectiveness.

Purpose of the Study:

  • To investigate the impact of rainfall intensity and amount on carbaryl (Sevin(R) XLS Plus) wash-off from soybean plants.
  • To compare the rainfastness of carbaryl on soybeans under simulated rainfall conditions.

Main Methods:

  • Utilized a multiple-intensity rainfall simulator to apply 25 mm of rain at varying intensities (13.0–105.1 mm/h) to soybean plants treated with carbaryl.
  • Quantified carbaryl concentrations in the runoff (wash-off) from the plants.

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Main Results:

  • Approximately 67% of applied carbaryl was washed off by 25 mm of rain.
  • Higher rainfall intensities resulted in lower carbaryl concentrations in the wash-off.
  • Rainfall amount demonstrated a more significant impact on carbaryl concentrations than rainfall intensity.

Conclusions:

  • Carbaryl exhibited improved rainfastness on soybean plants compared to previous studies with other formulations on cotton.
  • Rainfall amount is a more critical factor than intensity in determining carbaryl wash-off concentrations.
  • Findings contribute to understanding pesticide behavior under diverse weather conditions.