Cotton planted in Thomas County is presently in several different growth stages, from just a few true leaves to bloom. Growth has improved now that we have gotten some rain and temperatures have decreased. Now that our cotton is growing again we need to control vegetative growth in order for the plant to allocate resources toward the fruiting structures on the plant. Mepiquat is one tool that is specifically used to manage “rank” vegetative growth. This shortens the plant’s internodes, reduces leaf area, reduces carbohydrate stress, and contributes to earlier maturity. Some things to consider when applying PGR’s in cotton are: growth stage, growth rate, pest control, and anticipated growth based on field history and management practices. Low rate applications can be made during the second week of squaring in irrigated fields and apply on a 14 day interval up to 4 times. A more aggressive approach is to apply 8-12 oz. per acre at first bloom and make a second application two to three weeks later. In dryland cotton, applying 8 oz. per acre at first bloom and potentially follow with subsequent applications.
In peanuts, growth regulators are seldom used, but can be beneficial. Prohexadione calcium, or Apogee or Kudos, are the only growth regulators registered for peanut applications. Some positive results from using Apogee included reduced vine length. This allowed for increased efficiency during digging, however, there was no consistent yield increase. If you think that this may be helpful to you, 7.25 oz. per acre should be applied once 50% of lateral vines are touching and then applied again 2-3 weeks later. Timing of these applications is very important and should only be used on irrigated peanuts. Our peanut scientists are still researching the use of these products so more information will be available soon. Please contact me at the extension office with any questions.