Distribution of Three Races in Coastal California and Evaluation of Resistance in Lettuce.

Verticillium wilt, caused by , is one of the most devastating soilborne diseases of lettuce ( L.). There are three races of , and each race has been characterized by markers representing race-specific effectors.

First report of (syn. ) causing Pythium wilt of lettuce in Arizona.

In 2021 and 2022, wilt symptoms were observed in lettuce ( L.) fields in Yuma County, Arizona (AZ). Incidence was < 1% at all locations.