Arizona Crop Information Site logo
University of Arizona
Vegetable IPM Updates Archive
 
Cooperative Extension
 
 
 
 
Postemergence Weed Control in Lettuce (November 11, 2015)
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 video
                        link
To contact Barry Tickes go to: btickes@ag.arizona.edu.
Back

For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
College of Agriculture, The University of Arizona, Tucson, AZ.


Home | Cotton | Veggies | Forages | Grains | Citrus | Crop x Crop
Insects | Diseases| Weeds | Pesticides | Economics | News | Weather | Research | Photos | Contacts | General Info.






Copyright © 2001 University of Arizona,
College of Agriculture and Life Sciences
Webmaster: Al Fournier (acis@ag.arizona.edu)