{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/87686"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/87686","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Impact of Natural Mortality Factors on Populations of the European Corn Borer in Bt- and Non-Bt-Corn Fields in Illinois","abstract":"In 1997 and 1998, field studies were conducted to evaluate the incidence of natural enemies of European corn borer in Bt cornfields. The findings were compared with assessments of the effects of natural enemies in non-Bt cornfields. In my study, corn type did not seem to affect the percentage of eggs parasitized by Trichogramma, the percentage of larvae parasitized by M grandii, or the percentages of European corn borers infected by the entomopathogens N. pyrausta and B. bassiana. However, densities of natural enemies were significantly reduced in Bt corn compared with non-Bt corn. If large acreages are devoted to the production of Bt corn, the overall impact on specific natural enemies of European corn borer could be significant.","abstract_html":"In 1997 and 1998, field studies were conducted to evaluate the incidence of natural enemies of European corn borer in Bt cornfields. The findings were compared with assessments of the effects of natural enemies in non-Bt cornfields. In my study, corn type did not seem to affect the percentage of eggs parasitized by Trichogramma, the percentage of larvae parasitized by M grandii, or the percentages of European corn borers infected by the entomopathogens N. pyrausta and B. bassiana. However, densities of natural enemies were significantly reduced in Bt corn compared with non-Bt corn. If large acreages are devoted to the production of Bt corn, the overall impact on specific natural enemies of European corn borer could be significant.","abstract_has_math":false,"creators":["Venditti, Maria Eugenia Del Valle"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agronomy","degree_department":null,"school":null,"contributors":["Steffey, Kevin L."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T16:22:37Z","date_published":"2015-09-28T16:22:37Z","updated_at":"2026-07-22T22:26:30Z","subjects":["Biology, Entomology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9953168"],"render_values":[{"text":"(MiAaPQ)AAI9953168","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/87686","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Steffey, Kevin L."]},{"key":"dc:creator","label":"Author","values":["Venditti, Maria Eugenia Del Valle"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T16:22:37Z","10000-01-01","1999"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Agronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology, Entomology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/87686","(MiAaPQ)AAI9953168"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In 1997 and 1998, field studies were conducted to evaluate the incidence of natural enemies of European corn borer in Bt cornfields. The findings were compared with assessments of the effects of natural enemies in non-Bt cornfields. In my study, corn type did not seem to affect the percentage of eggs parasitized by Trichogramma, the percentage of larvae parasitized by M grandii, or the percentages of European corn borers infected by the entomopathogens N. pyrausta and B. bassiana. However, densities of natural enemies were significantly reduced in Bt corn compared with non-Bt corn. If large acreages are devoted to the production of Bt corn, the overall impact on specific natural enemies of European corn borer could be significant.","Made available in DSpace on 2015-09-28T16:22:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9953168.pdf: 4165098 bytes, checksum: 16c760bb9abf50b191a8aace12aa1b31 (MD5) Previous issue date: 1999","Embargo set by: Seth Robbins for item 88967 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community indefinitely during batch ingest of legacy ETDs","U of I Only","98 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999."]},{"key":"dc:title","label":"Title","values":["Impact of Natural Mortality Factors on Populations of the European Corn Borer in Bt- and Non-Bt-Corn Fields in Illinois"]}]}],"canonical_facts":{"dc:contributor":["Steffey, Kevin L."],"dc:creator":["Venditti, Maria Eugenia Del Valle"],"dc:date":["2015-09-28T16:22:37Z","10000-01-01","1999"],"dc:description":["In 1997 and 1998, field studies were conducted to evaluate the incidence of natural enemies of European corn borer in Bt cornfields. The findings were compared with assessments of the effects of natural enemies in non-Bt cornfields. In my study, corn type did not seem to affect the percentage of eggs parasitized by Trichogramma, the percentage of larvae parasitized by M grandii, or the percentages of European corn borers infected by the entomopathogens N. pyrausta and B. bassiana. However, densities of natural enemies were significantly reduced in Bt corn compared with non-Bt corn. If large acreages are devoted to the production of Bt corn, the overall impact on specific natural enemies of European corn borer could be significant.","Made available in DSpace on 2015-09-28T16:22:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9953168.pdf: 4165098 bytes, checksum: 16c760bb9abf50b191a8aace12aa1b31 (MD5) Previous issue date: 1999","Embargo set by: Seth Robbins for item 88967 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community indefinitely during batch ingest of legacy ETDs","U of I Only","98 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999."],"dc:identifier":["http://hdl.handle.net/2142/87686","(MiAaPQ)AAI9953168"],"dc:language":["eng"],"dc:subject":["Biology, Entomology"],"dc:title":["Impact of Natural Mortality Factors on Populations of the European Corn Borer in Bt- and Non-Bt-Corn Fields in Illinois"],"dc:type":["text"],"thesis:degree_discipline":["Agronomy"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:30Z"}