research article
DDT, Soil residues in mature pear orchards: … A Lake County survey
authors
R. H. Gripp
K. Ryugo, University of California
publication information
California Agriculture 20(6):10-12. DOI: 10.3733/ca.v020n06p10.
author affiliations
Russell H. Gripp is farm advisor, Shasta County, formerly of Lake County; Kay Ryugo is Associate Pomologist, Department of Pomology, University of California, Davis, California.
abstract
DDT accumulated over the past 20 years was detected in 22 of 23 pear orchard soils sampled in this Lake County survey. Two-thirds of the DDT was found in the top 6 inches of soil and 94% in the upper 12 inches of soil. Most pear roots in cultivated orchard soils are concentrated between the 1- and 4-ft depths.
author notes
Financial support was obtained from Pear Zone I and cooperation in the study was also received from many Lake County growers. This study was conducted as a part of the University of California Pear Decline Research Program.
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