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Fall Weed Control and Fall Tillage Practices for Thistle
Fall tillage to control annual weeds should be shallow to avoid burying seeds. For effective fall thistle control spray regrowth after harvest and leave undisturbed for three weeks. Cultural practices can then proceed. Chemicals suitable at low cost include Kilmer MCPA amine sodium salt Target and 2 4 D amine or LU ester. Higher perennial thistle control comes from Amitrol T Banvel 5G and Roundup with patch treatment recommended due to cost. For these to work, tle plants must be growing. Rates are in the Guide to Chemical Weed Control. Typically ten gallons of water per acre apply, except Amitrol T and Banvel. Roundup has fall use for hard to control weeds. Monsanto approved a reduced rate in fall for quackgrass. It is labeled as Season Agriculture Today Long Control with 2.5 L/ha in 50 to 100 L/ha water using flat fan nozzles. Previous rates of 4.75 to 7 L/ha are called Long Term Control. Reduced rates suppress one crop cycle. higher rates kill most established plants, but reinfestation may occur years later. Growers should weigh one-half rate annually versus full rate every 2 or 3 years.