Should You Leave Simazine Out With Later No-Till Corn Plantings?

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

In the past, it was recommended to use simazine (Princep) when the cornfields were sprayed early. I have been asked whether it is worthwhile to include simazine as a component of no-till spray mixes for later planted corn. Princep will not control emerged grasses, but it will provide residual control. Be sure to include paraquat or glyphosate to control the grasses that have already emerged, then simazine will be there to control later emerging grasses. In fields with a history of crabgrass and fall panicum problems, it is a good idea to include simazine even with later plantings.

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