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DOES MY WHEAT NEED A PLANT GROWTH REGULATOR?

Eddie McGriff

Alabama Extension Regional Agent

 

Wheat fields that are at risk from lodging may benefit the most from a plant growth regulator. These fields may be at risk from lodging due to excessive nitrogen being applied; high seeding rates; varieties that are prone to lodge; or around the turn rows where nitrogen applications may have overlapped. Palisade EC is the plant growth regulator we have the most research and experience with in wheat. The active ingredient in Palisade is Trinexapac-ethyl.

The optimum time to apply Palisade is at the onset of stem elongation and before the emergence of the flag leaf. The use rate is one gallon to 9-12 acres with 11 acres per gallon being the most common. Palisade interferes with the biosynthesis of gibberellic acid to prevent cell elongation, which shortens the internodes and strengthens the stem. The wheat stem is shorter and thicker which can reduce lodging and improve yields. It is foliarly absorbed and suppresses but does not inhibit growth. Palisade will tank mix with most fertilizers, herbicides, fungicides and insecticides but do a jar test if it is not on the label.   

Oskie is a plant regulator labeled to minimize lodging in wheat. We have far less research and experience with Oskie than Palisade. The active ingredient in Oskie is Ethephon. Oskie should be applied at the point the flag leaf is slightly visible to the boot stage. Crop damage and decreased yields may occur if application contacts exposed heads. There are several tank mix precautions with Oskie so please read the label carefully if you decide to use Oskie.

Eddie McGriff is the NE Alabama Regional Agent for row crops. He can be contacted at 256-557-2375 or e-mailed at dem0029@auburn.edu.


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