General
Information
- Cyfluthrin is a
relatively new insecticide that is classified as a synthetic
pyrethroid because its chemical structure is a synthetic analog
of
naturally-occurring pyrethrins.
- Cyfluthrin is a
clear liquid, dark amber in color, with an oily to pasty
consistency, and has a faint aromatic solvent odor at room
temperature.
- Cyfluthrin is a
skin and eye irritant in humans, but overall poisonings from
pyrethroid chemicals are rare.
Process
- The concentrations
of cyfluthrin decreased rapidly, with maximum levels between 4
hours to 1 day post application in artificial ponds.
- Cyfluthrin
degrades abiotically through hydrolysis.
- Cyfluthrin is
hydrophobic and has a high KOC. Consequently cyfluthrin has a
low tendency to leach in soil. In addition, cyfluthrin mobility
during runoff events will be low, except under conditions of
high sediment transport.
- Cyfluthrin is
sensitive to breakdown by sunlight.
Technology
- A
spectrophotmetric method standardized to quantify cyfluthrin in
methanol extracts of soil samples revealed an absorption maximum
at 230 nm.
- An encapsulated
formulation of cyfluthrin [60 mg/ml, 0.5 lb/gallon (a.i)] was
obtained from Whitmire (St Louis, MO, U.S.A.), and refrigerated
for about 5 months at 48C.
- Cyfluthrin in
water is extracted with hexane. After concentrating, the sample
is redissolved in hexane and analyzed by gas chromatography
using an electron capture detector (ECD).
- The GC-MS/MS
multi-residue method is suitable for monitoring pesticides in
fruit preserves at the regulatory levels compliant with the EU
DG SANCO criteria for pesticides.
Report
- The occurrence of
cyfluthrin or its metabolites in rotational crops was also
investigated. According to the RMS, EFSA(European Food Safety
Authority) concludes that residues of cyfluthrin are not
expected in rotational and/or succeeding crops provided that the
active substance is applied according to the intended GAPs and a
plant back interval of at least 38 days is respected for
cereals.
- In California,
where pesticide use reporting is more comprehensive than in
other states, the amount used in agriculture is much smaller
than that used for other purposes.However, agricultural uses are
significant: about 10 percent of the U.S. cotton acreage (over a
million acres) is treated with cyfluthrin, as is about 60
percent of the U.S. pear acreage.
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