Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals
Corteva Agriscience recently registered a premix of tolpyralate and bromoxynil in the United States and Canada for weed control in cereal fields. Limited information exists on weed control efficacy and crop safety with this new herbicide premixture. Greenhouse trials were conducted for 2 yr to test...
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| Language: | English |
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Cambridge University Press
2025-01-01
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| Series: | Weed Technology |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S0890037X25000223/type/journal_article |
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| author | Seshadri S. Reddy Ignacio Gonzalez Rory Degenhardt David Ouse Norbert Satchivi Laura Creemer |
| author_facet | Seshadri S. Reddy Ignacio Gonzalez Rory Degenhardt David Ouse Norbert Satchivi Laura Creemer |
| author_sort | Seshadri S. Reddy |
| collection | DOAJ |
| description | Corteva Agriscience recently registered a premix of tolpyralate and bromoxynil in the United States and Canada for weed control in cereal fields. Limited information exists on weed control efficacy and crop safety with this new herbicide premixture. Greenhouse trials were conducted for 2 yr to test the efficacy of tolpyralate and bromoxynil combinations on 14 broadleaf and four grass weeds and its safety to wheat and barley. Four combinations of tolpyralate and bromoxynil at a 1:10 ratio (3.75 + 37.5, 7.5+ 75, 11.25 + 112.5, and 15 + 150 g ai ha−1) as a tank mix and premix were tested. Stand-alone treatments of tolpyralate and bromoxynil were also included in this study. The lowest tested rate of tolpyralate (3.75 g ha−1) provided 10% to 98% control of broadleaf weeds and 27% to 77% control of grass weeds. Bromoxynil at the lowest tested rate (37.5 g ha−1) provided 16% to 80% control of broadleaf weeds and 0% to 30% control of grass weeds. Tank mixing these two herbicides at the same rates resulted in improved broadleaf (60% to 100%) and grass (45% to 94%) weed control. The minimum recommended field use rate of tolpyralate + bromoxynil (15 + 150 g ha−1) controlled all the broadleaf weeds by >95%. That combination also controlled green foxtail, barnyardgrass, and large crabgrass by >90%. An additive or synergistic effect between the two herbicides was observed against several broadleaf and grass weed species. Among all the tested weeds, a greater synergistic effect was observed when the herbicides were used on kochia, chickweed, wild mustard, corn poppy, barnyardgrass, green foxtail, and fall panicum. The premix of the two herbicides provided similar control of broadleaf weeds, but better control of grass weeds than the tank-mix combinations. The premix can be used safely on wheat and barley. |
| format | Article |
| id | doaj-art-a7d8a18678ce43e09f512ba957a099e1 |
| institution | DOAJ |
| issn | 0890-037X 1550-2740 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Weed Technology |
| spelling | doaj-art-a7d8a18678ce43e09f512ba957a099e12025-08-20T02:45:31ZengCambridge University PressWeed Technology0890-037X1550-27402025-01-013910.1017/wet.2025.22Weed control and crop safety with premixed tolpyralate and bromoxynil on cerealsSeshadri S. Reddy0https://orcid.org/0000-0002-9601-3046Ignacio Gonzalez1Rory Degenhardt2David Ouse3Norbert Satchivi4Laura Creemer5Weed Scientist, Corteva Agriscience, Indianapolis, IN, USAField Sciences Leader, Corteva Agriscience, La Rinconada, SpainField Sciences Leader, Corteva Agriscience, Calgary, AB, CanadaHerbicide Biologist, Corteva Agriscience, Indianapolis, IN, USAGlobal Biology Leader, Corteva Agriscience, Indianapolis, IN, USAAssociate Investigator, Corteva Agriscience, Indianapolis, IN, USACorteva Agriscience recently registered a premix of tolpyralate and bromoxynil in the United States and Canada for weed control in cereal fields. Limited information exists on weed control efficacy and crop safety with this new herbicide premixture. Greenhouse trials were conducted for 2 yr to test the efficacy of tolpyralate and bromoxynil combinations on 14 broadleaf and four grass weeds and its safety to wheat and barley. Four combinations of tolpyralate and bromoxynil at a 1:10 ratio (3.75 + 37.5, 7.5+ 75, 11.25 + 112.5, and 15 + 150 g ai ha−1) as a tank mix and premix were tested. Stand-alone treatments of tolpyralate and bromoxynil were also included in this study. The lowest tested rate of tolpyralate (3.75 g ha−1) provided 10% to 98% control of broadleaf weeds and 27% to 77% control of grass weeds. Bromoxynil at the lowest tested rate (37.5 g ha−1) provided 16% to 80% control of broadleaf weeds and 0% to 30% control of grass weeds. Tank mixing these two herbicides at the same rates resulted in improved broadleaf (60% to 100%) and grass (45% to 94%) weed control. The minimum recommended field use rate of tolpyralate + bromoxynil (15 + 150 g ha−1) controlled all the broadleaf weeds by >95%. That combination also controlled green foxtail, barnyardgrass, and large crabgrass by >90%. An additive or synergistic effect between the two herbicides was observed against several broadleaf and grass weed species. Among all the tested weeds, a greater synergistic effect was observed when the herbicides were used on kochia, chickweed, wild mustard, corn poppy, barnyardgrass, green foxtail, and fall panicum. The premix of the two herbicides provided similar control of broadleaf weeds, but better control of grass weeds than the tank-mix combinations. The premix can be used safely on wheat and barley.https://www.cambridge.org/core/product/identifier/S0890037X25000223/type/journal_articleBromoxyniltolpyralatebarnyardgrass Echinochloa crus-galli (L.) Beauvchickweed Stellaria media Lcorn poppy Papaver rhoeas Lfall panicum Panicum dichotomiflorum Michxgreen foxtail Setaria viridis L. kochia Bassia scoparia Llarge crabgrass Digitaria sanguinalis Lwild mustard Sinapis arvensis Lbarley Hordeum vulgare Lwheat Triticum aestivum LHPPD-inhibiting herbicidePS II-inhibiting herbicidesynergy |
| spellingShingle | Seshadri S. Reddy Ignacio Gonzalez Rory Degenhardt David Ouse Norbert Satchivi Laura Creemer Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals Weed Technology Bromoxynil tolpyralate barnyardgrass Echinochloa crus-galli (L.) Beauv chickweed Stellaria media L corn poppy Papaver rhoeas L fall panicum Panicum dichotomiflorum Michx green foxtail Setaria viridis L. kochia Bassia scoparia L large crabgrass Digitaria sanguinalis L wild mustard Sinapis arvensis L barley Hordeum vulgare L wheat Triticum aestivum L HPPD-inhibiting herbicide PS II-inhibiting herbicide synergy |
| title | Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| title_full | Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| title_fullStr | Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| title_full_unstemmed | Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| title_short | Weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| title_sort | weed control and crop safety with premixed tolpyralate and bromoxynil on cereals |
| topic | Bromoxynil tolpyralate barnyardgrass Echinochloa crus-galli (L.) Beauv chickweed Stellaria media L corn poppy Papaver rhoeas L fall panicum Panicum dichotomiflorum Michx green foxtail Setaria viridis L. kochia Bassia scoparia L large crabgrass Digitaria sanguinalis L wild mustard Sinapis arvensis L barley Hordeum vulgare L wheat Triticum aestivum L HPPD-inhibiting herbicide PS II-inhibiting herbicide synergy |
| url | https://www.cambridge.org/core/product/identifier/S0890037X25000223/type/journal_article |
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