Weed Science Update - June 16 (Prostko)

Just got done rating some of my soybean weed control plots.  Thought I would pass along these few thoughts.

1) Not sure what to say when someone asks me "When are you guys going to figure out how to control pigweed?"  I am pretty confident that we have but not everyone listens or can get it done! (Figure 1).

  

Figure 1.  General overview of 2017 soybean weed control plots in Ty Ty, GA.   Notice weedy-checks in comparison to other plots (started clean + activated residual + timely POST).

2) I fear that some are thinking that the new auxin technologies are the greatest thing since sliced bread.  That would be very stale sliced bread since 2,4-D has been around since the 1940's and dicamba since the 1960's.  I am still getting great results with other chemistries (Figure 2).

Figure 2.  Soybean weed control in 2017 with Tricor (metribuzin) followed by Roundup PowerMax (glyphosate)+ Reflex (fomesafen).

3) If growers decide that they must use the auxin weed control systems, I cannot over emphasize the need for residual herbicides in these programs (Figure 3).

Figure 3.  Weed regrowth/emergence (1 sq. ft.) 25 days after a single application of Roundup PowerMax (28 oz/A) + Xtendimax with VaporGrip (22 oz/A).