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The registration of Pronamide (Kerb) for use on leaf lettuce was cancelled almost
7 years ago. It had been the standard for weed control on all types of lettuce for
45 years and this cancellation created serious economic problems for leaf lettuce
producers. As the end users, we do not see all that goes on when a pesticide is
registered for food crops, especially now with all of the concern for food safety
and environmental contamination. EPA required all of the data needed to register
a new product which is now very stringent. Among other things, the cancer classification
had to be changed from “Likely to be Carcinogenic to Humans” to “ Not Likely…” Once
this was accomplished it opened up the risk cup to add leaf lettuce. A tolerance
had to be established based on residue trials conducted by Dow AgroSciences and
the IR- 4 Program. A tolerance of 1 ppm was established which is the same as head
lettuce. Drinking water, surface water and ground water risk assessments also had
to be conducted. Various other more minor requirements also had to be addressed
but both US EPA and the State of Arizona have now approved the registration. No
less critical in all of this has been industry support including numerous letters,
meetings and phone calls from many in the industry. A group of representatives from
the Arizona lettuce industry submitted a Sec 18, Emergency Exemption application
that contributed to this effort. This group consisted of Steve Alameda (grower ),
Bill Fox (PCA), Kevin Ford ( vegetable seed), Matt Mcguire (grower), Bruce Gwynn
(Yuma Fresh Vegetable Association.) and Shelley Tunis ( Yuma Fresh Vegetable Assn.).
There are few people involved with the lettuce industry in Arizona and California
that were not involved with DowAgrosciences in some way to restore this valuable
registration. The system was slow and expensive but it worked.
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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