Location: Sugarcane Research Unit
Title: Sugarcane ripener update Author
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: February 14, 2014
Publication Date: N/A
Technical Abstract: The chemical sugarcane ripeners glyphosate and trinexapac-ethyl play an important role in the Louisiana sugarcane industry. Their use allows for earlier starts to the sugarcane harvest season, increase recoverable sucrose (TRS) at the mill, and increases harvest efficiency. Response to ripeners often depends on variety and with the introduction of a new ripener, trinexapac-ethyl, research is needed on response of sugarcane varieties in Louisiana to these ripeners. Two trials evaluating the response of 11 sugarcane varieties to glyphosate (0.187 lbs ae/acre) and trinexapac-ethyl (0.18 lbs/acre) were conducted in 2013. Glyphosate application increased TRS in all varieties tested in 2013. The largest increase was in the variety L 01-299 where TRS was 57 lbs/ton greater with glyphosate application compared to nontreated L 01-299. The smallest increase (10 lbs/ton) was in the variety HoCP 05-902. Trinexapac-ethyl increase TRS in 6 of the 11 varieties in these two trials. Response was generally less than with glyphosate, ranging from an increase of 14 to 25 lbs/ton. Additional trials evaluating the response of sugarcane variety HoCP 96-540 to glyphosate and trinexapac-ethyl applied alone and as tank-mixes using reduced rates of glyphosate were conducted in 2012 and 2013. Combinations of glyphosate and trinexapac-ethyl resulted in similar increases in TRS without as great of a reduction in cane yield. Reducing the rate of glyphosate, in combination with trinexapac-ethyl would reduced injury to subsequent crops and could extend the treatment to harvest window for ripener application. Further research needs to be conducted with sugarcane varieties and glyphosate and trinexapac-ethyl tank-mixes in order to develop recommendations for their use.