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Monica from PA
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.
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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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
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.
I have a tomato plant with leaves that are turning yellow with black spots. I transplanted it two weeks ago into a plastic container.
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.
This is a disease. You need a fungicide.