Cotton: I would start monitoring all squaring fields for tarnished plant bugs. The few fields that have had higher populations have been older cotton. The past trend is that earlier cotton is more susceptible to plant bugs. Pull the trigger if you are at or below 80% retention rate on your first position squares. We want 80% retention of first position squares. Max yield potential can still be achieved if you can keep 80% or higher retention of the first position fruit at bloom. Aphids are building in some fields. Whiteflies are present and building as well. Cotton is off to a pretty good start.
Peanuts: Crown Rot is still a problem but be on the look for white mold. I haven’t seen any yet but with temperatures starting to increase white mold could be on the horizon. Here is a good article on white mold control. https://site.extension.uga.edu/tiftcoag/2019/06/white-mold-in-peanuts/
Corn: Southern Corn Rust has made its way to Tift County. Southern Rust can cause heavy yield losses, Dr. Kemerait has had trials where an 80 bu/A difference was recorded. If you have younger corn I would be considering a preventive fungicide application. Tebuconazole can be a cheaper effective option but when you use products with mixed modes of actions, e.g. triazoles + strobilurins, or triazoles + strobilurins + SDHIs, or SDHIs + strobilurins, you increase efficacy, broad-spectrum activity, and protective windows. Remember, fungicides always work better preventatively, though ones mentioned above have some curative activity. Applying a good fungicide when rust is just getting established in a field can be effective.