NDSU Extension Service - Ramsey County

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September 10, 2012 Agriculture Column

Howdy!!!

The weather is feeling more and more like fall each day.  Dad was visiting in Warwick (Marvin and sister Linda’s ranch on Sunday and said they had received some frost in the low lying areas.  Dad said the soybeans were definitely affected, which would help speed up the maturity of the soybean crop.  The edible harvest is rapidly moving along with many fields harvested and soybeans are not far behind.  Unbelievably, the corn could also be ready to harvest for some during the soybean harvest.  The growing degrees have progressed very nicely this summer, as we all know, to the point of a very good fall corn harvest.  The GDD’S are now at 2079 compared to the average of 1856 degree days.  This number would put corn that was planted May 1 and earlier either at black layer or very close to black layer meaning that a frost would not hurt the corn.  One last note for the cattle producers; I am in the process of buying a hay probe for you to check the quality of your hay.  Many of you baled CRP hay this year and that hay will very likely be of poor quality meaning supplements will be needed to meet the demands of the cow and calf.  I hope to have that probe in the next couple of weeks.  A portable electric drill will operate the core sampler to make it much more efficient to operate.

Foxtail barley has become an ever increasing problem for growers across North Dakota.  I have been investigating different herbicides to use for the suppression and/or control of foxtail barley.  Below you find the first of my comments about a possibility that will help you control foxtail barley.  Keep in mind we have all been using Glyphosate for many years but just a reminder of how and why glyphosate works on foxtail barley.  Further down the article from a source out of Canada you will find information about other products with some suppression or control.

Control with Glyphosate

Herbicides containing the active ingredient glyphosate applied at 0.5 litres/acre (formulations

with 360 grams of active ingredient per litre) control spring and fall-germinating seedlings (less

than 8 cm in height). This rate only suppresses mature plants. Control of mature plants requires

glyphosate rates of 1 to 2 litres/acre. Late summer or fall applications encourage glyphosate

movement into the root system. Control with glyphosate is improved by good growing conditions.

Pre-seeding or Summerfallow

A pre-seeding glyphosate application at 0.5 litres/acre controls young foxtail barley plants

(less than 8 cm in height) and provides some suppression of mature plants, with 1 to 2 litres/acre controlling a range of foxtail barley plant sizes. The higher rate is needed to kill mature plants or plants that are stressed.

Post-harvest

Post-harvest glyphosate gives the best root-kill of established foxtail barley if soil moisture

conditions allow the plants to remain actively growing. Optimum uptake and movement of

glyphosate into foxtail barley roots occur at temperatures above 10°C.  In-crop Control for Oilseeds and Pulses Research by Agriculture and Agri-Food Canada at Lethbridge has shown that several herbicides registered for grassy weed control in oilseed or pulse crops, while not registered for foxtail barley control, can provide control or suppression of foxtail barley seedlings (Assure gave the best results while Poast, Select, Fusion and Venture provided some suppression.  Consult the North Dakota Weed Control Guide for details and recommendations.

There is evidence that Assure 11 gives pretty decent results in labeled crops.  In summary;

Foxtail barley is a tough-to-control perennial weed in zero tillage systems. Herbicides containing

glyphosate can effectively control seedlings at relatively low rates with much higher rates

required for control of mature plants. Cultural practices that encourage a competitive crop, such

as high seeding rates and banding of nitrogen fertilizer, help to reduce yield losses and slow the

spread of foxtail barley.

Prepared by Rob Dunn , Alberta Agriculture and

Food and Dr. Bob Blackshaw, Agriculture and

Agri-Food Canada.

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