{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23227"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23227","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The life history and control of bigroot morning glory (Ipomoea pandurata)","abstract":"Bigroot morningglory is a large rooted perennial weed which can be difficult to control due to a late emergence time, a large tap root which occurs below the plow layer, and the ability to reproduce from root cuttings or seed. Studies on bigroot morningglory germination, emergence, and growth and on herbicide efficacy, absorption and translocation in this weed, were conducted with the goal of developing effective control measures.","abstract_html":"Bigroot morningglory is a large rooted perennial weed which can be difficult to control due to a late emergence time, a large tap root which occurs below the plow layer, and the ability to reproduce from root cuttings or seed. Studies on bigroot morningglory germination, emergence, and growth and on herbicide efficacy, absorption and translocation in this weed, were conducted with the goal of developing effective control measures.","abstract_has_math":false,"creators":["Horak, Michael Joseph"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agronomy","degree_department":null,"school":null,"contributors":["Wax, Loyd M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:06:41Z","date_published":"2011-05-07T14:06:41Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Agriculture, Agronomy","Biology, Plant Physiology"],"languages":["eng"],"rights":["Copyright 1990 Horak, Michael Joseph"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9026208","(UMI)AAI9026208"],"render_values":[{"text":"AAI9026208","href":null,"code":true},{"text":"(UMI)AAI9026208","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23227","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wax, Loyd M."]},{"key":"dc:creator","label":"Author","values":["Horak, Michael Joseph"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:06:41Z","10000-01-01","1990"]},{"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":["Agriculture, Agronomy","Biology, Plant Physiology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Horak, Michael Joseph"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9026208","(UMI)AAI9026208","http://hdl.handle.net/2142/23227"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Bigroot morningglory is a large rooted perennial weed which can be difficult to control due to a late emergence time, a large tap root which occurs below the plow layer, and the ability to reproduce from root cuttings or seed. Studies on bigroot morningglory germination, emergence, and growth and on herbicide efficacy, absorption and translocation in this weed, were conducted with the goal of developing effective control measures.","Studies showed increased seed germination with chemical or mechanical scarification. The optimum temperatures for germination were 20 or 25 C, while the best pH range for germination was between 6 and 8.5. Plant establishment was greatest at the 2 to 4 cm planting depth and decreased at greater depths. The emergence sequence of bigroot morningglory did not fit the models of hypogeal or epigeal germination. Plant establishment was rapid with 85% of 11 day old seedlings able to sprout after shoot removal.","Emergence of bigroot morningglory occurred 75 growing degree days (GDD) after seeding. Flowering and seed production began 630 GDD after emergence and continued until the first killing frost. Massive accumulation of dry matter occurred after 600 GDD for shoots and 900 GDD for the roots. First year plants became true perennials within six weeks of germination.","Excellent seedling control was obtained with triclopyr (99%), fluroxypyr (91%) and 2,4-D (95%). In field studies on established populations, the best season long suppression was obtained with 2,4-D or triclopyr at an early June application, or triclopyr at an early July application. Ratings taken the spring following treatment showed that glyphosate resulted in the best long term control.","Herbicide efficacy studies revealed that clopyralid, a compound with similar chemical and physiological characteristics to triclopyr, was ineffective on bigroot morningglory. Studies on these two compounds in bigroot morningglory were conducted to determine if absorption and translocation differences could account for differential control observed. Both compounds were readily absorbed (60% absorbed of total recovered at 144 h). Triclopyr was readily translocated, and at 24 h 15% of the herbicide absorbed had moved to the roots. Clopyralid translocation was also rapid and within 24 h, 20% had moved to the roots. It was concluded that absorption and translocation differences could not account for the differential efficacy.","Made available in DSpace on 2011-05-07T14:06:41Z (GMT). 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Studies on bigroot morningglory germination, emergence, and growth and on herbicide efficacy, absorption and translocation in this weed, were conducted with the goal of developing effective control measures.","Studies showed increased seed germination with chemical or mechanical scarification. The optimum temperatures for germination were 20 or 25 C, while the best pH range for germination was between 6 and 8.5. Plant establishment was greatest at the 2 to 4 cm planting depth and decreased at greater depths. The emergence sequence of bigroot morningglory did not fit the models of hypogeal or epigeal germination. Plant establishment was rapid with 85% of 11 day old seedlings able to sprout after shoot removal.","Emergence of bigroot morningglory occurred 75 growing degree days (GDD) after seeding. Flowering and seed production began 630 GDD after emergence and continued until the first killing frost. Massive accumulation of dry matter occurred after 600 GDD for shoots and 900 GDD for the roots. First year plants became true perennials within six weeks of germination.","Excellent seedling control was obtained with triclopyr (99%), fluroxypyr (91%) and 2,4-D (95%). In field studies on established populations, the best season long suppression was obtained with 2,4-D or triclopyr at an early June application, or triclopyr at an early July application. Ratings taken the spring following treatment showed that glyphosate resulted in the best long term control.","Herbicide efficacy studies revealed that clopyralid, a compound with similar chemical and physiological characteristics to triclopyr, was ineffective on bigroot morningglory. Studies on these two compounds in bigroot morningglory were conducted to determine if absorption and translocation differences could account for differential control observed. Both compounds were readily absorbed (60% absorbed of total recovered at 144 h). Triclopyr was readily translocated, and at 24 h 15% of the herbicide absorbed had moved to the roots. Clopyralid translocation was also rapid and within 24 h, 20% had moved to the roots. It was concluded that absorption and translocation differences could not account for the differential efficacy.","Made available in DSpace on 2011-05-07T14:06:41Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026208.pdf: 2926477 bytes, checksum: 21aac066aa2cd0f29ee02f38a70b2b64 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:03:02Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:30:02-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","Restricted to the U of I community indefinitely during batch ingest of legacy ETDs","U of I Only"],"dc:identifier":["AAI9026208","(UMI)AAI9026208","http://hdl.handle.net/2142/23227"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Horak, Michael Joseph"],"dc:subject":["Agriculture, Agronomy","Biology, Plant Physiology"],"dc:title":["The life history and control of bigroot morning glory (Ipomoea pandurata)"],"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":"2026-07-22T22:25:21Z"}