· Burndown options – Plan on two burndown applications of Roundup, Touchdown, Paraquat, or Liberty. A second application may not be needed but always plan on two. Use full rate of herbicide along with extra surfactant and acidifier or ammonium sulfate as appropriate. Spraying in the morning may result in better translocation. Cool, cloudy weather may reduce translocation. Do NOT mix products that cause leaf burn such as atrazine or 28% nitrogen with burndown herbicides as less product will be absorbed. Rotate herbicide mode of action to prevent resistance.
· Residual weed control – Roundup mixed with Princep works as both a burndown, prevents annual ryegrass from resprouting (provided there is moisture for Princep uptake), and provides residual weed control. Atrazine can be applied 7-14 days after burndown. Post applied herbicide options are: Accent, Option, Steadfast, Lightning, and Liberty. Other post applied grass herbicides can control the annual ryegrass but may cause crop injury.
Tags: burndown, cover crop, Round Up, translocation of herbicides
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