Knowledgebase

Black Spots on Tomatoes #732302

Asked October 27, 2020, 12:15 PM EDT

I had a very productive Roma tomato plant this year and was very excited for my last harvest before the frost! Unfortunately, I’m noticing my tomatoes have little black spots. Can you tell me what this is and what I can do to prevent them next year?

DuPage County Illinois

Expert Response

Your tomatoes may be experiencing a calcium deficiency, or the pH may be incorrect (too low), which causes a deficiency. It could also be a bacteria or canker, but it's hard to tell from your photos.

These two resources may help you with future tomato growth:
https://extension.illinois.edu/blogs/good-growing/2020-05-01-troubles-tomatoes
https://extension.illinois.edu/spotlight/common-tomato-diseases

University of Illinois Cooperative Extension Master Gardener Replied October 31, 2020, 5:16 PM EDT

Loading ...