NDSU Extension - Ramsey County

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May 20, 2013 Agriculture Column

Howdy!!!  What can I say, tooooooooo wet, would be an understatement.  Rainfall amounts have been mostly in the 2 plus inch range, I heard, second hand, that 1.7 in the northeastern part of the county.  Field work had just started with many more waiting for an extra day to help dry out the wet soil.  This weather will likely find many producers switching to another choice rather than corn and the way the markets opened this morning there may be some other choices available.  Rotation becomes a major concern for many as Canola, soybeans, sunflowers and dry beans all have the same types of disease pressure leaving many challenges for everyone.

This type of weather and the beginning of the planting season has concern for many different applications to include a pre-emergent herbicide.  Just getting the crop planted will be one thing but an additional operation will be likely moved back another year.  What will this do for your resistant weed management plan?  This is a topic that you really need to be thinking about as the problem moves forward.  We do now have confirmed kochia just to the west of Ramsey County and many plants showing signs of trouble here.  For those of you that may have had some pre-emerge down good for you but then there still could be some issues.  The following was furnished by Rich Zollinger (NDSU Extension Weed Specialist). 

 

WHERE DID MY PRE HERBICIDE GO?

The condensed planting season may have diminished use of PRE herbicides. The high winds earlier this week may have moved soil particles from the dry soil surface. If PRE herbicides were applied some of the herbicide may have moved with soil particles. Reports from Stutsman County this week reported almost 0 visibility from dust storms. A good rain would keep the soil in place and those with crop residue on the soil surface from practicing zero-tillage may not have the soil movement compared to conventional tillage. It is impossible to predict how much of the PRE herbicide remains on the soil surface. Rain forecast later this week will activate remaining PRE herbicides. The warm temperatures will soon bring the first heavy flush of weeds and soon growers can determine the activity of PRE herbicides. If weeds do emerge through PRE herbicides then apply your POST herbicides to small weeds, especially to glyphosate resistant weeds as research has shown that glyphosate can control weeds that are less than 1 inch tall. Use full rates and the best adjuvant system with the herbicide mixtures.

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