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We are approaching that time in the desert lettuce production season when downy
mildew can become a concern. Development of downy mildew on lettuce is strongly
regulated by the presence and duration of free moisture on plant leaves. This moisture
can be supplied by rainfall, dew, and sprinkler irrigation. Optimal management of
downy mildew is achieved by having a fungicide in place before disease symptoms
become apparent. Less than optimal but good levels of downy mildew control can also
To contact Mike Matheron go to: matheron@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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