Mildew: a major threat to lettuce
May 04, 2020
2 minutes
BILL KERR
In general, the most common lettuce disease that growers have to contend with is downy mildew. This appears as a whitish-grey fungus under the leaves, and yellowish blotches on the corresponding areas on the upper surfaces.
The disease starts on the lower, older leaves of the plant, as these are more susceptible. In addition, being
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