Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.
Staff Background Paper # 5.1
Number of OPs: Of the 39 registered organophosphate pesticides, 37 are insecticides and 2 (bensulide and tribufos) are herbicides. There are an additional 8 OPs that have been canceled, but still have tolerances on the books (import tolerances).
OPs Relative to All Pesticides: Organophosphate pesticides account for 8% of the total pesticide use in the U.S. (in terms of pounds of active ingredient)
OPs Relative to Other Insecticides: Organophosphate insecticides account for approximately 50% of the total insecticide-treated acres in the U.S. and about 65% of the pounds of insecticide active ingredient applied to agricultural settings.
OP Agricultural Usage: 60 million lbs. of OPs are applied to 38 million acres of agricultural crops in the U.S. annually (about 10% of the total area of agricultural crops in the U.S.). Each acre is treated an average of 1.6 times. The agricultural use sites are as follows:
million lbs. applied
field corn 19
other field crops 10
fruits and nuts 9
OP Non-Agricultural Usage: 17 million pounds are applied to non-agricultural sites:
million lbs. applied
termiticide applications 4
livestock and pets 4
mosquito control & noncrop 3
residential & commercial indoor 3
grain storage facilities 2
turf and ornamental 1
Most Used OPs: 5 OPs (chlorpyrifos, terbufos, profenofos, tribufos, and malathion) account for 60% of all OPs applied (lbs of active ingredient basis).
OP Tolerances: OP tolerances account for 14% of the total number of tolerances established.
Residential Use: 17 OPs are registered for residential uses (applied in or around residential settings, including home pest control, lawns, gardens, and mosquito control), accounting for approximately 10% of the OPs used annually, or a total of almost 8 million pounds.
Public Health Use: 22 OPs are registered for public health uses (e.g., mosquito control and control of other disease-spreading pests).
Why OPs? OPs are popular because they: are inexpensive, have broad-spectrum pest control, are registered on many crops, are very effective, and generally have not developed resistance problems.
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updated May 22, 1998