1. Continued Investigations on the Control of Tropical Spiderwort
J. Tim Flanders and Eric P. Prostko
University of Georgia
APRES
San Antonio, TX

2. Tropical spiderwort Commelina benghalensis
tropical Asia/Africa native
annual or perennial
seeds and rhizomes
above and below ground flowers
1,600-12,000 seeds/plant
alternate host of southern root-knot nematode
problem weed in other countries (Holm’s)

3. Tropical spiderwort How bad is it?????
Grady County, GA (2004)

4. Current Control Strategies in Peanut
row spacing
* twins vs. singles
residuals
* Dual Magnum
* Strongarm
POST’s
* Gramoxone Max
* Cadre
* Basagran
* Strongarm (?)

5. Tropical spiderwort control in peanuts with Dual Magnum applied preemergence, Grady Co., 2003.
Dual Magnum 1.33 pts/A

6. Tropical spiderwort control with Gramoxone Max + Dual Magnum Tank-Mixes
Gramoxone 5.5 ozs/A +
Dual 1.33 pts/A

7. A B
Tropical spiderwort control in peanuts. A = untreated; B
= Gramoxone Max + Dual Magnum applied 17 DAP.
Photos taken 49 DAP.

8. Strongarm in Peanut PPI or PRE thru cracking*
not labeled for POST use at this time but working on this issue
* cracking = soil displaced by germinating seedlings just prior to emergence

9. Tropical spiderwort control in peanuts with Strongarm @ 0
Tropical spiderwort control in peanuts with 0.45 ozs/A, Grady Co., 2003. a a ab cd
abc ab b c e
PRE = 5 DAP
EPOST = 17 DAP (2”, 3 leaf)
LPOST = 31 DAP (up to 6”)

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

11. Gramoxone Max + Basagran A good or bad idea?

12. Tropical Spiderwort control with Gramoxone + Basagran, 2003
Treatments applied 16 DAP
Gramoxone Max (5.5 ozs/A)
Basagran (8 ozs/A)
80/20 (0.25% v/v)
All data = NS (P = 0.05)

13. Tropical Spiderwort control with Gramoxone + Dual Magnum + Basagran, 2003
Treatments applied 16 DAP
Gramoxone Max (5.5 ozs/A)
Dual Magnum (1.33 pts/A)
Basagran (8 ozs/A)
80/20 (0.25% v/v)
All data = NS (P = 0.05)

14. What about peanut injury?
when Basagran was added to Gramoxone
20% less peanut injury
when Basagran was added to Gramoxone + Dual Magnum
9-14% less peanut injury

15. Gramoxone Max and Cadre Tank-Mixed or Split Applications?

16. Tropical spiderwort control with Gramoxone Max and Cadre, 2003
(LSD 0.05 = 11)
(LSD 0.05 = 15)
(LSD 0.05 = 22)
Tank-mix applied 17 DAP/Split applied 17 and 31 DAP

17. What About Cadre + Dual Combos?

18. Tropical Spiderwort Control with Cadre + Dual Magnum, 2003
114 DAP
LSD 0.05 = 22

19. What about Valor?

20. Tropical spiderwort control in peanuts with Valor applied preemergence, Grady Co., 2003.
Valor 51 3 ozs/A

21. Post-Harvest Control Test - 2003
October 31
after corn harvest
6” tall TSW
15 GPA
4 replications
% control - 14 DAT
frost at 14 DAT

22. Tropical spiderwort control with various herbicides - 14 DAT
Applied October 31, 2003
6” tall spiderwort
LSD 0.05 = 13

23. Where are we doing 2004?? PPI vs. PRE Strongarm Cadre vs Pursuit
split applications of Dual Magnum
2,4-D ?????
Corn lay-bys
Aim, Evik, Gramoxone Max, Starane
TSW in Peanut