|Use|| Contact and systemic insecticide. Effective against alfalfa looper, aphids, armyworms,
bagworms, bean leafbeetle, bean leafroller, blackgrass bugs, bollworm, budworm, cabbage looper,
cankerworms, corn earworm, cutworms, diamond back moth, European corn borer, fireworms,
fleahooper, grasshoppers, green cloverworm, gypsy moth, hornworm, imported cabbage worm,
imported fire ants, lace bugs, leafminers, leafhoppers, leafrollers, lygus, Mexican bean beetle,
Mormon crickets, oak moth, saltmarsh caterpillar, soybean looper, spanworms, sparganothis,
stinkbugs, tent caterpillars, three-cornered alfalfa hopper, thrips, tobacco hornworm, velvetbean
caterpillar, webworms, and whitefly. For bell and non-bell peppers, Brussel sprouts, cauliflower,
celery, cotton, cranberries, dry beans, head lettuce, mint, peanuts, soybeans, and succulent beans.
Cockroach control (spot treatment only) in residential and industrial buildings and insect control
in forests, tobacco, and on ornamentals.
Acephate is used to control insects and aphids in ornamentals, where it has a reasonably broad
spectrum. It is also cleared for use on beans, cotton, head lettuce, celery, soybeans, and bell
peppers. It controls parasites of cattle, goats, hogs, horses, poultry, and sheep, where tolerances
have been set for milk, eggs, fat, and meat.
Acephate is used for household use or golf course spray. From table
|Environmental Fate|| TERRESTRIAL FATE: Laboratory degradation studies have demonstrated that
acephate can degrade through microbial degradation and aqueous hydrolysis . Since the rate of
hydrolysis increases with increasing pH , degradation may occur more rapidly in alkaline soil
than in acidic soil. A review of available literature determined that the average soil half-life of
acephate is about 3 days . A laboratory study of rice paddy soil found a half-life of 3-4 days in
aerobic conditions and 13-14 days in anaerobic (flooded) conditions suggesting a longer
persistence in anaerobic conditions. The persistence half-life on a variety of foliage is reported to
range from 0.7 to 8.2 days . Estimated Koc values of 2-8 suggest that acephate will leach
AQUATIC FATE: Laboratory degradation studies have demonstrated that acephate can degrade
through microbial degradation and aqueous hydrolysis . Since the rate of hydrolysis increases
with increasing pH , degradation will occur more rapidly in alkaline water than in acidic water.
DMPT (O,S-dimethyl phosphorothiolate) has been identified as the major hydrolysis product ;
methamidophos and OMPT (O-methylacetyl phosphoramidothiolate) have been identified as
minor hydrolysis products . Aquatic volatilization, bioconcentration, direct photolysis and
adsorption to sediment are not expected to be important environmental fate processes.
ATMOSPHERIC FATE: Based upon a vapor pressure of 1.7X10-6 mm Hg at 25 deg C ,
acephate can exist in both the vapor and particulate-phases in the ambient atmosphere(2,SRC). It
will degrade rapidly in the vapor-phase by reaction with photochemically produced hydroxyl
radicals with an estimated half-life of 6 hr(3,SRC). Acephate is very soluble in water , therefore,
physical removal from air by wet deposition (dissolution in clouds, rainfall, etc) is possible.
Physical removal of particulates by dry deposition (settling) will also occur.
TERRESTRIAL FATE - Acephate if rapidly degraded in soil, with a half-life of 0.5-4 days for
most soil types and 6-13 days in organic muck.
EFFL: An acephate concn of 134 mg/L was detected in the rinsate effluent from washing
(rinsing) an airplane tank used to hold the insecticide during s|