Enhancement of Tolpyralate + Bromoxynil Efficacy With Adjuvants in Corn

John C. Fluttert, Nader Soltani, Mariano Galla, David C. Hooker, Darren E. Robinson and Peter H. Sikkema

Journal of Agricultural Science, 2024, vol. 14, issue 4, 39

Abstract: The most effective adjuvant is often herbicide-specific and dependent on the target weed species. Tolpyralate is a 4-hydroxyphenylpyruvate dioxygenase-inhibiting herbicide that is usually tank-mixed with atrazine for improved weed control in corn (Zea mays L.). Previous research has reported that a methylated seed oil (MSO) adjuvant (MSO Concentrate®) enhances the efficacy of tolpyralate + atrazine on several annual broadleaf and grass weed species. The efficacy of tolpyralate can also be improved with the addition of bromoxynil instead of atrazine; however, there is no information in the peer-reviewed literature that tests the efficacy of tolpyralate + bromoxynil with different adjuvants. Therefore, four field trials were conducted in 2020 and 2021 in Ontario, Canada to evaluate the efficacy of tolpyralate + bromoxynil without an added adjuvant and with MSO Concentrate®, Agral® 90, Assist® Oil Concentrate, Carrier®, LI 700®, or Merge® on six annual weed species in corn. The adjuvants did not enhance control of wild mustard (Sinapis arvensis L.) or velvetleaf (Abutilon theophrasti Medik.) with tolpyralate + bromoxynil. At 8 weeks after application (WAA), common ragweed (Ambrosia artemisiifolia L.) control was improved with the addition of MSO Concentrate® or Merge® to tolpyralate + bromoxynil. At 8 WAA, all adjuvants enhanced the control of common lambsquarters (Chenopodium album L.) with tolpyralate + bromoxynil similarly except for Assist® Oil Concentrate; Merge® was a better adjuvant than Assist® Oil Concentrate for common lambsquarters control. At 8 WAA, control of barnyardgrass [Echinochloa crus-galli (L.) P. Beauv.] was enhanced with the addition of Assist® Oil Concentrate, Carrier®, MSO Concentrate®, or Merge® to tolpyralate + bromoxynil. Carrier®, MSO Concentrate®, and Merge® enhanced the efficacy of tolpyralate + bromoxynil on Setaria spp. at 8 WAA. Control of velvetleaf, wild mustard, common ragweed, Setaria spp., and barnyardgrass with tolpyralate + bromoxynil was similar with the six adjuvants evaluated at 8 WAA.

Date: 2024
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