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Scenario 4 - Lawn Weeds - Consumer, 2000
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 3,300 4,200 7,500 0.61 12,295 49%
MCPP 1,600 2,420 4,020 0.35 11,486 46%
Pendimethalin 8,120 0 8,120 1.25 6,496 26%
Dicamba 160 210 370 0.05 7,400 30%
Dacthal 1,800 0 1,800 1 1,800 7%
Benefin 1,800 895 2,695 1.5 1,797 7%
Other 2,500 1,200 3,700 1.5 2,467 10%
          24,854  
  1. Kline (Fugate et al., 2002). The numbers presented here for fertilizer/insecticide combinations reflect several changes, based on judgment: a 50% reduction in the pounds of 2,4-D and dicamba, an 82% reduction in the pounds of dicamba (to reflect its ratio of use with MCPP and 2,4-D in formulations), and a 35% increase in the pounds of pendimethalin.
  2. Meister Publishing Company manuals and C&P Press publications
  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 (24,854,000), 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.