Here’s a new article from our seed production research and extension team on the rate and timing of trinexapac-ethyl plant growth regulator (PGR) and its effects on seed yield and yield components in tall fescue (Schedonorus arundinaceus (Shreb.) Dumort.) seed crops.  The field trials were conducted in the Willamette Valley over a 6-year period at Hyslop Farm.

This article will appear in an upcoming issue of Field Crops Research and is a part of our series on PGR tools for use in grass and legume seed production.  The product is marketed around the world as Palisade, Moddus, and several generic products for lodging control in grass seed crops and legume seed crops.

Key findings of the article:


  • Trinexapac-ethyl reduced stem length and controlled lodging in tall fescue across six diverse lodging environments.
  • Trinexapac-ethyl consistently increased seed yield in tall fescue, but rate of application had no effect on yield.
  • Timing of trinexapac-ethyl applications had no effect on seed yield.
  • Seed yield increases resulting from trinexapac-ethyl were attributable to greater seed number and harvest index.


The article can be found at the link below:

Chastain, T.G., W.C. Young III, C.J. Garbacik, and T.B. Silberstein. 2015. Trinexapac-ethyl rate and application timing effects on seed yield and yield components in tall fescue. Field Crops Research 173:8-13.



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