NDSU Crop and Pest Report
Weeds


ISSUE 6  June 5, 2003

ILLEGAL GLYPHOSATE APPLICATIONS ON ROUNDUP READY CROPS

The North Dakota and Minnesota Departments of Agriculture have issued regulatory alerts cautioning people who have purchased Genesis herbicide (EPA Reg. No. 70829-2), from Farm Advantage, Belmond, IA with the intention of applying on Roundup Ready crops. Use of Genesis on Roundup Ready crops is not allowed by the product labeling.

Many other glyphosate formulations, including Genesis do not have labeling allowing use on Roundup Ready crops and are not registered in North Dakota, so distribution, sale, offering for sale, and use of the product in North Dakota is prohibited. Use only registered pesticides, and use all pesticide products according to label directions. Please refer to the North Dakota pesticide registration database to determine which pesticides are registered.

http://www.kellysolutions.com/nd/  

As always, contact the North Dakota Department of Agriculture with any questions or concerns.

Jim Gray
Pesticide Registration Coordinator
ND Department of Agriculture

 

LEAFY SPURGE HAS MEET ITS MATCH

Rod Lym, NDSU Weed Scientist, has found a combination of herbicides that extends leafy spurge control for more than one year. Several years of field research has validated the consistency of results and county are using this treatment in their noxious weed spraying program and finding excellent results. Several herbicides control leafy spurge temporarily but soon new shoots emerge and the infestation continues to expand. This treatment provides excellent control for more than 1 year.

The herbicide treatment is:

Tordon @ 1 pt/A + Plateau @ 4 fl oz/A + 2,4-D @ 1 qt/A + MSO type adjuvant @ 1 qt/A

All components are necessary to achieve adequate control. Below is a summary of leafy spurge control from several years of research:

 

Leafy spurge control

3 MAA

12 MAA

15 MAA

--------- % control ----------

Tordon + 2,4-D

75

48

0

Tordon + Plateau + 2,4-D + MSO

92

83

75

MAA = months after application

 

HERBICIDE UPDATE - PART 3

Callisto (Syngenta)

a.i.: mesotrione

Crops: Corn

Comments: Latest Callisto label allows a 10 month rotation to alfalfa. Aerial application has been deleted and is no longer an approved application method.

A ND 2ee label was submitted and approved allowing a Callisto + Buctril tankmix. See label for information on rates, additives, timing, and weed controlled.

Lumax (Syngenta)

a.i.: mesotrione + s-metolachlor + atrazine

Crops: Corn

Comments: Positioned in mid-west as a soil applied herbicide at 6 pt/A which contains 0.75 lb atrazine. Section 2(ee) labeling allows POST application at 5 to 6 pt/A with Accent or Steadfast for grass and broadleaf weed control. NDSU research has shown excellent weed control from Steadfast + Lumax at 2.5 to 3 pt/A + petroleum oil adjuvant. Lumax at 3 pt/A contains the equivalent of 3 fl oz of Callisto, 1 pt of Dual II Magnum, and 0.38 lb ai/A atrazine. NDSU research has shown most crops can be planted the year following 0.38 lb ai/A atrazine. However, Lumax has several crop rotation restrictions. See page 115 of the 2003 ND Weed Control Guide for a list of crop rotation restrictions. See label for additional information. Only NIS and petroleum oil adjuvants are allowed with Lumax. NDSU research has shown the Dual II Magnum provides additional adjuvant enhancement of weed control.

Lumax has excellent corn safety, controls many broadleaf weeds including large common lambsquarters, buckwheat, increases yellow foxtail control, and has a restriction crop rotation restriction. High soil pH increases rate of breakdown.

Option (Bayer)

Mode of action: ALS inhibitor

a.i.: foramsulfuron + safener (35+35 DF)

Crops: Corn

Comments: An SU herbicide applied POST will control many grass and broadleaf weeds. Short residual with no cropping rotation restriction the following year. Weaknesses in weed control include Polygonum species like wild buckwheat and smartweed. Controls many broadleaf species including nightshade species which is different from most other sulfonylurea herbicides. May be sold in future with iodosulfuron in premix to improve weed control. Safener may reduce or eliminate injury from dicamba/Distinct when applied in tank-mixture. Apply ONLY with an MSO adjuvant at 1.5 pt/A + 28% nitrogen at 1.5 qt/A.

Raptor (BASF)

Mode of action: ALS inhibitor

a.i.: imazamox

Crops: Dry pea

Comments: Must be applied with either Basagran or Rezult to safen (antagonize) Raptor.

Steadfast (DuPont)

Mode of action: ALS inhibitor

a.i.: nicosulfuron + rimsulfuron

Crops: Corn.

Comments: Use on corn varieties of 77 to 88 CRM has not been allowed. However, DuPont now allows use of Steadfast, Accent Gold, and Basis Gold on corn that is no more than 12 inches tall, or less than or equal to 5-collar corn, which ever is most restrictive. Use caution with these products on short season corn varieties. Follow crop rotation restrictions.

Steadfast ATZ (DuPont)

Mode of action: ALS inhibitor + Ps inhibitor

a.i.: nicosulfuron + rimsulfuron + atrazine

Crops: Corn.

Comments: A premix that combines the equivalent of 0.75 oz DF/A Steadfast with 0.75 lb ai /A in the 14 oz DF/A use rate. Because of the atrazine application timing is limited for corn up to 12 inches tall. Adjuvant requirements are the same as Steadfast alone. Several broadleaf tankmixes are available. Refer to label for crop rotation restrictions. Follow crop rotation restrictions.

Yukon (Monsanto)

Mode of action: ALS inhibitor + plant growth regulator

a.i.: halosulfuron 12.5% + dicamba 50%

Crops: Corn.

Comments: Use rate of 4 oz/A provided equivalent rate of 0.67 oz/A of Permit + 4 fl oz/A of Banvel. Apply POST from emergence through 36 inch tall corn. Add NIS at 0.5% v/v or petroleum oil adjuvants at 1% v/v. Nitrogen fertilizer can be added if required. Rainfast within 4 hours. Permit component controls some large-seeded broadleaf weeds AND is very effective on yellow nutsedge.

 

Richard Zollinger
NDSU Extension Weed Specialist
rzolling@ndsuext.nodak.edu


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