Ground deposition impact of aerially applied fenthion on the fiddler crabs, Uca pugilator.

J Am Mosq Control Assoc

John A. Mulrennan, Sr., Public Health Entomology Research and Education Center, Florida A&M University, 4000 Frankford Avenue, Panama City, FL 32405, USA.

Published: March 2003

Caged fiddler crabs, Uca pugilator, were exposed to field ULV applications to measure the impact of fenthion. Two nozzle systems, conventional flat-fan nozzles (Tee Jet 8002SS) and high-pressure hydraulic nozzles (1/8 MIS), were compared using single spray swaths. Fenthion residues were detected throughout the 4.83-km test zone for both systems. Heavy ground deposits (650-1,670 microg/m2) of fenthion were found within 1 km using the flat-fan nozzle systems, which resulted in 80% fiddler crab mortality. Less than 100 microg/m2 fenthion ground deposits were detected during the high-pressure nozzle trials. No fiddler crab mortality was observed within the first 1-km zone following 3 single swath applications repeated during 3 consecutive nights. We found also that when the fiddler crabs were exposed to 700-800 microg/m2 fenthion, mortality occurred. Significant crab mortality (>50%) was observed when residues exceeded 1,000 microg/m2.

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