Submitted to: Chesapeake Research Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 9/25/2002
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: The Delmarva Peninsula is dominated by agricultural land use, making the streams and tributaries in this area highly vulnerable to agricultural runoff. This area also contains some of the most important aquatic habitat areas for the living resources of the Bay. The magnitude of pesticide loadings to the Delmarva tributaries is poorly understood. Runoff and atmospheric deposition sources must be considered. Pesticide residues were measured in air, rain, surface water and sediment of the lower Choptank River watershed in 2000. The highest pesticide levels were observed in water in the upstream region of the estuary and corn/soybean herbicides were dominant. The herbicides, insecticides and fungicides were also found in air and rain. The presence of chlorothalonil, a popular fungicide used in vegetable production, in air and rainwater indicates regional atmospheric transport from areas outside the Choptank River watershed.