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The application pattern and timing of application for the preemergence herbicides
used on lettuce are all distinctly different. This is primarily the result of how
strongly they adhere to our soils and how safe they are to the crop.
Balan (Benefin) adheres strongly to our finer textured soils and can cause significant crop injury if concentrated near germinating lettuce seed. Label recommendations are to broadcast and incorporate this herbicide prior to listing beds. It is often applied and incorporated to listed beds, however, with acceptable crop safety. It must be mechanically incorporated and crop injury is more likely when using it like this. It is more active on grasses than it is on broadleaf weeds. It is used on fewer acres of lettuce than the other two preemergence lettuce herbicides and is commonly used in combination with one of them. Prefar (Bensulide), also adheres strongly to fine textured soils but it can Kerb (Pronamide), differs from the other two because it does not adhere as strongly to the soil. Our trials have demonstrated that if more than 0.75 to 1.0 inch of overhead water is applied, it begins to leach below the shallow weed seeds. To overcome this, delayed and split applications are often made. It also differs from Prefar and Balan by being more systemic in some plants. The other two have only very minimal movement in plants. Kerb can control some seedling weeds that have already emerged. Kerb will also control a broader spectrum of both broadleaf and grass weeds than the other two.
To contact Barry Tickes go 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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