Title page for ETD etd-06212006-002244


Type of Document Master's Thesis
Author Schooley, Therese Nowak
URN etd-06212006-002244
Title Historical Use of Lead Arsenate and Survey of Soil Residues in Former Apple Orchards in Virginia
Degree Master of Science
Department Entomology
Advisory Committee
Advisor Name Title
Mullins, Donald E. Committee Co-Chair
Weaver, Michael J. Committee Co-Chair
Eick, Matthew J. Committee Member
Keywords
  • lead arsenate
  • historical pesticides
  • lead
  • arsenic
  • orchards
  • soil residues
Date of Defense 2006-05-04
Availability unrestricted
Abstract
Inorganic pesticides including natural chemicals such as arsenic, copper, lead, and sulfur have been used extensively to control pests in agriculture. Lead arsenate (PbHAsO4) was first used in apple orchards in the late 1890's to combat the codling moth, Cydia pomonella (Linnaeus). The affordable and persistent pesticide was applied in ever increasing amounts for the next half century. The persistence in the environment in addition to the heavy applications during the early 1900's may have led to many of the current and former orchards in this country being contaminated. In this study, soil samples were taken from several apple orchards across the state, ranging from Southwest to Northern Virginia and were analyzed for arsenic and lead. Based on naturally occurring background levels and standards set by other states, two orchards sampled in this study were found to have very high levels of arsenic and lead in the soil, Snead Farm and Mint Spring Recreational Park. Average arsenic levels at Mint Spring Recreational Park and Snead Farm were found to be 65.2 ppm and 107.6 ppm, respectively. Average lead levels were found to be 354.5 ppm and 442.3 ppm, respectively. Based on these results, Virginia needs to look at setting standards for lead and arsenic in soil to determine if cleanup of former agricultural lands will be necessary.
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