Skip to main content

Why are the leaves on my plants turning yellow?

Tomato diseases are plentiful and complex. There is no substitution for contacting a local extension agent for help in a final diagnosis. There are many websites, such as the Cornell site, that provide a wealth of information.

Yellow leaves can indicate a number of conditions. Lower foliage with yellow blemishes is likely indicative of a fungal issue such as early blight. If an entire tomato stem or plant turns bright yellow and wilts, a more serious issue is underway, such as fusarium wilt. Fusarium attacks plants through the roots and resides in the soil for years. A general “yellowing” of foliage (pale rather than deep green) could indicate the need for added nutrition or the available nutrients being out of balance.

Sign up for our Newsletter

We respect your privacy. Your information will not be shared.