TRIAL NOT COMPLETED. IT WILL BE CONDUCTED IN 2023.

Evaluation of early postemergence (EPOST) rice herbicides in ‘Tuber’ wild rice. Two trials, with data combined across sites. Yield data collected at only one location.  Cyhalofop: Clincher CA applied once over 1-2 leaf wild rice at 15 or 30 fl oz/a (0.28 or 0.56 lb ai/a) with crop oil concentrate. Minor, transient injury after application (<5%). Yield not different from highest value in the trial.  Weed control generally not different from carfentrazone standard.  Florpyrauxifen:  Loyant applied at 21 or 42 fl oz/a (0.034 or 0.068 lb ai.a) with methylated seed oil. Treatments were applied twice, ~14 days apart, beginning when crop was at 2 leaf stage.  Slight transient injury after application (<4%).   Weed control for most weeds not different from carfentrazone standard.  Pondweed control significantly better than carfentrazone at later evaluations. Florpyrauxifen treatments provided two highest yield values in the trials.  Penoxsulam:  Granite SC applied once over 1-2 lf wild rice at 2.8 or 5.6 fl oz/a (0.044 or 0.088 lb ai/a) with cop oil concentrate.  Good to excellent control of most weeds was observed but both rates cause severe leaf burn and stand loss, which resulted in yield losses of 86 and 97%, compared to highest value.  Triclopyr:  Grandstand CA was applied at 16 or 32 fl oz/a (0.375 or 0.75 lb ai/a) with crop oil concentrate.  Treatments were applied twice, 7 days apart, starting when crop was 3-4 leaf stage. Both rates caused high to very high crop lodging  which contributed to reduced yields of 14 and 55%, compared to the highest yield value. Weed control generally not better than the carfentrazone standard treatment but was significantly greater than carfentrazone for pondweed at later evaluations.  Propanil:  Superwham applied once over < 4 leaf stage wild rice at 96 or 192 fl oz/a (3 or 6 lb ai/a) with crop oil concentrate.  Except for early, transient chlorosis, little to no injury and no crop injury from either rate.  Other than significantly greater pondweed control at later evaluations, weed control not different from carfentrazone standard. Yield also not different from carfentrazone standard.

Evaluation of early postemergence (EPOST) rice herbicides in ‘Tuber’ wild rice. Two trials, with data combined across sites. Yield data collected at only one location.  Cyhalofop: Clincher CA applied once over 1-2 leaf wild rice at 15 or 30 fl oz/a (0.28 or 0.56 lb ai/a) with crop oil concentrate. Minor, transient injury after application (<5%). Yield not different from highest value in the trial.  Weed control generally not different from carfentrazone standard.  Florpyrauxifen:  Loyant applied at 21 or 42 fl oz/a (0.034 or 0.068 lb ai.a) with methylated seed oil. Treatments were applied twice, ~14 days apart, beginning when crop was at 2 leaf stage.  Slight transient injury after application (<4%).   Weed control for most weeds not different from carfentrazone standard.  Pondweed control significantly better than carfentrazone at later evaluations. Florpyrauxifen treatments provided two highest yield values in the trials.  Penoxsulam:  Granite SC applied once over 1-2 lf wild rice at 2.8 or 5.6 fl oz/a (0.044 or 0.088 lb ai/a) with cop oil concentrate.  Good to excellent control of most weeds was observed but both rates cause severe leaf burn and stand loss, which resulted in yield losses of 86 and 97%, compared to highest value.  Triclopyr:  Grandstand CA was applied at 16 or 32 fl oz/a (0.375 or 0.75 lb ai/a) with crop oil concentrate.  Treatments were applied twice, 7 days apart, starting when crop was 3-4 leaf stage. Both rates caused high to very high crop lodging  which contributed to reduced yields of 14 and 55%, compared to the highest yield value. Weed control generally not better than the carfentrazone standard treatment but was significantly greater than carfentrazone for pondweed at later evaluations.  Propanil:  Superwham applied once over < 4 leaf stage wild rice at 96 or 192 fl oz/a (3 or 6 lb ai/a) with crop oil concentrate.  Except for early, transient chlorosis, little to no injury and no crop injury from either rate.  Other than significantly greater pondweed control at later evaluations, weed control not different from carfentrazone standard. Yield also not different from carfentrazone standard.