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Cold, wet weather optimal for herbicide injury in rice
Author: Bob Scott, Professor & Extension Weed Scientist

With more wet weather and an unprecedented cold front coming through, conditions are right to see some injury from rice herbicides. One particular “no-no” is Newpath on hybrid Clearfield when conditions are like this. I would,  in fact,  avoid the use of ALS chemistry in general on rice until it warms up a bit. Usually, when temperatures are in the upper 70’s for at least 4-5 days in a row and warming up, I don’t see as much injury.

 This being said, once it does warm up, it will be time to get started with POST applications in those fields where rice is up and get PRE’s out even in fields where rice was planted prior to the rain and cold but have not come up yet.

 There have not been many major label changes for rice this year. However, the new Premix Obey from FMC (Command and Facet) has gotten some interest.  If you have or think you have a problem with propanil and especially propanil + Facet resistant barnyardgrass, then the best timing for Obey in the first application to go on the field whether that is early POST or a PRE.  However, using the FMC program of Command followed by Obey will allow you to get two full rates of Command out per season for grass and push the Facet component of Obey back to help on broadleaves.

It is another “not normal” year. Somebody let me know when we do have a “normal” year.  After 11 seasons, I am not sure I have experienced one yet, maybe one of those back in the mid-2000s, I forget.

Rice is the most resilient crop that I work with and can handle the cold, just let it grow before we start throwing a bunch of chemicals at it also.


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