Category: Fungal Disease

Fusarium wilt of lettuce continues to be confirmed in numerous coastal California plantings, and previously un-infested ranches are found to harbor the pathogen. Symptoms are most often seen on diseased iceberg (“head”) lettuce, though romaine and other types can also be infected and show symptoms. In fact, some romaine plantings in Yuma (last winter) and […]

A new race, race 9, of the lettuce downy mildew pathogen (Bremia lactucae) has been confirmed and named in 2018. Here are some miscellaneous notes regarding the identification and naming of new races of this lettuce pathogen. Bremia lactucae is a genetically diverse pathogen and is made up of distinct, separate sub-groups or sub-populations called […]