164
Carl E. Crisp
1974, approximately 20.4 million pounds of pesticides was used, equivalent to
0.68 million pounds per year. From 1974 to 1977, insecticides totaled 5.1 million
pounds or the equivalent of 1.7 million pounds per year (Tables 7.1 and 7.2).
Insecticide use patterns as a function of total pounds used (Table 7.2) should
be interpreted cautiously. The values reported are predominantly from largescale uses but include insecticides reported on experimental-use permits. Carbaryl
is the only insecticide that is registered with EPA for control of the four major
Table 7.2. Insecticides Used by the
Forest Service, U.S. Department of
Agriculture, in Forest Insect Control
Programs, 1975-1977, by Pounds
Used
Insecticide
Pounds used
Carbaryl
4,180,878
Fenitrothion
387,851
Trichlorfon
270,074
Malathion
82,912
Acephate
38,036
DDT"
37,202
Mexacarbate
35,688
Crotoxyphos
19,576
Azinphosmethyl
8,633
Carbofuran
6,485
Lindane
5,677
Mirex
3,936
BHC
3,296
Dichlorphos
2,420
Dimethoate
1,766
Aminocarb
1,332
Chlordane
877
Disulfoton
855
Dimilin
592
Disyston
525
Toxaphene
500
Diazinon
394
Methomyl
263
Phorate
134
Tetrachlorvinphos
134
Chlorpyrifos
116
Pyrethrins
114
Dieldrin
50
Oxydemetonmethyl
50
ChIorpyrifos methyl
44
Dicofol
42
Methoxychlor
35
a Used to control plague fleas, a use pennitted by law.