Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population
Herbicides that inhibit protoporphyrinogen oxidase (PPO) are used in more than 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibi...
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| creator | Randell-Singleton, Taylor Hand, Lavesta C. Vance, Jenna C. Wright-Smith, Hannah E. Culpepper, A. Stanley |
| description | Herbicides that inhibit protoporphyrinogen oxidase (PPO) are used in more than 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibiting herbicides was identified by the University of Georgia. Seed were collected from the site along with a known sensitive population; distance between the samples was 200 m, increasing the likelihood of similar environmental and genetic characteristics. To quantify sensitivity for both preemergence (PRE) and POST uses, 21 greenhouse dose-response assessments were conducted from 2017 to 2022. After conducting initial rate-response studies, 13 doses per herbicide were chosen for the POST experiment; field use rates of fomesafen (420 g ai ha
−1
), lactofen (219 g ai ha
−1
), acifluorfen (420 g ai ha
−1
), and trifludimoxazin (25 g ai ha
−1
) ranging from 0× to 4× the field use rate for the susceptible population, and 0× to 40× for the suspect population were applied. Herbicide treatments included adjuvants and were applied to plants 8 to 10 cm in height. Relative resistance factors (RRFs) were calculated for control ratings, mortality, and biomass, and ranged from 105 to 318, 36 to 1,477, 215 to 316, and 9 to 49 for fomesafen, lactofen, acifluorfen, and trifludimoxazin, respectively. In the PRE experiment, herbicide applications included five to nine doses of fomesafen (1× = 210 g ai ha
−1
), flumioxazin (1× = 57 g ai ha
−1
), oxyfluorfen (1× = 561 g ai ha
−1
), and trifludimoxazin (1× = 38 g ai ha
−1
); doses ranged from 0× to 6× for the suspect population and 0× to 2× for the susceptible population. Visual control, mortality, and biomass RRFs ranged from 3 to 5 for fomesafen, 21 to 31 for flumioxazin, 6 to 22 for oxyfluorfen, and 8 to 38 for trifludimoxazin. Results confirm that a Georgia Palmer amaranth population is resistant to PPO-inhibiting herbicides applied both PRE and POST. |
| doi_str_mv | 10.1017/wet.2024.12 |
| format | Article |
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−1
), lactofen (219 g ai ha
−1
), acifluorfen (420 g ai ha
−1
), and trifludimoxazin (25 g ai ha
−1
) ranging from 0× to 4× the field use rate for the susceptible population, and 0× to 40× for the suspect population were applied. Herbicide treatments included adjuvants and were applied to plants 8 to 10 cm in height. Relative resistance factors (RRFs) were calculated for control ratings, mortality, and biomass, and ranged from 105 to 318, 36 to 1,477, 215 to 316, and 9 to 49 for fomesafen, lactofen, acifluorfen, and trifludimoxazin, respectively. In the PRE experiment, herbicide applications included five to nine doses of fomesafen (1× = 210 g ai ha
−1
), flumioxazin (1× = 57 g ai ha
−1
), oxyfluorfen (1× = 561 g ai ha
−1
), and trifludimoxazin (1× = 38 g ai ha
−1
); doses ranged from 0× to 6× for the suspect population and 0× to 2× for the susceptible population. Visual control, mortality, and biomass RRFs ranged from 3 to 5 for fomesafen, 21 to 31 for flumioxazin, 6 to 22 for oxyfluorfen, and 8 to 38 for trifludimoxazin. Results confirm that a Georgia Palmer amaranth population is resistant to PPO-inhibiting herbicides applied both PRE and POST.</description><identifier>ISSN: 0890-037X</identifier><identifier>EISSN: 1550-2740</identifier><identifier>DOI: 10.1017/wet.2024.12</identifier><language>eng</language><publisher>Lawrence: Cambridge University Press</publisher><subject>Adjuvants ; Agronomic crops ; Amaranth ; Amaranthus palmeri ; Bioassays ; Biomass ; Cotton ; Herbicide resistance ; Herbicides ; Mortality ; Protoporphyrinogen oxidase ; Resistance factors ; Seeds ; Soybeans ; Specialty crops ; Visual control</subject><ispartof>Weed technology, 2024-02, Vol.38, Article e23</ispartof><rights>The Author(s), 2024. Published by Cambridge University Press on behalf of Weed Science Society of America. This work is licensed under the Creative Commons Attribution License This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited. (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c298t-ec5b483971bc6adcec897b5533a6e42cb0a7da59c3f7a3395c8558b6f8b855463</citedby><cites>FETCH-LOGICAL-c298t-ec5b483971bc6adcec897b5533a6e42cb0a7da59c3f7a3395c8558b6f8b855463</cites><orcidid>0000-0002-7835-1789 ; 0000-0002-5671-6839 ; 0000-0002-1287-1765 ; 0000-0002-7343-6900 ; 0000-0003-0265-1424</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Randell-Singleton, Taylor</creatorcontrib><creatorcontrib>Hand, Lavesta C.</creatorcontrib><creatorcontrib>Vance, Jenna C.</creatorcontrib><creatorcontrib>Wright-Smith, Hannah E.</creatorcontrib><creatorcontrib>Culpepper, A. Stanley</creatorcontrib><title>Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population</title><title>Weed technology</title><description>Herbicides that inhibit protoporphyrinogen oxidase (PPO) are used in more than 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibiting herbicides was identified by the University of Georgia. Seed were collected from the site along with a known sensitive population; distance between the samples was 200 m, increasing the likelihood of similar environmental and genetic characteristics. To quantify sensitivity for both preemergence (PRE) and POST uses, 21 greenhouse dose-response assessments were conducted from 2017 to 2022. After conducting initial rate-response studies, 13 doses per herbicide were chosen for the POST experiment; field use rates of fomesafen (420 g ai ha
−1
), lactofen (219 g ai ha
−1
), acifluorfen (420 g ai ha
−1
), and trifludimoxazin (25 g ai ha
−1
) ranging from 0× to 4× the field use rate for the susceptible population, and 0× to 40× for the suspect population were applied. Herbicide treatments included adjuvants and were applied to plants 8 to 10 cm in height. Relative resistance factors (RRFs) were calculated for control ratings, mortality, and biomass, and ranged from 105 to 318, 36 to 1,477, 215 to 316, and 9 to 49 for fomesafen, lactofen, acifluorfen, and trifludimoxazin, respectively. In the PRE experiment, herbicide applications included five to nine doses of fomesafen (1× = 210 g ai ha
−1
), flumioxazin (1× = 57 g ai ha
−1
), oxyfluorfen (1× = 561 g ai ha
−1
), and trifludimoxazin (1× = 38 g ai ha
−1
); doses ranged from 0× to 6× for the suspect population and 0× to 2× for the susceptible population. Visual control, mortality, and biomass RRFs ranged from 3 to 5 for fomesafen, 21 to 31 for flumioxazin, 6 to 22 for oxyfluorfen, and 8 to 38 for trifludimoxazin. Results confirm that a Georgia Palmer amaranth population is resistant to PPO-inhibiting herbicides applied both PRE and POST.</description><subject>Adjuvants</subject><subject>Agronomic crops</subject><subject>Amaranth</subject><subject>Amaranthus palmeri</subject><subject>Bioassays</subject><subject>Biomass</subject><subject>Cotton</subject><subject>Herbicide resistance</subject><subject>Herbicides</subject><subject>Mortality</subject><subject>Protoporphyrinogen oxidase</subject><subject>Resistance factors</subject><subject>Seeds</subject><subject>Soybeans</subject><subject>Specialty crops</subject><subject>Visual control</subject><issn>0890-037X</issn><issn>1550-2740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNpFkEtLAzEUhYMoWKsr_0DApUzNYzKZWUrRKhTahYK7kGTutCltMiYp4tJ_7gwVXN3LOd99cBC6pWRGCZUPX5BnjLByRtkZmlAhSMFkSc7RhNQNKQiXH5foKqUdIbRijEzQzzz4zsWD8xscIbmUtbeAc8Dr9apwfuuMy6O5hWicdS0krPt-76DFfQQ4QNzAOKH9IISU_xXnscYLCHHjNF7r_WBgfdBR-7wd0P6419kFf40uOr1PcPNXp-j9-elt_lIsV4vX-eOysKypcwFWmLLmjaTGVrq1YOtGGiE41xWUzBqiZatFY3knNeeNsLUQtam62gxNWfEpujvt7WP4PELKaheO0Q8nFWuEpJSLig3U_YmyMaQUoVN9dMPT34oSNWashozVmLGijP8C2zhyFw</recordid><startdate>20240215</startdate><enddate>20240215</enddate><creator>Randell-Singleton, Taylor</creator><creator>Hand, Lavesta C.</creator><creator>Vance, Jenna C.</creator><creator>Wright-Smith, Hannah E.</creator><creator>Culpepper, A. Stanley</creator><general>Cambridge University Press</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-7835-1789</orcidid><orcidid>https://orcid.org/0000-0002-5671-6839</orcidid><orcidid>https://orcid.org/0000-0002-1287-1765</orcidid><orcidid>https://orcid.org/0000-0002-7343-6900</orcidid><orcidid>https://orcid.org/0000-0003-0265-1424</orcidid></search><sort><creationdate>20240215</creationdate><title>Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population</title><author>Randell-Singleton, Taylor ; Hand, Lavesta C. ; Vance, Jenna C. ; Wright-Smith, Hannah E. ; Culpepper, A. Stanley</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c298t-ec5b483971bc6adcec897b5533a6e42cb0a7da59c3f7a3395c8558b6f8b855463</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Adjuvants</topic><topic>Agronomic crops</topic><topic>Amaranth</topic><topic>Amaranthus palmeri</topic><topic>Bioassays</topic><topic>Biomass</topic><topic>Cotton</topic><topic>Herbicide resistance</topic><topic>Herbicides</topic><topic>Mortality</topic><topic>Protoporphyrinogen oxidase</topic><topic>Resistance factors</topic><topic>Seeds</topic><topic>Soybeans</topic><topic>Specialty crops</topic><topic>Visual control</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Randell-Singleton, Taylor</creatorcontrib><creatorcontrib>Hand, Lavesta C.</creatorcontrib><creatorcontrib>Vance, Jenna C.</creatorcontrib><creatorcontrib>Wright-Smith, Hannah E.</creatorcontrib><creatorcontrib>Culpepper, A. Stanley</creatorcontrib><collection>CrossRef</collection><jtitle>Weed technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Randell-Singleton, Taylor</au><au>Hand, Lavesta C.</au><au>Vance, Jenna C.</au><au>Wright-Smith, Hannah E.</au><au>Culpepper, A. Stanley</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population</atitle><jtitle>Weed technology</jtitle><date>2024-02-15</date><risdate>2024</risdate><volume>38</volume><artnum>e23</artnum><issn>0890-037X</issn><eissn>1550-2740</eissn><abstract>Herbicides that inhibit protoporphyrinogen oxidase (PPO) are used in more than 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibiting herbicides was identified by the University of Georgia. Seed were collected from the site along with a known sensitive population; distance between the samples was 200 m, increasing the likelihood of similar environmental and genetic characteristics. To quantify sensitivity for both preemergence (PRE) and POST uses, 21 greenhouse dose-response assessments were conducted from 2017 to 2022. After conducting initial rate-response studies, 13 doses per herbicide were chosen for the POST experiment; field use rates of fomesafen (420 g ai ha
−1
), lactofen (219 g ai ha
−1
), acifluorfen (420 g ai ha
−1
), and trifludimoxazin (25 g ai ha
−1
) ranging from 0× to 4× the field use rate for the susceptible population, and 0× to 40× for the suspect population were applied. Herbicide treatments included adjuvants and were applied to plants 8 to 10 cm in height. Relative resistance factors (RRFs) were calculated for control ratings, mortality, and biomass, and ranged from 105 to 318, 36 to 1,477, 215 to 316, and 9 to 49 for fomesafen, lactofen, acifluorfen, and trifludimoxazin, respectively. In the PRE experiment, herbicide applications included five to nine doses of fomesafen (1× = 210 g ai ha
−1
), flumioxazin (1× = 57 g ai ha
−1
), oxyfluorfen (1× = 561 g ai ha
−1
), and trifludimoxazin (1× = 38 g ai ha
−1
); doses ranged from 0× to 6× for the suspect population and 0× to 2× for the susceptible population. Visual control, mortality, and biomass RRFs ranged from 3 to 5 for fomesafen, 21 to 31 for flumioxazin, 6 to 22 for oxyfluorfen, and 8 to 38 for trifludimoxazin. Results confirm that a Georgia Palmer amaranth population is resistant to PPO-inhibiting herbicides applied both PRE and POST.</abstract><cop>Lawrence</cop><pub>Cambridge University Press</pub><doi>10.1017/wet.2024.12</doi><orcidid>https://orcid.org/0000-0002-7835-1789</orcidid><orcidid>https://orcid.org/0000-0002-5671-6839</orcidid><orcidid>https://orcid.org/0000-0002-1287-1765</orcidid><orcidid>https://orcid.org/0000-0002-7343-6900</orcidid><orcidid>https://orcid.org/0000-0003-0265-1424</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Weed technology, 2024-02, Vol.38, Article e23 |
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| source | Alma/SFX Local Collection; Cambridge University Press Journals Complete |
| subjects | Adjuvants Agronomic crops Amaranth Amaranthus palmeri Bioassays Biomass Cotton Herbicide resistance Herbicides Mortality Protoporphyrinogen oxidase Resistance factors Seeds Soybeans Specialty crops Visual control |
| title | Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population |
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