P430 Evaluating fate and effects of atrazine and -cyhalothrin in vegetated and unvegetated ditch mesocosms. Bouldin, Jennifer*,1, 1 Arkansas State University, State University, AR, USA

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P432 Toxicity Of Dormant Spray Pesticide Runoff From California Orchards: Ground Covers and Temporal Patterns . Werner, Inge*,1, Deanovic, Linda1, Henderson, John1, Wilson, Barry1, Wallender, Wes1, Krueger, William1, Oliver, Mike1, Zalom, Frank1, 1 University of California Davis, Davis, CA

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P434 Electro-physiological measures of pesticide toxicity to the salmon olfactory system. Sandahl, Jason*,1, Jenkins, Jeffrey1, Warner, Kara1, 1 Oregon State University, Corvallis, OR, USA

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P435 Cholinesterase Inhibition in Larval Bullfrogs Exposed to Malathion and Diazinon Alone and in Mixture. Henry, Kevin*,1, Marable, Brian1, Mayes, Monte2, Woodburn, Kent1, 1 The Dow Chemical Company, Midland, Michigan, USA2 Dow AgroSciences, Indianapolis, IN, USA

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P436 Do Organophosphate and Pyrethroid Insecticides Affect the Neuromuscular Development of Topsmelt? Wilson, Barry1, Fry, William*,1, 1 UC Davis, Davis, CA, USA

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P437 Burrowing behavior in C.riparius following short-term exposure to pesticides. Maycock, Dawn*,1, Morritt, David1, Crane, Mark2, 1 Royal Holloway University of London, Egham, UK2 Crane Consultants, Farringdon, UK

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P438 Effect of herbicides used in rice paddy fields on the growth of freshwater algae. ISHIHARA, SATORU*,1, HORIO, TAKESHI1, KOBARA, YUSO1, ENDO, SHOZO1, UEJI, MASAKO1, 1 National Institute for Agro-Environmental Sciences(Japan), Tsukuba, Ibaraki, Japan

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P439 Relationship Between Uptake Capacity and Differential Toxicity of the Herbicide Atrazine in Selected Microalgal Species. Weiner, Jeannette*,1,2, DeLorenzo, Marie2, Fulton, Michael2, 1 Medical Unviersity of South Carolina, Charleston, SC, US2 NOAA/National Ocean Service/CCEHBR, Charleston, SC, US

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P440 Enzymatic detoxification of organophosphates to Daphnia magna. Tonkopii, Valerii*,1, Zagrebin, Anatoly1, 1 Institute of Limnology,Russian Academy of Scienses, St.Petersburg, Leningradskaya, Russia

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P441 Influences of a laboratory diet and natural seston on the bioavailability of insecticides to black fly larvae in an acute toxicity test. Overmyer, Jay*,1, Noblet, Ray1, 1 University of Georgia, Athens, GA, USA

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P442 Toxicity of several mosquito insecticides to crayfish. Paul, Eric*,1, Simonin, Howard1, Valenti, Theodore1,2, 1 NYSDEC - Aquatic Toxicant Research Unit, Rome, NY, USA2 Virginia Tech - Biology Department, Blacksburg, VA, USA

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P443 Evaluation of Cholinergic Effects and Cummulative Toxic Endpoints. Jones, Frank*,1, 1 Exponent, Albany, NY, USA

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P444 Distribution of choline acetyltransferase (ChAT) in the salmon olfactory system: Implications for mechanisms of pesticide-induced impairment. Jarrard, Hugh*,1, Lee, Rick1, Kennedy, Chris1, 1 Dept. Biol. Sci., Simon Fraser University, Burnaby, BC, Canada

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P445 Growth and metabolic parameters of silver catfish exposed to herbicides used in rice culture. Baldisserotto, Bernardo*,1, Miron, Denise1, Silva, Lenise1, Machado, Sergio1, Golombieski, Jaqueline1, Marchezan, Enio1, Vieira, Vania1, 1 Universidade Federal de Santa Maria, Santa Maria, RS, Brazil

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P446 Risk Assessment of Mancozeb Fungicide in Beneficial Arthropods and Soil Organisms . Kramer, Vincent*,1, Miles, Mark2, 1 Dow AgroSciences LLC, Indianapolis, IN, USA2 Dow AgroSciences Europe, Abingdon, Oxfordshire, UK

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P447 Changes in Organophosphate Pesticide Concentrations, 1992-2002, San Joaquin River, California. Kuivila, Kathryn*,1, Orlando, James1, 1 U.S. Geological Survey, Sacramento, CA, USA

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P448 Plant Growth Algorithms for Modeling Agrochemical Use on Rice. Breithaupt, James1, Cheplick, J.2, Jones, R.1, Williams, W.*,1, 1 U. S. Environmental Protection Agency, Office of Pesticide Programs, Washington, DC, USA2 Waterborne Environmental, Inc., Leesburg, VA, USA

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P449 Cu(II) Mediated Photodegradation of Chlorpyrifos. Mugot, William*,1,2, Carraway, Elizabeth1, 1 CIET, Clemson University, Pendleton, South Carolina, USA2 Pesticide Analytical Laboratory, Bureau of Plant Industry, Department of Agriculture, Cagayan de Oro, Philippines, Philippines

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P450 In-use Pesticide Concentrations in Canadian Tributaries of Lakes Ontario and Erie. Struger, John*,1, Martos, Perry2, Ripley, Brian2, Boyd, Duncan3, Thorburn, Mary3, 1 Environment Canada, Burlington, ON, Canada2 University of Guelph, Guelph, ON, Canada3 Ontario Ministry of Environment, Toronto, ON, Canada

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P451 Enrichment of bacterial isolates capable of degrading the synthetic pyrethroid insecticide lambda-cyhalothrin. Peacock, J.*,1, Mikell, A.1, Smith, S.2, Moore, M.2, Cooper, C.2, 1 University of Mississippi, University, MS, USA2 USDA-ARS National Sedimentation Laboratory, Oxford, MS, USA

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P452 Risk assessment of malathion based on data from boll weevil eradication in Missouri. Baca, Robert*,1, 1 USDA-APHIS, Riverdale, MD, USA

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P453 Susceptibility of the leaf-eating beetle, Galerucella calmariensis, a biological control agent for purple loosestrife (Lythrum salicaria), to three mosquito control larvicides. Lowe, P*,1, Hershberger, T1, 1 USGS, Laurel, MD

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P455 Estimation of Time-Weighted Exposures to Pesticides Used to Control Adult Mosquitoes. Blanchet, Richard*,1, Bowers, Teresa1, 1 Gradient Corporation, Cambridge, Massachusetts, USA

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