by: Dr. Kemerait
Corn at tassel and beyond in extreme southern Georgia from Seminole Co to Clinch Co to Wayne Co but not yet yet north of Mitchell-Colquitt- Cook Counties is at high risk for southern rust and I would advise a fungicide application UNLESS you are thoroughly scouting and can’t find rust. I am sure rust is fixing to ignite in some fields and I expect to see a jailbreak north very soon. Keep the samples coming.
Peanuts– number 1 question now.,”Bob, it’s so hot and dry. Can I modify my fungicide program under these conditions?”
The answer is probably “yes” as long as you consider Peanut Rx and pay attention to changes predicted in the weather.
1. Growers can likely extend their leaf spot spray interval by a few days (17 or so days rather than 14).
2. Growers in hot and dry can likely substitute a chlorothalonil tebuconazole tank mix, or something similar, for early sprays.
3. Per phone call yesterday, we DO NOT recommend applying tank mixes of tebuconazole + Absolute Maxx, or azoxystrobin + Headline because of significant resistance risk.
4. Hot and dry stifles leaf spot to some degree, but the “hot” may actually fuel white mold. Now is not the time to slack off on white mold. I don’t mean a grower needs to throw everything at it, but I mean white mold could thrive.
