ISSUE 1    May 4, 2006

ERRORS IN THE 2006 ND WEED GUIDE

Due to oversight, Milestone is incorrectly listed in some places in the weed guide.

Page 49 - Milestone is correctly listed here in CRP.

Page 54 - CRP should be included in the "Weed Location" column for both diffuse and spotted knapweed, yellow starthistle, and also for Russian knapweed.

Page 59 - CRP should be included in the "Weed Location" column ONLY for Milestone, not Transline.

Page 60 and 61 - "Not for CRP" should be deleted in the "Weed Location" and "Remarks and Paragraph" columns.

Page 114 - "0" should deleted and replaced with a "B" in every column for rotation to EVERY crop. Sorry for the inconvenience.

 

QUESTION

What are some herbicides that will give good curly dock control in small grains, peas, and flax? I have had a number of calls this week from agents and producers wondering about curly dock control in-crop. Many have asked if Spartan would. With all the water last June, curly dock has become established across many fields this spring.

Answer. The most conducive environment for curly dock is moisture and wet conditions. Seed moves with water and seedlings can quickly establish and infest wet areas. Curly dock is in the Polygonum (smartweed) family, is a perennial with a somewhat branched taproot, and is susceptible to any herbicide containing clopyralid (Stinger).

Several herbicides give excellent dock control in grass crops. Some effective herbicides are Affinity, Curtail/M, dicamba, Distinct, Hornet, Stinger, and Widematch. 2,4-D, MCPA, Buctril and Bronate will not control dock.

Glyphosate will control dock but requires high rates and possibly sequential applications. Since dock becomes visible early in the spring a preplant application of glyphosate can reduce or eliminate the infestation.

Control of dock in broadleaf crops is more difficult. Sencor (metribuzin), Pursuit, Raptor, and glyphosate (RR crops) are herbicides labeled for control. Refer to the label for registered crops, use rates, adjuvant use, timing, and special instructions. For example, fall applications of Pursuit gives better control than spring applications. Pursuit applied alone and in the spring did not provide acceptable control. Spring applications provides 20 to 45 percent less control than the fall applications. Be cautious of the Sencor (metribuzin) rate used because high pH soil greatly enhances the activity and can lead to crop injury. Spartan is a preemergence herbicide and will not control emerged plants. Spartan will not control un-emerged curly dock. This is not surprising since Spartan gives erratic wild buckwheat control which is also in the Smartweed family.

Richard Zollinger
NDSU Extension Weed Specialist
r.zollinger@ndsu.edu


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