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Scenario 3 - Lawn Weeds - Consumer, 1990
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 3,771 3,446 7,217 0.61 11,909 55%
Dicamba 163 345 508 0.05 10,160 47%
MCPP 1,508 1,969 3,477 0.35 9,934 46%
Pendimethalin 4,949 350 5,299 1.50 3,533 16%
Dacthal 1,173 689 1,862 1.00 1,862 9%
Benefin 1,173 788 1,961 1.50 1,307 6%
Other 1,509 1,477 2,986 1.00 2,986 14%
          21,597  
  1. Kline (Hodge and Rafter, 1992a). The numbers presented here reflect a 25% reduction in the pounds of 2,4-D, MCPP, and dicamba applied to lawns in fertilizer/herbicide combinations. We further reduced the pounds of dicamba to reflect its ratio of use with MCPP and 2,4-D in formulations. We added these pounds to pendimethalin. These changes were based on judgment.
  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 (21,598,000), 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.