Strongarm Applied Postemergence in Georgia Peanut E. P. Prostko, J.T. Flanders, S. Komar, E. Harrison Dept. Crop & Soil Sciences University of Georgia APRES 2004

Strongarm labeled in March 2000 PPI, PRE, AC broadleaf weeds 0.45 ozs/A $15/A 18% of GA acres in 04’ 10 month cotton rotation restriction

Objective To evaluate the performance of POST applied Strongarm on various weed species in GA.

Materials and Methods small plot techniques 3-4 replications 6 trials in 2003 3 on-farm 3 experiment station tropical spiderwort bristly starbur FL beggarweed annual mg wild poinsettia wild radish

Results

Tropical spiderwort control in peanuts with Strongarm @ 0 Tropical spiderwort control in peanuts with Strongarm @ 0.45 ozs/A, Grady Co., 2003. a ab a ab abc c EPOST = 17 DAP (2”, 3 leaf) LPOST = 31 DAP (up to 6”)

Tropical spiderwort control with POST applied Strongarm, 2003 Untreated Strongarm applied 17 DAP Strongarm applied 31 DAP PE-24-03 46 DAP

Bristly starbur control with POST applications of Strongarm, 2003 1-15” tall bristly starbur Included 80/20 @ 0.25% v/v

Bristly Starbur Control with POST Applied Strongarm Untreated Strongarm @ 0.45 ozs/A Strongarm @ 0.113 ozs/A PE-27-03 32 DAT

Strongarm POST Test - Growth Stages Ty-Ty, GA 2003

Annual morningglory control with POST applications of Strongarm - 11 WAP LSD 0.05 = 4 Averaged over 3 timings (1, 3, and 5 WAP)

Florida beggarweed control with POST applications of Strongarm - 11 WAP LSD 0.05 = 12 Averaged over 3 timings (1, 3, and 5 WAP)

11 WAP Strongarm 0.45 ozs/A + 80/20 @ 0.25% v/v (Applied 5 WAP) Untreated

Wild poinsettia control with POST applications of Strongarm ab ab bc bc c c bc bc d d Applied 21 DAP 1-3” tall; cot- 4 leaf weeds Included 80/20 @ 0.25% v/v Mitchell County, 2003

Wild poinsettia control with POST herbicides, 2003 Untreated Cadre @ 1.44 ozs/A Strongarm @ 0.45 ozs/A PE-15-03 67 DAT

Wild radish control with POST applied Strongarm (3-4 leaf) (7” rosette) (flowering) Included 80/20 @ 0.25% v/v 40 day after first timing LSD 0.05 = 11

Wild Radish Control with POST Applied Strongarm (1”, 3-4 leaf) Untreated Strongarm 0.45 ozs/A Strongarm 0.225 ozs/A 40 DAT

Summary good to excellent POST control of several species reduced rates on sensitive species such as bristly starbur, annual morningglory, wild radish timing is critical on some species such as beggarweed no POST control of sicklepod

Future Research variety tolerance crop rotations other weed species longer or shorter???? other weed species horseweed copperleaf eclipta

University of Georgia Extension Weed Science (gaweed.com)