1. 2018 Sweet Corn Weed Control
Herbicide active ingredients: > 18
Tillage
Cover crops
Hand weeding
Numerous weed management options exist for sweet corn producers. In fact, of all the vegetables produced in Georgia more options exist in sweet corn than any other cropping system. Read slide

2. No Emerged Weeds At Planting
Tillage
Cover Crop
Burndown

3. Preemergence! BURNDOWN: Roundup (3 d preplant) Gramoxone Aim
For ryegrass: Roundup fb by Gramoxone
For horseweed: 2,4-D applied 7-14 d preplant.

4. Apply PRE right after seeding!
Atrazine (~1 qt/A) + Dual II Magnum (~1 pt/A)
Dual and numerous alachlor products are available……….Dual II includes a safener which can make difference on sweet corn

5. Apply PRE right after seeding!
POST OVERTOP
Atrazine + Prowl (early POST through 12”)
Atrazine + Laudis (data looks great)

6. Percent Texas Millet Control at Harvest In Conventional Sweet Corn
Percent Texas Millet Control at Harvest In Conventional Sweet Corn. TyTy, GA.
97 a
97 a
78 b
36 c
Four common systems to control Texas millet (our most challenging grass) potentially used in Georgia point out the value of Laudis herbicide which is a relatively new tool for sweet corn producers. Laudis is extremely safe and effective on small grasses when used correctly. Our favorite program would be Bicep II Magnum (Dual II Magnum + Atrazine) PRE followed by Laudis POST if possible.
PRE
Atrazine
Prowl + Atrazine
Atrazine
Laudis
Bicep II Mag
Prowl + Atrazine
Bicep II Mag
Laudis
POST
Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Laudis 3 oz/A.

7. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
Discuss photo’s
Atrazine PRE
Atrazine + Prowl POST
Bicep II Magnum
Prowl + Atrazine POST

8. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
Discuss photo’s
Atrazine PRE
Laudis + MSO 3” millet
Bicep II Magnum
Lauidis + MSO 3” millet

9. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
Laudis must be applied timely or just like any other herbicide it will not work effectively.
Non-treated control
Laudis 3 oz + MSO to 6” millet

10. Laudis 3.5 SC active ingredient = Tembotrione
field corn, seed corn, sweet corn and popcorn
controls crabgrass, goosegrass, broadleaf signalgrass, and Texas panicum (millet) up to 3 inches
Read slide

11. Laudis 3.5 SC do not apply to Merit or Shogun cultivars
3 oz product per acre from emergence to V7
include an MSO (methylated seed oil)
can tank mix with atrazine
only one application
Read slide

12. Laudis: Carryover Concerns?
Label
4 months: grains
8 months: soybean
10 months: cotton, tomato, snapbean
18 months: cucurbits, other crops
UGA has limited carryover data!
The greatest limitation with Laudis is the potential for carryover. We believe these rotational intervals may be greater than needed for our region and are working with Bayer Crop Science to better understand how “real” these concerns are. Regardless always follow the label and if data is generated to reduce rotational interval then we will let you know immediately.

13. Apply PRE right after seeding!
POST OVERTOP
Atrazine + Prowl (early POST through 12”)
Atrazine + Laudis (data looks great)
Callisto and Impact also labeled…less tolerance in our research.

14. Plowing Destroys the Herbicide Layer
If you plow, products like Dual Magnum, Prowl and/or Atrazine applied after plowing would be beneficial.

15. Roundup WMAX On Sweet Corn
Emergence through 8 leaf collars or 30” whichever comes first.
One application of WMAX at 32 oz/A + atrazine prior to 12 inch corn
Two applications of WMAX at 22 oz/A if avoiding atrazine for carryover concern.
Max use rate 44 oz/A, don’t exceed 4.1 qt/A.
10 d between application, 30 d PHI
Read slide

16. Grasses should not be issue in RR Sweet Corn
Read slide
Non-treated Control

17. Percent GR Palmer amaranth Control at Harvest In RR Sweet Corn
Percent GR Palmer amaranth Control at Harvest In RR Sweet Corn. TyTy, GA.
99 a
99 a
99 a
78 b
Regardless numerous options exist with or without atrazine to control Palmer amaranth.
PRE
None
RU WMax
Atrazine
RU WMax
Dual II Mag
RU + Atrazine
Bicep II Mag
RU + Atrazine
POST
Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Dual II Mag. 1 pt; WMax 1 qt per acre.

18. Percent Morningglory Control at Harvest In RR Sweet Corn. TyTy, GA 2012.
83 b
75 c
Similarly, numerous programs are effective for morninglory although you can clearly see atrazine is an important tool if one is to achieve excellent morningglory control.
PRE
None
RU WMax
Atrazine
RU WMax
Dual II Mag
RU WMAX
Dual II Mag
RU + Atrazine
Bicep II Mag
RU + Atrazine
POST
Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Dual II Mag. 1 pt; Laudis 3 oz; WMax 1 qt per acre.

19. Roundup WMAX On Sweet Corn
Glyphosate-resistant Palmer amaranth world
Residual applied at planting (Dual II + atrazine)
Residual tank mixed with Roundup
Does offer more flexibility in cropping systems
RR sweet corn has to be managed appropriately……read slide

20. Nutsedge in Sweet Corn
RR System: Sequential applications of Roundup and Sandea (top notch)
Conventional Corn: Sandea 0.67 oz/A from spike through layby. “Injury is responsibility of grower”.
We also need to discuss nutsedge. Vegetable growers should definitely take the opportunity to control nutsedge in sweet corn since it is so hard to control in other vegetable crops. In Roundup Ready cotton sequential applications of Roundup and Sandea is best. In conventional sweet corn, Sandea plus surfactant is very good.