The MidSouth Cotton Specialists’ Working Group has just released the 2026 Cotton Variety Guide for Plant Growth Regulation and a more in-depth publication entitled Plant growth regulator use in Mid-South Cotton.The in-depth publication includes a relatively new breakdown to managing plant growth that considers variety responsiveness; current and expected growing conditions; and plant size, measured by nodes. It is our hope that these baseline rates, presented in Table 2 of the in-depth publication, might take some of the guess-work out of the time to initiate treatments, when to make follow-up treatments, and how much to apply in each application. Please note that 1) the rates mentioned in the attached guide are for a 4.2% mepiquat chloride formuation; 2) a maximum single application should not exceed 24 oz per acre of a 4.2% mepiquat chloride product with a maximum season application rate of 48 oz per acre of a 4.2% mepiqaut chloride product; and 3) rates and initiations should serve as baselines but should be adjusted based on local expertise and past experiences that can be locationally specific.
