How effective are the NSAs?

A 2010 trial compared the WeedWiper to the TopCrop Sponge. “The pigweed was 66 inches tall, on average. We were using a 50 percent solution of Gramoxone Inteon — that’s what we’re focusing on in Georgia, right now.”

Another study looked at the WeedWiper and LMC-Cross Wick — again using a 50 percent solution of Gromoxone Inteon.

“This fall, we were able to get a later trial in. The pigweeds were a bit smaller at a 34-inch average — although 34 inches is still pretty tall. Both implements were pretty effective in managing those larger populations.

“It’s interesting because we know that Gramoxone isn’t a translocated material, generally. But we’re seeing movement down in the lower portions of the plant. And we’ve gotten almost complete control in some cases.”

Summary of Palmer Amaranth control (percentage) with non-selective applicators using Gramoxone Inteon

Trial#

Rating Date (DAT)

Gravity Flow Wick

Weed Wiper

Wick Master

Top Crop Wiper

LMC-Cross Wick

LSD (0.10)

1

10

63

86

-

-

-

9

2

14

-

90

-

-

-

-

3

18

-

90

-

-

-

-

4

24

-

99

   69

-

-

4

5

29

-

99

-

  99

-

NS

6

28

-

92

-

-

 85

3

Summarizing the data, so far, “I believe we have eight to 10 field trials. We’re certainly on a learning curve trying to conduct research with these type of implements. They’re all pretty much custom-made.”

Prostko and colleagues have collected the most data on the WeedWiper, which provides over 90 percent control.

“The GravityFLow wasn’t effective in one trial. The WickMaster was also less effective. The Top CropWiper was up there with 99 percent control. The LMC-Cross wickbar gave us about 85 percent control up to 30 days after treatment. Again, (those results) are from using a 50-50 solution of Gramoxone Inteon and water with the exception of trial four. You can see from these numbers there’s certainly potential for these implements to be utilized.”

Herbicides other than Gramoxone have been used with the NSAs.

“We have tried Ignite and Cobra in some of these systems. Neither one, in my opinion, is effective in NSAs. At least that’s true at this point — we may change our minds after more study. But I don’t feel comfortable telling anyone that Ignite or Cobra is effective in an NSA.”