Evaluation of Provisia Rice in Arkansas Rice Production Systems PDF Download
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Author: Zachary Douglas Lancaster
Publisher:
ISBN:
Category : Rice
Languages : en
Pages : 228
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Book Description
With the continued evolution of herbicide resistance, it is becoming more difficult to achieve adequate weed control in Arkansas rice production systems. Thus, new technologies are needed to combat these troublesome weeds. A new non-GMO, herbicide-resistant rice type is under development that is resistant to quizalofop, an acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicide that will allow for selective grass weed control in rice. With the commercialization of this technology by 2018, research was conducted to determine the best fit for quizalofop-resistant rice in current production systems. Experiments included evaluation of off-target movement of quizalofop, determination of plant-back risk from quizalofop application, best rate structure of quizalofop, general efficacy on common grass weeds, and tank-mix interactions of quizalofop with common herbicides used in rice. Overall, the risk for off-target movement of quizalofop on Midsouth grass crops is minimal, with injury only observed under conditions that would be rare in the field. Plant-back risk after quizalofop or other ACCase-inhibiting herbicide applications is relatively low, with only grain sorghum and corn showing potential for injury if planted in quick succession after herbicide application. Quizalofop applications in quizalofop-resistant rice are effective for controlling barnyardgrass, broadleaf signalgrass, and red rice, with the best results from sequential applications of quizalofop at 120 g ai ha-1. A screening of barnyardgrass accessions from across the state of Arkansas proved quizalofop to be an effective graminicides, controlling all accessions evaluated. Tank-mix research for quizalofop and common rice herbicides prove that caution needs to be taken when tank-mixing quizalofop, especially with acetolactate synthase-inhibiting herbicides and auxinic herbicides due to the risk of antagonism. Overall, this research supports that quizalofop-resistant rice can be an effective tool for Arkansas rice producers.
Author: Zachary Douglas Lancaster
Publisher:
ISBN:
Category : Rice
Languages : en
Pages : 228
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Book Description
With the continued evolution of herbicide resistance, it is becoming more difficult to achieve adequate weed control in Arkansas rice production systems. Thus, new technologies are needed to combat these troublesome weeds. A new non-GMO, herbicide-resistant rice type is under development that is resistant to quizalofop, an acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicide that will allow for selective grass weed control in rice. With the commercialization of this technology by 2018, research was conducted to determine the best fit for quizalofop-resistant rice in current production systems. Experiments included evaluation of off-target movement of quizalofop, determination of plant-back risk from quizalofop application, best rate structure of quizalofop, general efficacy on common grass weeds, and tank-mix interactions of quizalofop with common herbicides used in rice. Overall, the risk for off-target movement of quizalofop on Midsouth grass crops is minimal, with injury only observed under conditions that would be rare in the field. Plant-back risk after quizalofop or other ACCase-inhibiting herbicide applications is relatively low, with only grain sorghum and corn showing potential for injury if planted in quick succession after herbicide application. Quizalofop applications in quizalofop-resistant rice are effective for controlling barnyardgrass, broadleaf signalgrass, and red rice, with the best results from sequential applications of quizalofop at 120 g ai ha-1. A screening of barnyardgrass accessions from across the state of Arkansas proved quizalofop to be an effective graminicides, controlling all accessions evaluated. Tank-mix research for quizalofop and common rice herbicides prove that caution needs to be taken when tank-mixing quizalofop, especially with acetolactate synthase-inhibiting herbicides and auxinic herbicides due to the risk of antagonism. Overall, this research supports that quizalofop-resistant rice can be an effective tool for Arkansas rice producers.
Author: R. E. Talbert
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 204
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Book Description
Weed control is economically important for production of rice, a major crop in Arkansas. These findings summarize efforts of the team of Arkansas scientists working on weed control strategies for rice during 1997. Various technologies were evaluated in field studies at five locations involving the major weed problems and rice production systems used in the state. Results from these studies will add to the arsenal of weed control options for producers. Highlights include synergists and safeners for herbicides to aid in control of propanil-resistant barnyard grass; herbicides and flooding techniques for control of red rice and other weeds; and the use of transgenic rice cultivars for broad spectrum weed control. The preliminary results reported here generally warrant further testing for more advanced findings and for the labeling of new technologies, and finally are the basis for updating safe, effective, and economical recommendations to Arkansas rice producers.
Author: Michael Edward Fogleman
Publisher:
ISBN:
Category : Herbicide resistance
Languages : en
Pages : 272
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Book Description
The prevalence of herbicide resistance and lack of effective management options for controlling problematic weeds such as barnyardgrass and weedy rice in Arkansas rice production has led to exploration of alternative herbicide sites of action (SOA). Very-long-chain fatty acid (VLCFA)-inhibiting herbicides are not currently labeled for use in U.S. rice production but have been used with success in other row crops and in rice production in Asia. Based on preliminary research, rice tolerance and weed control were evaluated following various application timings and rates of acetochlor and pethoxamid, in addition to several other VLCFA-inhibiting herbicides. Rice tolerance to acetochlor was maximized when applied in a microencapsulated (ME) formulation at the 1-leaf growth stage. Rice also demonstrated adequate tolerance to ME acetochlor applied delayed-preemergence (DPRE); however, when activating rainfall was received soon after application, unacceptable rice injury was observed and is therefore not recommended. When properly activated, barnyardgrass control and rough rice yield was comparable between acetochlor-based herbicide programs and clomazone-based programs in Clearfield and Provisia rice systems. However, it should be noted that early-season barnyardgrass control and rough rice yields were generally higher following clomazone-based herbicide programs due to minimal rice injury and excellent barnyardgrass control in all environments. Both ME acetochlor and pethoxamid provided early-season control of weedy rice and other grass species when applied soon after planting. Although DPRE applications were the most effective for weed control, they pose extreme risk for rice injury and should be avoided. In contrast, weed control was slightly reduced by delaying applications to 1-leaf rice but risk for rice injury was also decreased. Winter-applied VLCFA-inhibiting herbicides caused tolerable injury to rice planted the following spring. Microencapsulated acetochlor and pyroxasulfone provided considerable suppression of weedy rice for as long as seven weeks after planting, suggesting an alternative method for controlling weedy rice. Should ME acetochlor and pethoxamid be registered for use in U.S. rice production, they have potential to provide growers with an alternative SOA to combat herbicide resistance and control problematic weed species.
Author: R. E. Talbert
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 202
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Book Description
Weed control is economically important for production of rice, a major crop in Arkansas. These findings summarize efforts of the team of Arkansas scientists working on weed control strategies for rice during 1998. Various technologies were evaluated in field studies involving the major weed problems and rice production systems used in the state. Results from these studies will add to the arsenal of weed control options for producers. The preliminary results reported here generally warrant further testing for more advanced findings and for the labeling of new technologies and, finally, are the basis for updating safe, effective, and economical recommendations to Arkansas rice producers.
Author:
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 144
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Book Description
Author: John Ansley Godwin
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 238
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Book Description
Because of the evolution of herbicide-resistant weeds, such as barnyardgrass and red rice in rice, there is a need for alternative herbicide sites of action. Very-long-chain fatty acid (VLCFA)-inhibiting herbicides are not labeled for use in U.S. rice production; however, this site of action (SOA) has been used with success in Asian rice. The VLCFA-inhibiting herbicides pethoxamid, pyroxasulfone, acetochlor, and S-metolachlor were evaluated for rice tolerance and control of commonly problematic weeds in Arkansas rice at various rates and application timings. Pyroxasulfone and S-metolachlor were deemed unfit for use in rice production because of negative effects on rice visual injury, rough rice yield, height, shoot density, and heading. Pethoxamid and acetochlor were used with little detriment to the rice crop when applied no earlier than the 1-lf growth stage. Along with minimal rice injury, pethoxamid controlled barnyardgrass all season when used in a program with other common rice herbicides such as clomazone, imazethapyr, or quinclorac. Considering the minimal injury observed, pethoxamid and acetochlor should be considered for integration into U.S. rice production to represent a unique herbicide SOA to use in rotation, sequential application, or tank mixtures with other rice herbicides. Nomenclature: Acetochlor; pethoxamid; pyroxasulfone; S-metolachlor; barnyardgrass, Echinochloa crus-galli (L.) Beauv.; red rice, Oryza sativa var. sylvatica L.; rice, Oryza sativa L. Key words: weed control, herbicide-resistant weeds, herbicide sites of action.
Author:
Publisher:
ISBN:
Category : Rice
Languages : en
Pages : 448
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Book Description
Author: Troy Mullins
Publisher:
ISBN:
Category : Agricultural systems
Languages : en
Pages : 62
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Book Description
Author:
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 129
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Book Description
Author: R. E. Talbert
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 364
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Book Description
