A couple of thoughts on residual herbicides

I apologize, but during the our preparations for the Respection the Rotation field day, I was unable to get a blog post out to publicize the event. The event featured several trials we established on the Jake Fisher farm in Hayward, MO primarily examining herbicide strategies utilizing Liberty Link crops under heavy pigweed pressure. Among the speakers were: Jason Weirich, Ford Baldwin, Ken Smith, Larry Steckel, Grover Shannon, Allen Wrather, Kelly Tindall, and others.

The use of a residual herbicide was stressed by several speakers as a necessary component of a pigweed-oriented herbicide program. Based on my experiences working with Dr. Jason Weirich’s program I must agree, but since these products must be rain (or sprinkler irrigation) activated I was curious as to how many days existed for succesful application of these products, so I went to the Lee Farm weather archive and checked.

My criteria for a succesful spray date were: 1) wind speed less than 10 MPH, 2) you had to physically be able t0 run equipment within the field (two days without rain prior to spray date), and 3) the applied material needed to be activated by at least 0.5″ of rain within seven days of application. Your 2011 succesful spray dates at the Lee Farm were: 18 April, 11 & 12 May, and 4 – 10 June.

Wheat beans had a pretty good window and this shows as one drives through the Bootheel, but May planted crops had a very small window to get these products applied under perfect conditions. So, what does this mean? The real take home here is that when those perfect days show up, you want to have your equipment ready to go and keep it running to maximize the amount of acres you can protect and you better have a pretty good plan ‘B’ for when you aren’t lucky and your residual herbicides don’t work as planned.

Categories: Weeds

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