Choosing post-emergence soybean herbicides for weeds like marestail, common ragweed, waterhemp and giant ragweed involves multiple decisions.

Palmer amaranth has to date been found in about 11 Ohio counties, but there isn’t any real pattern to the distribution, says Ohio State University Extension.

Dicamba, Liberty and atrazine are the most effective options for controlling marestail post-emergence in corn, and atrazine alone may not kill larger plants.

Mark Loux of Ohio State Univeristy presents soybean burndown options for control of marestail.

Applying large amounts of lime can result in fairly rapid and substantial increases in soil pH at shallow soil depths. Although the lime eventually moves deeper into the soil profile, and the pH at the soil surface equilibrates and decreases somewhat, the temporary increase in pH can have consequences for the persistence and activity of herbicides applied this spring.