[ Return to Pesticide-Exposure Matix page ]

Scenario 2 - Lawn Weeds - Consumer, 1980
Method 2, Confidence medium
Active
Ingredient (a)		 Pounds Applied to Lawns
(thousands)		 Application
Rate
(lbs/acre) (b)		 Lawn Acres
Treated
(thousands)
(calculated) (c)		 Probability
(calculated) (d)
Fertilizer/
Herbicide
Combination
Products (a)		 Straight
Herbicide
Products (a)		 Total
(calculated)
2,4-D 1,300 700 2,000 0.61 3,279 57%
MCPP 650 350 1,000 0.35 2,857 50%
Dicamba 0 150 150 0.07 2,143 37%
Dacthal 420 180 600 1.00 600 10%
Bensulide 500 0 500 1.50 333 6%
Siduron 290 0 290 1.00 290 5%
MSMA 0 230 230 1.00 230 4%
Other 780 240 1,020 1.00 1,020 18%
          5,752  
  1. Kline (Anonymous, 1982). The numbers presented here reflect a 49% reduction in the pounds of MCPP applied in straight insecticide products and a 17% reduction in the pounds of MCPP applied in fertilizer/herbicide combination products. We did this to reflect actual formulas and based on our judgment that MCPP volume was overstated relative to 2,4-D in the Kline report.
  2. Meister Publishing Company manuals, C&P Press publications, and U.S. EPA Pesticide Product Label System.
  3. We divided the pounds by the application rate to calculate the number of lawn acres treated with each active ingredient. To calculate the total number of lawn acres treated (5,752,000), we summed across all of the active ingredients except dicamba and MCPP because they are virtually always applied with 2,4-D, while 2,4-D is sometimes applied alone.
  4. Lawn acres treated with each active ingredient divided by total number of lawn acres treated.