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Tips for planting proso milletBy Randy Buhler CSU Cooperative Extension, Logan County agent, agronomy) Colorado The sequence of showers in May has provided excellent soil profile moisture. For those who plan to plant proso millet, the outlook is good. Weed competition can be expected to be more than it has the past few years. Proso has a very limited number of herbicides available for weed control. The chemicals labeled for proso millet are 2,4-D; carfentrazone-ethyl (Aim); dicamba (Clarity) and prosulfuron (Peak). Atrazine is no longer labeled for weed control in millet. Proso millet is a poor competitor with weeds during its seedling to five-leaf stage. Herbicides should be applied before weeds are four inches tall and proso is past the five-leaf stage. Proso becomes progressively more competitive after the five-leaf stage. Not all 2,4-D products carry proso millet on their label. Failure to use a proso labeled product will become a bigger problem if you have an injury claim after applying 2,4-D. You will have no claim against any unlabeled product manufacturer. The University of Nebraska Extension weed management guide recommends using 1 pint of 4 pound per gallon formulation of 2,4-D amine in the 3-5 leaf stage of proso millet. Expect crop injury if the proso is earlier or later than the 3-5 leaf stage. Expect injury when plants are heat or drought stressed. Clarity can be added to 2,4-D to improve control of kochia and wild buckwheat. Injury is more likely with this combination than with 2,4-D alone. Use 0.75 pint of 4 pound 2,4-D amine with 4 fluid ounces of Clarity per acre. Observe the 3-5 leaf growth stage of proso millet as the proper timing for application. Application before or after can increase injury. Plants injured by 2,4-D and/or Clarity will have poor root structure, flop over on the ground, and fail to grow. Roots that would develop at the crown stop growing. Small nubs may be present. Applications later than the 5-leaf stage may affect the formation of seed heads. Peak will provide a longer season of weed control with some soil residual. Observe the 22-month plant back restrictions for sunflowers before using this herbicide in your cropping rotation. Peak is added to 0.75 pint of 4 pound 2,4-D amine at 0.38 to 0.5 ounces per acre. Peak requires the use of 1 quart per 100 gallons spray solution (0.25 percent v/v) of non-ionic surfactant. Peak plus 2,4-D amine provided 80 percent control of buffalobur in a Nebraska study. Aim can be used to improve buffalobur control when mixed with 2,4-D or 2,4-D plus Clarity. Add Aim at 0.5 ounces per acre to the previously mentioned rates. Aim provided 93 percent control of buffalobur when added to 2,4-D amine. Aim provided 85 percent control when added to the 2,4-D plus Clarity mix. Aim can improve kochia and Russian thistle control during drought conditions. Under our current conditions, Aim would not be expected to improve control of kochia and Russian thistle. Aim also requires the addition of 1 quart per 100 gallons spray solution of non-ionic surfactant. Aim does not translocate, unlike the other products. Good foliage coverage with your spray is essential to get good control with Aim. For foxtail or pearl millet, Aim is now labeled for use as are some formulations of 2,4-D. Injury has been a big problem with 2,4-D on forage millet. Aim has little risk for crop injury on the forage millets. Follow label directions carefully, especially as to timing and need for a non-ionic surfactant. Date: 6/28/07
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