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DDT, Soil residues in mature pear orchards: … A Lake County survey
Authors
R. H. GrippK. Ryugo
Authors 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.Publication Information
Hilgardia 20(6):10-12. DOI:10.3733/ca.v020n06p10. June 1966.
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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.
Gripp R, Ryugo K. 1966. DDT, Soil residues in mature pear orchards: … A Lake County survey. Hilgardia 20(6):10-12. DOI:10.3733/ca.v020n06p10
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