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Weed control, management, ecology, and minutia
Comments:
by Brad Hanson
on December 5, 2017 at 11:15 AM
Looks like it also has root pruning that would be consistent with a dinitoranaline herbicide. Ethalfluralin (Sonalan), is registered in melon and is one possibility.  
Good photos.  
Brad
by Brad Hanson
on December 5, 2017 at 11:18 AM
Correction, ethalfluralin is called Curbit in the melon market. The Sonalan product with that active ingredient is registered in several agronomic crops (dry bean, sunflower etc)
by Gary Gliddon
on December 7, 2017 at 9:19 AM
Is this Johnson grass resistant to Poast? I have heard of J grass resistance to glyphosate and hope I don't see any of it. But if it gets resistance to both poast and glyphosate this will be a tough weed to get rid of.
Reply by Brad Hanson
on December 8, 2017 at 11:44 AM
Hi Gary,  
We've not confirmed resistance to Poast (sethoxydim) in California but this population has not been tested either.  
 
I took a quick look at The International Survey of Herbicide Resistant Weeds (www.weedscience.com)and see there are about 8 reports of Johnsongrass resistant to the Group 1 (ACCase inhibitor) herbicides. Five of those are from the US southern and south-eastern cotton and soybean production systems.  
 
As you pointed out, there are also populations reported with resistance to glyphosate. So far, no confirmations of that biotype in CA. But, clearly it is possible and something to be aware of as weed managers!
 
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