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Weed control, management, ecology, and minutia
Comments:
by Frank Peters
on November 6, 2017 at 7:37 AM
Do you know the ppm of 24-D and Dicamba in the compost?
by Brad Hanson
on November 6, 2017 at 8:12 AM
Hi Frank,  
I think this issue was not confirmed as either 2,4-D or dicamba - to answer your ppm question, they'd have needed laboratory analyses done. Instead, the symptoms were "consistent with those caused by growth regulator herbicides". The bioassay with activated charcoal helped narrow the problem down to a soil-related issue (vs drift, for example).  
Here is a link to a useful herbicide symptomology database at UCIPM http://herbicidesymptoms.ipm.ucanr.edu/  
-Brad
 
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