| Chemical Abstract Number (CAS #) |
10453868
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| Synonyms | Resmethrin |
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Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-,
[5-(phenylmethyl)-3-furanyl]methyl ester | 5-Benzylfurfuryl chrysanthemate |
| Analytical Method |
EPA Method 616 |
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| Molecular Formula | C22H26O3 |
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| Use | POTENT CONTACT INSECTICIDE EFFECTIVE AGAINST A WIDE RANGE OF
INSECTS.
HIGHLY ACTIVE INSECTICIDE RECOMMENDED FOR USE AGAINST
HOUSEFLIES, GERMAN COCKROACHES.
APPLIED ON INSECTS FOUND IN HOUSEHOLD, GREENHOUSE, INDOOR
LANDSCAPING, MUSHROOM HOUSES, INDUSTRIAL, STORED PRODUCT,
MOSQUITO & INSECT CONTROL.
PET SPRAYS, PET SHAMPOO, AND APPLICATION ON HORSES AND HORSE
STABLES.
CLEARED FOR USE IN AEROSOLS, AQUEOUS PRESSURIZED SPRAYS,
EMULSIFIABLE CONCENTRATES, TRANSPARENT EMULSIONS, & OIL BASE LIQ,
INCL ULV CLEARED FOR FABRIC PROTECTION.
Resmethrin (2%) has replaced Pyrethrum-DDT formulation in aircraft disinfection.
Control on wood lice
Used as a household and garden insecticide (especially for control of glasshouse whiteflies and
aphids), and in agricultural premises.
Resmethrin is currently used for mosquito control (by aerial application) in the USA, and it can
also be used for the control of white fly in greenhouses.
Resmethrin is mainly used in aerosol formulations, but also in oil formulations and emulsifiable
concentrates, for the control of household and public health insects. It is also used in combination
with other insecticides (e.g., tetramethrin, malathion).
Insecticide Pyrethrins
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| Apparent Color | WAXY OFF-WHITE TO TAN SOLID; Colorless crystals
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| Odor | CHRYSANTHEMATE ODOR
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| Boiling Point | 180 deg C @ 0.01 mm Hg
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| Melting Point | 43-48 deg C
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| Molecular Weight | 338.48
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| Density | 0.958-0.968 @ 20 deg C
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| Sensitivity Data | Immediately irritating to the eye. Pyrethrins
The chief effect from exposure is skin rash particularly on moist areas of the skin. May
irritate the eyes.
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| Environmental Impact | Resmethrin's use as a contact insecticide releases the compound directly to the
environment through applications in sprays and other application routes. If released to the
atmosphere, resmethrin will degrade rapidly in the vapor phase by reaction with ozone and
photochemically produced hydroxyl radicals (estimated half-life of 25 min). Particulate phase
resmethrin will be removed physically from air by wet and dry deposition. If released to soil or
water, resmethrin can degrade readily through biodegradation, hydrolysis and photodegradation.
The photodegradation half-life in sunlight (at the water's surface or as a thin-film on dry surfaces)
can be as fast as several hrs or less. Aqueous hydrolysis is expected to become important only in
alkaline media (pH > 8). Resmethrin's high log Koc value (estimated as log 4.7-5.6) suggests that
it will not leach in soil and that it will partition to sediment from water in aquatic ecosystems.
Occupational exposure to resmethrin occurs through dermal contact and inhalation of dust,
especially to workers applying the compound as an insecticide. Household use of
resmethrin-containing pesticides will expose the general population through inhalation and dermal
contact
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| Environmental Fate | TERRESTRIAL FATE: Resmethrin is expected to degrade in soil through aqueous
hydrolysis and biodegradation. Rapid photodegradation will occur on surfaces exposed to
sunlight. The second-order aqueous hydrolysis half-lives of resmethrin have been estimated to be
1.3 yrs, 47 days and 4.7 days at pH 7, 8 and 9, respectively, at 25 deg C(1,SRC) which indicate
that hydrolysis will be important in moist alkaline soils (pH > 8). Although environmental
biodegradation data specific to resmethrin is not available, the pyrethroid class of insecticides ise
readily degraded by environmental microorganisms ; based upon its structure, resmethrin are
also expected to readily biodegrade. Photodegradation studies have shown that surface
applications of resmethrin degrade readily (half-life of several hours or less) with exposure to
sunlight or sunlamps(3-4). Resmethrin's estimated log Koc value of 4.7-5.6(5-6,SRC) suggests
that resmethrin will not leach in soil.
AQUATIC FATE: Resmethrin can degrade in natural water through photodegradation,
hydrolysis and biodegradation. The predicted near-surface half-life for the photo-oxidation of
resmethrin exposed to sunlight in natural water has been reported as 0.2 hr . The second-order
aqueous hydrolysis half-lives of resmethrin have been estimated to be 1.3 yrs, 47 days and 4.7
days at pH 7, 8 and 9, respectively, at 25 deg C(2,SRC) which indicate that hydrolysis will be
important only in alkaline waters (pH > 8). Although environmental biodegradation data
specific to resmethrin is not available, the pyrethroid class of insecticides is readily degraded by
environmental microorganisms ; based upon its structure, resmethrin is also expected to readily
biodegrade. Resmethrin's estimated log Koc value of 4.7-5.6(4-5,SRC) suggests that
resmethrin will partition from the water column to sediment and suspended matter.
ATMOSPHERIC FATE: Based upon a reported vapor pressure of 1.13X10-8 mm Hg at 30 deg
C , resmethrin 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 ozone and
photochemically produced hydroxyl radicals with a combined estimated half-life of about 25
min(3-4,SRC). Particulate phase resmethrin and aerosols released to air during spray applications
of resmethrin insecticide will be removed from air physically by dry and wet deposition.
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