Contamination and effects in freshwater ditches resulting from an aerial application of cypermethrin
Cypermethrin (Ripcord) was applied at 25 g ai ha-1 by fixed-wing aircraft to a large field (11.6 ha) of winter wheat bordered on three sides by drainage ditches. About 60% of the nominal application rate was deposited on the crop and about 6% (maximum) was deposited over the water surface. The amount of spray drift deposited upwind declined sharply with increasing distance from the treated field. Downwind, the spray drift was small but occurred over a much greater distance. Very low (0.03 micrograms liter-1 maximum) concentrations of cypermethrin were found in subsurface water samples and these declined rapidly after spraying. Bioassay tests, using a sensitive indicator species, confirmed that only a small amount of cypermethrin contamination had occurred in the ditch adjacent to the downwind perimeter of the field. Frequent sampling of the zooplankton and macroinvertebrate fauna of the ditches indicated that there were no marked biological effects resulting from the cypermethrin application. Only a few air-breathing corixids and the highly susceptible water mites showed minor short-term reductions in abundance after spraying. No effects were observed on either caged or indigenous fish stocks and no significant residues of cypermethrin were found in fish tissues.
- Research Organization:
- Shell Research Limited, England
- OSTI ID:
- 5267986
- Journal Information:
- Ecotoxicol. Environ. Saf.; (United States), Vol. 2
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
FRESH WATER
CONTAMINATION
PESTICIDES
BIOLOGICAL EFFECTS
ENVIRONMENTAL EFFECTS
ZOOPLANKTON
POPULATION DYNAMICS
AIRCRAFT
CHLOROPHYLL
DRAINAGE
ELECTRIC CONDUCTIVITY
FISHES
OXYGEN
ANIMALS
AQUATIC ORGANISMS
CARBOXYLIC ACIDS
ELECTRICAL PROPERTIES
ELEMENTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYTOCHROMES
PIGMENTS
PLANKTON
PORPHYRINS
VERTEBRATES
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
560304 - Chemicals Metabolism & Toxicology- Invertebrates- (-1987)
560305 - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)