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Black Spots on Tomato Plant Leaves

Category Plant Health
Several plant diseases can cause spots on your tomato plant's leaves. Determining the cause can help you begin treatment. This is a guide about black spots on tomato plant leaves.
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June 24, 20100 found this helpful

Question:

I have Roma and Grape tomato plants that have loads of fruit on them, the vines are another story! They were all in good shape until a month ago, when leaves started turning yellow with black spots. I sprayed some insecticidal soap on them a few times, and cut off the bad foliage, but they continued to deteriorate. Again my tomatoes are great, but the vines are nearly bare because the leaves turn yellow and dry up and fall off. What causes this and what can I do in the future to prevent it? Thanks for your help.
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Monica from PA

Answer:

Monica,

From your description, it sounds like your plants could be affected by one of three common tomato blights. Septoria leaf spot (or blight) and Early Blight are the two most common, both of which tend to start after the fruit sets. The third is Late Blight, which usually only occurs after unusually cool, wet weather. These are all airborne fungal diseases that require dew or rain to infect the plants. These diseases build up rapidly in wet weather and cause dark leaf spots followed by yellowing and defoliation (leaf drop). They may also produce spots on the fruit.

You did the right thing by cutting off the affected foliage, however these blights are difficult to control once established. This fall, pull up and destroy any remaining vines. Because this fungus can over winter in the soil, rotate your tomato plantings every year (plant in the same place only once every 4 years). Mulch the base of the plants with 1-2 inches of straw, newspaper or other organic materials and water the plants from the bottom. Consider spacing the plants farther apart to increase air circulation and use a fungicide as needed.

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By 1 found this helpful
June 24, 2010

I have a tomato planted in a pot and now it has black spots all over it. What can I do? Is it a bug?

Hardiness Zone: 9a

By Carole from Klamath, CA

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June 27, 20100 found this helpful
Best Answer

My nanna says that to get rid of Black Spot on roses; mix 1 cup water, 1 tablespoon bi-carb soad/baking soda and spray on the leaves and around the plant. Not sure if this is the same sort of black spot, but I highly doubt it would damage your plant if you tried anyway.

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By 0 found this helpful
June 15, 2016

I have a tomato plant with leaves that are turning yellow with black spots. I transplanted it two weeks ago into a plastic container. I don't have any green space to plant it in ground. What is the problem and what do I do?

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February 28, 20170 found this helpful

This looks like a disease. ANy number of plant antifungals should help. As well, water the tomatoes a lot but during the early day so that the moisture at night does not contribute to the problem. Tomato food, crushed eggshells and enough water and sun should create a healthy plant that does not have so many problems.

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February 28, 20170 found this helpful

This is a disease. You need a fungicide.

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