Symptoms of Fusarium yellows on celery caused by Fusarium oxysporum f. sp. apii. Infected plants turn yellow and are stunted.

A very long plot of celery of six rows. In the foreground there is a pronounced divide across the rows with vibrant green young celery tops on one side and yellow, stunted celery on the other. Small flags planted along the divide suggest that this is a field under study.  Credit: Christopher Greer, Area IPM Advisor, UCCE San Luis Obispo County
Credit: Christopher Greer, Area IPM Advisor, UCCE San Luis Obispo County