Pub Date : 2023-08-21DOI: 10.51694/advweedsci/2023;41:00009
E. Roncatto, A. Barroso, A. Albrecht, B. D. Novello, Renan G. Silva, Caroline B.W. Backes
interference in the early stages of soybean development can compromise its yield. The use of herbicides with residual effects at the time of sowing is an alternative to reduce weed density and emergence time, consequently, the damage caused by their interference. Therefore, weed development can be reduced, which can result in easier post-emergence control. The combination of herbicide modes of action extends the spectrum of control and delays herbicide resistance evolution. Objective: This work aimed to determine the onset of the critical period of weed control (CPWC) from the application of residual herbicides mixtures at soybean sowing. Methods: Two experiments were carried out in 2021/2022, the first in a conventional tillage system with increasing periods of soybean/ weeds coexistence (14, 28, 42, and 56 days after crop emergence). The second experiment consisted of a no-tillage system with soybean/weeds coexistence for 30, 45, 60, 75, and 90 days after crop emergence. On the day of soybean sowing, mixtures of the herbicides diclosulam + pyroxasulfone, flumioxazin + pyroxasulfone and diuron + sulfentrazone were applied, in addition to the untreated check. Soybean yield was evaluated evaluated upon harvest and data compared by non-linear regressions to CPWC determination. Results: The application of residual herbicides can allowing reduces losses relative to the untreated control by up to 57%. CPWC beginning can be extended from eight to forty days, depending on mixes and acceptable losses. Conclusions: The use of the mixture of residual herbicides are a good option for weed interference reduction for soybean crop.
{"title":"Shortening critical period of weed control at soybean by residual herbicide mixtures","authors":"E. Roncatto, A. Barroso, A. Albrecht, B. D. Novello, Renan G. Silva, Caroline B.W. Backes","doi":"10.51694/advweedsci/2023;41:00009","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00009","url":null,"abstract":"interference in the early stages of soybean development can compromise its yield. The use of herbicides with residual effects at the time of sowing is an alternative to reduce weed density and emergence time, consequently, the damage caused by their interference. Therefore, weed development can be reduced, which can result in easier post-emergence control. The combination of herbicide modes of action extends the spectrum of control and delays herbicide resistance evolution. Objective: This work aimed to determine the onset of the critical period of weed control (CPWC) from the application of residual herbicides mixtures at soybean sowing. Methods: Two experiments were carried out in 2021/2022, the first in a conventional tillage system with increasing periods of soybean/ weeds coexistence (14, 28, 42, and 56 days after crop emergence). The second experiment consisted of a no-tillage system with soybean/weeds coexistence for 30, 45, 60, 75, and 90 days after crop emergence. On the day of soybean sowing, mixtures of the herbicides diclosulam + pyroxasulfone, flumioxazin + pyroxasulfone and diuron + sulfentrazone were applied, in addition to the untreated check. Soybean yield was evaluated evaluated upon harvest and data compared by non-linear regressions to CPWC determination. Results: The application of residual herbicides can allowing reduces losses relative to the untreated control by up to 57%. CPWC beginning can be extended from eight to forty days, depending on mixes and acceptable losses. Conclusions: The use of the mixture of residual herbicides are a good option for weed interference reduction for soybean crop.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-11DOI: 10.51694/advweedsci/2023;41:00010
D. Gazziero, A. F. Silva, O. R. Silveira, Stephen O. Duke, A. Cerdeira
notification, an epidemiological survey was carried out to identify the place of entry and area of dispersion. Containment and eradication measures were quickly established by state and federal phytosanitary authorities through legislative measures. After identification, it was classified as a quarantine weed under official control. The Palmer amaranth Containment and Eradication Committee was established in order to support the phytosanitary defense agencies in the actions to combat the weed. State agricultural inspectors were trained to identify the species and survey the State. Actions aimed at the farmers were also carried out, highlighting the importance of identification, control and awareness. The weed was found in six municipalities in 10 farms in Mato Grosso. The importation of a used cotton harvester from the United States of America and its internal transit were found to be the main route of entry and spread of the weed. The weed spread to the State of Mato Grosso do Sul, in 2022 and was detected in two municipalities and six properties. A detailed survey is on progress. It is necessary to understand movement routes and establish measures to contain it. Effective measures regarding the importation and cleaning of used machinery needs to be adopted to avoid weed seed dispersal, and Federal legislation is needed to contain and eradicate the weed.
{"title":"Introduction and management of Amaranthus palmeri in Brazil","authors":"D. Gazziero, A. F. Silva, O. R. Silveira, Stephen O. Duke, A. Cerdeira","doi":"10.51694/advweedsci/2023;41:00010","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00010","url":null,"abstract":"notification, an epidemiological survey was carried out to identify the place of entry and area of dispersion. Containment and eradication measures were quickly established by state and federal phytosanitary authorities through legislative measures. After identification, it was classified as a quarantine weed under official control. The Palmer amaranth Containment and Eradication Committee was established in order to support the phytosanitary defense agencies in the actions to combat the weed. State agricultural inspectors were trained to identify the species and survey the State. Actions aimed at the farmers were also carried out, highlighting the importance of identification, control and awareness. The weed was found in six municipalities in 10 farms in Mato Grosso. The importation of a used cotton harvester from the United States of America and its internal transit were found to be the main route of entry and spread of the weed. The weed spread to the State of Mato Grosso do Sul, in 2022 and was detected in two municipalities and six properties. A detailed survey is on progress. It is necessary to understand movement routes and establish measures to contain it. Effective measures regarding the importation and cleaning of used machinery needs to be adopted to avoid weed seed dispersal, and Federal legislation is needed to contain and eradicate the weed.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.51694/advweedsci/2023;41:00008
A. Tavassoli, J. Gherekhloo, F. Ghaderi‐Far, E. Zand, M. D. Osuna, R. Prado
: Background: Among the weeds in Iran, resistant Lolium rigidum Gaud is considered a troublesome weed in winter cereals due to its tendency to evolve cross (CR) and multiple resistance (MR) to herbicides. Objective: This research examined the patterns and mechanisms of L. rigidum resistance to clodinafop-propargyl (CP) and mesosulfuron methyl+iodosulfuron methyl (MI). Methods: Experiments were conducted on four putative-resistant L. rigidum biotypes and one susceptible biotype. The dose-response assay was performed on the biotypes with CP and MI. CR and MR were investigated with haloxyfop-R-methyl (HRM), sethoxydim (SD), pinoxaden (PN). and isoproturon+ diflufenican (ID) herbicides. An indirect study of the metabolism of herbicides was carried out using the cytochrome P450 monooxygenase (CYP450) inhibitors 1-aminobenzotriazole (ABT), piperonyl butoxide (PBO) and malathion. Finally, sequencing of ALS and ACCase genes was performed to investigate target-site resistance. Results: All putative-resistant L. rigidum biotypes were resistant to CP, MI, and HRM, but susceptible to SD, PN, and ID. The indirect study showed that the P450 enzyme had no role in the evolution of resistance in L. rigidum biotypes. Resistance in this species was due to Ile-1781-Leu and Pro-197-Ser substitutions on ACCase and ALS encoding genes led to resistance, respectively. Conclusions: Resistance in the studied L. rigidum biotypes to ALS and ACCase inhibiting was due of target site resistance. If these resistant biotypes are not controlled, they will become a problem for farmers in the region
{"title":"Rigid Ryegrass (Lolium rigidum Gaud) Resistant to ACCase and ALS inhibitors in northeastern Iran","authors":"A. Tavassoli, J. Gherekhloo, F. Ghaderi‐Far, E. Zand, M. D. Osuna, R. Prado","doi":"10.51694/advweedsci/2023;41:00008","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00008","url":null,"abstract":": Background: Among the weeds in Iran, resistant Lolium rigidum Gaud is considered a troublesome weed in winter cereals due to its tendency to evolve cross (CR) and multiple resistance (MR) to herbicides. Objective: This research examined the patterns and mechanisms of L. rigidum resistance to clodinafop-propargyl (CP) and mesosulfuron methyl+iodosulfuron methyl (MI). Methods: Experiments were conducted on four putative-resistant L. rigidum biotypes and one susceptible biotype. The dose-response assay was performed on the biotypes with CP and MI. CR and MR were investigated with haloxyfop-R-methyl (HRM), sethoxydim (SD), pinoxaden (PN). and isoproturon+ diflufenican (ID) herbicides. An indirect study of the metabolism of herbicides was carried out using the cytochrome P450 monooxygenase (CYP450) inhibitors 1-aminobenzotriazole (ABT), piperonyl butoxide (PBO) and malathion. Finally, sequencing of ALS and ACCase genes was performed to investigate target-site resistance. Results: All putative-resistant L. rigidum biotypes were resistant to CP, MI, and HRM, but susceptible to SD, PN, and ID. The indirect study showed that the P450 enzyme had no role in the evolution of resistance in L. rigidum biotypes. Resistance in this species was due to Ile-1781-Leu and Pro-197-Ser substitutions on ACCase and ALS encoding genes led to resistance, respectively. Conclusions: Resistance in the studied L. rigidum biotypes to ALS and ACCase inhibiting was due of target site resistance. If these resistant biotypes are not controlled, they will become a problem for farmers in the region","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70676042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-05DOI: 10.51694/advweedsci/2023;41:00006
Elouize Xavier, M. Trezzi, M. D. C. Oliveira, R. A. Vidal
: Background: Crop tolerance to herbicides and the effectiveness of weed control are key considerations of a chemical management program. Crop tolerance levels and the mechanism involved is of great importance in ensuring the safe use of an herbicide. Objective: This study aims to evaluate the effect of mefenpyr-diethyl as
{"title":"Use of inhibitors and protectors in the tolerance of white oat cultivars to the penoxsulam herbicide","authors":"Elouize Xavier, M. Trezzi, M. D. C. Oliveira, R. A. Vidal","doi":"10.51694/advweedsci/2023;41:00006","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00006","url":null,"abstract":": Background: Crop tolerance to herbicides and the effectiveness of weed control are key considerations of a chemical management program. Crop tolerance levels and the mechanism involved is of great importance in ensuring the safe use of an herbicide. Objective: This study aims to evaluate the effect of mefenpyr-diethyl as","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-12DOI: 10.51694/advweedsci/2023;41:00005
Zahara Mahmoodi Atabaki, J. Gherekhloo, F. Ghaderi‐Far, O. Ansari, S. Hassanpour-bourkheili, R. de Prado
various environmental conditions is critical for their effective management, whereas such study has not been carried out thoroughly on this species. Objective: This study was carried out to investigate the effect of some environmental factors on seed germination and emergence of cutleaf geranium. Methods: The seeds were subjected to various environmental factors including water potentials, salinity, pH, high temperatures, burial depth and flooding at the temperature resulting in the highest germination (10 °C). All experiments were carried out twice, which were done consecutively. Results: Germination percentage was halved at a water potential of -0.6 MPa, and no germination was observed at -2 MPa. Geranium dissectum seeds had negligible germination at 200 mM NaCl concentration. Seeds germinated over a pH range of 5-8, with the highest germination at pH between 6 and 7. Germination of this species reached from 85.0% after treatment at 80 °C but no seeds germinated after exposure to 120 °C. Maximum emergence was estimated 88.8%, which was halved at 2.2 cm depth. No emergence was observed at 4 cm or greater depths. Germination was 88.4% to 0% 15 days after flooding. Conclusions: This species may not usually be found in areas with poor environmental conditions, and a semi-deep tillage or inclusion of rice in crop rotation may be used to control this weed.
{"title":"The effect of environmental factors on seed germination and emergence of cutleaf geranium","authors":"Zahara Mahmoodi Atabaki, J. Gherekhloo, F. Ghaderi‐Far, O. Ansari, S. Hassanpour-bourkheili, R. de Prado","doi":"10.51694/advweedsci/2023;41:00005","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00005","url":null,"abstract":"various environmental conditions is critical for their effective management, whereas such study has not been carried out thoroughly on this species. Objective: This study was carried out to investigate the effect of some environmental factors on seed germination and emergence of cutleaf geranium. Methods: The seeds were subjected to various environmental factors including water potentials, salinity, pH, high temperatures, burial depth and flooding at the temperature resulting in the highest germination (10 °C). All experiments were carried out twice, which were done consecutively. Results: Germination percentage was halved at a water potential of -0.6 MPa, and no germination was observed at -2 MPa. Geranium dissectum seeds had negligible germination at 200 mM NaCl concentration. Seeds germinated over a pH range of 5-8, with the highest germination at pH between 6 and 7. Germination of this species reached from 85.0% after treatment at 80 °C but no seeds germinated after exposure to 120 °C. Maximum emergence was estimated 88.8%, which was halved at 2.2 cm depth. No emergence was observed at 4 cm or greater depths. Germination was 88.4% to 0% 15 days after flooding. Conclusions: This species may not usually be found in areas with poor environmental conditions, and a semi-deep tillage or inclusion of rice in crop rotation may be used to control this weed.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.51694/advweedsci/2023;41:00001
Nelson M. Carranza, Diana Zabala-Pardo, Esperanza Torres-Rojas, G. Plaza
: Junglerice ( Echinochloa colona ) is one of the most problematic weed species in rice fields in Colombia. Herbicides inhibitors of the enzyme acetolactate synthase (ALS) have been widely used to control junglerice and other grass species. ALS inhibitors have the highest reports of resistance worldwide, and Colombia has recent reports of ALS resistance in E. colona . The timely and accurate detection of resistance sources is imperative for mitigating and managing herbicide resistance. However, for E. colona there are no published sequences of the ALS gene . In this research, primer design, RNA extraction, cloning, miniprep, and PCR were used to obtain the first partial sequence of the ALS gene on susceptible and resistant accessions of E. colona . The sequences did not present nucleotide differences that could be associated with target-site resistance to ALS inhibitors.
{"title":"Characterization of acetolactate synthase gene (ALS) in Echinochloa colona (L.) Link., a hexaploid weed species","authors":"Nelson M. Carranza, Diana Zabala-Pardo, Esperanza Torres-Rojas, G. Plaza","doi":"10.51694/advweedsci/2023;41:00001","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00001","url":null,"abstract":": Junglerice ( Echinochloa colona ) is one of the most problematic weed species in rice fields in Colombia. Herbicides inhibitors of the enzyme acetolactate synthase (ALS) have been widely used to control junglerice and other grass species. ALS inhibitors have the highest reports of resistance worldwide, and Colombia has recent reports of ALS resistance in E. colona . The timely and accurate detection of resistance sources is imperative for mitigating and managing herbicide resistance. However, for E. colona there are no published sequences of the ALS gene . In this research, primer design, RNA extraction, cloning, miniprep, and PCR were used to obtain the first partial sequence of the ALS gene on susceptible and resistant accessions of E. colona . The sequences did not present nucleotide differences that could be associated with target-site resistance to ALS inhibitors.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.51694/advweedsci/2023;41:00004
F. Patel, M. Trezzi, A. L. Nunes, H. Bittencourt, F. Diesel, F. Pagnoncelli
: Background: There is little information on how different soil cover systems influence the residual effect of pre-emergent herbicides used in soybean cultivation in Brazil. Objective: The objective was to compare the persistence of different pre-emergent herbicides in a Latosolic Dystrophic Red Nitosol soil in the presence or absence of black oat straw on the soil surface. Methods: The herbicides used were chlorimuron-ethyl (40.0 g ai ha -1 ), diclosulam (70.1 g ai ha -1 ), flumioxazin (100.0 ai g ha -1 ) and saflufenacil (70.0 g ai ha -1 ). Soil samples were collected at 0, 5, 10, 15, 20, 32, 46 and 60 days after herbicide application. The bioavailability of the herbicides was evaluated in a greenhouse using cucumber plants as bioindicators. Results: Rainfall was necessary for the herbicides to go through the straw layer and reach the soil. Using straw, the half-life times for chlorimuron, diclosulam, flumioxazin and saflufenacil were 42, 61, 49 and 26 days, while without straw, they were 23, 45, 8 and 10 days, respectively. Conclusion: The presence of straw on the soil surface increased the persistence of herbicides in the soil.
背景:关于巴西大豆种植中不同土壤覆盖系统如何影响苗期前除草剂残留效果的信息很少。目的:比较在黑麦秸秆存在或不存在的情况下，不同出苗前除草剂在红壤营养不良土中的持久性。方法:采用氯脲乙基(40.0 g / hm2 -1)、双氯舒仑(70.1 g / hm2 -1)、氟恶嗪(100.0 g / hm2 -1)、氟氟那西(70.0 g / hm2 -1)等除草剂。分别于施药后0、5、10、15、20、32、46和60 d采集土壤样品。以黄瓜为生物指示剂，在温室中评价了两种除草剂的生物利用度。结果:降雨是除草剂穿过秸秆层到达土壤的必要条件。使用吸管时，氯脲、双氯舒仑、氟恶嗪和氟氟那西的半衰期分别为42、61、49和26 d，不使用吸管时，半衰期分别为23、45、8和10 d。结论:秸秆的存在增加了除草剂在土壤中的持久性。
{"title":"The straw presence preceding soybean crop increases the persistence of residual herbicides","authors":"F. Patel, M. Trezzi, A. L. Nunes, H. Bittencourt, F. Diesel, F. Pagnoncelli","doi":"10.51694/advweedsci/2023;41:00004","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00004","url":null,"abstract":": Background: There is little information on how different soil cover systems influence the residual effect of pre-emergent herbicides used in soybean cultivation in Brazil. Objective: The objective was to compare the persistence of different pre-emergent herbicides in a Latosolic Dystrophic Red Nitosol soil in the presence or absence of black oat straw on the soil surface. Methods: The herbicides used were chlorimuron-ethyl (40.0 g ai ha -1 ), diclosulam (70.1 g ai ha -1 ), flumioxazin (100.0 ai g ha -1 ) and saflufenacil (70.0 g ai ha -1 ). Soil samples were collected at 0, 5, 10, 15, 20, 32, 46 and 60 days after herbicide application. The bioavailability of the herbicides was evaluated in a greenhouse using cucumber plants as bioindicators. Results: Rainfall was necessary for the herbicides to go through the straw layer and reach the soil. Using straw, the half-life times for chlorimuron, diclosulam, flumioxazin and saflufenacil were 42, 61, 49 and 26 days, while without straw, they were 23, 45, 8 and 10 days, respectively. Conclusion: The presence of straw on the soil surface increased the persistence of herbicides in the soil.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.51694/advweedsci/2023;41:00003
Suma Basak, Bo Bi, C. Gonçalves, Jinesh D. Patel, Qiyu Luo, P. McCullough, J. S. McElroy, Anderson Luis Nunes
: Background: Diagnostic bioassays are used to screen the suspected R population. They are conducted at a single herbicide dose and evaluated at a specific time after treatment that can differentiate resistant from susceptible population. Objective: Three different bioassays were evaluated to assess the detection of acetyl CoA carboxylase-inhibiting herbicides resistance in D. ciliaris . Method: Increasing herbicide rates were used to evaluate the three bioassays for differentiating R from S populations. Results: R1 and R2 differed from S in all employed bioassays. In the Agar-based gel box box assay, the S biotype had greater plant damage at the lower herbicide concentration relative to the R biotypes 3 DAT but differences between R and S decreased over time. In the leaf flotation assay, R biotypes floated at the lower concentration on the surface, whereas the leaves of S biotypes failed to float. For the electrical conductivity assay, the S biotype contained high electrical conductivity due to the high leaching of electrolyte into the water across all four herbicides tested than the R biotypes. Conclusion: While these assays were able to separate R and S biotypes, the level of resistance difference for any assay was no greater than 40% depending on rating data and exposure dose. While a statistical separation could be achieved using a rate response regression analysis for these bioassays, our data highlights the challenges associated whether these methods could provide an obvious difference at any single rate or rating data to be used as a consistent, effective first-phase resistance screen.
{"title":"Discrimination of ACCase-inhibiting herbicides-resistant Digitaria ciliaris populations with three diagnostic bioassays","authors":"Suma Basak, Bo Bi, C. Gonçalves, Jinesh D. Patel, Qiyu Luo, P. McCullough, J. S. McElroy, Anderson Luis Nunes","doi":"10.51694/advweedsci/2023;41:00003","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00003","url":null,"abstract":": Background: Diagnostic bioassays are used to screen the suspected R population. They are conducted at a single herbicide dose and evaluated at a specific time after treatment that can differentiate resistant from susceptible population. Objective: Three different bioassays were evaluated to assess the detection of acetyl CoA carboxylase-inhibiting herbicides resistance in D. ciliaris . Method: Increasing herbicide rates were used to evaluate the three bioassays for differentiating R from S populations. Results: R1 and R2 differed from S in all employed bioassays. In the Agar-based gel box box assay, the S biotype had greater plant damage at the lower herbicide concentration relative to the R biotypes 3 DAT but differences between R and S decreased over time. In the leaf flotation assay, R biotypes floated at the lower concentration on the surface, whereas the leaves of S biotypes failed to float. For the electrical conductivity assay, the S biotype contained high electrical conductivity due to the high leaching of electrolyte into the water across all four herbicides tested than the R biotypes. Conclusion: While these assays were able to separate R and S biotypes, the level of resistance difference for any assay was no greater than 40% depending on rating data and exposure dose. While a statistical separation could be achieved using a rate response regression analysis for these bioassays, our data highlights the challenges associated whether these methods could provide an obvious difference at any single rate or rating data to be used as a consistent, effective first-phase resistance screen.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"209 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-13DOI: 10.51694/advweedsci/2023;41:00026
Eduardo C. Rudell, Bianca A. Zanrosso, Dieferson Frandaloso, Argel J. Giacomini, Daelcio V. Spadotto, Leandro Vargas, Anderson L. Nunes, Fernando M. Santos
: Background: Diversified crop systems provide several advantages for crop production and the agricultural ecosystem. In contrast, growing the same crop for consecutive years increases weeds, insects, and diseases issues, adding further cost to crop production
{"title":"Integrated weed management strategies in a long-term crop rotation system","authors":"Eduardo C. Rudell, Bianca A. Zanrosso, Dieferson Frandaloso, Argel J. Giacomini, Daelcio V. Spadotto, Leandro Vargas, Anderson L. Nunes, Fernando M. Santos","doi":"10.51694/advweedsci/2023;41:00026","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00026","url":null,"abstract":": Background: Diversified crop systems provide several advantages for crop production and the agricultural ecosystem. In contrast, growing the same crop for consecutive years increases weeds, insects, and diseases issues, adding further cost to crop production","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135126911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-13DOI: 10.51694/advweedsci/2023;41:00002
P. A. Conciani, K. F. Mendes, R. N. de Sousa, Andrew de P. Ribeiro, R. F. Pimpinato, V. L. Tornisielo
. Peanut and sorghum are excellent phytoremediators of 14 C-tebuthiuron in herbicide-contaminated soil.
． 花生和高粱是除草剂污染土壤中14 -c -丁硫脲的优良植物修复剂。
{"title":"Peanut and sorghum are excellent phytoremediators of 14C-tebuthiuron in herbicide-contaminated soil","authors":"P. A. Conciani, K. F. Mendes, R. N. de Sousa, Andrew de P. Ribeiro, R. F. Pimpinato, V. L. Tornisielo","doi":"10.51694/advweedsci/2023;41:00002","DOIUrl":"https://doi.org/10.51694/advweedsci/2023;41:00002","url":null,"abstract":". Peanut and sorghum are excellent phytoremediators of 14 C-tebuthiuron in herbicide-contaminated soil.","PeriodicalId":29845,"journal":{"name":"Advances in Weed Science","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70675400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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