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Once broadleaf weeds become established in lettuce, there are no herbicides that
can be used to selectively control them. Kerb( Pronamide) will control some emerged
weeds when they are very small but if they get more than about 0.25“ in diameter
they will recover. Grasses can be controlled selectively postemergence with Poast(
Sethoydim) or Select Max(Clethodim) although only Clethodim worls on annual bluegrass
and sprangletop and neither works on sandbur. Several herbicides have been tested
to control emerged broadleaf weeds in lettuce but nothing has been both safe to
the crop and effective on the weeds. Some work was done in recent years with low
rates of Pursuit( Imazethypyr) on lettuce. It looked like it might be ok on head
lettuce only but has a long soil residual and would likely cause problems with subsequent
crops planted in the same field. Cultivation and hand weeding are the only options
for established broadleaf weeds in lettuce.
Click picture to listen to Barry'update
To contact Barry Tickes go to: btickes@ag.arizona.edu.
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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