This fungal disease firsts manifests on a plant's lower leaves as very small brown on black circles with lighter-colored centers. Eventually, the number of spots increases and the leaves turn yellow. As the disease moves up the plant, it damages its ability to photosynthesize, flower, and set fruit.
You have to be ruthless to root out tomato blight. First, remove any damaged leaves you see; if too much of a plant has been damaged, uproot it entirely and dispose of it. DO NOT put the diseased plant material in your compost heap or bin; it needs to be either buried far away from your garden, or burned. Wash your hands with soap between inspecting each plant so you won't infect healthy ones.
As far as getting rid of tomato blight goes, you'll either have to wait it out or turn to container gardening, because the organisms responsible can survive in the soil for 3-5 years. That's why you should never replant new tomato seedlings in an area recently struck by blight. To be safe, you'll need to move your tomato patch somewhere else for several years.
If you're growing tomatoes in containers, dispose of the infected potting media (again, NOT in your compost) and scrub the containers vigorously, inside and out, with warm, soapy water followed by a bleach solution. Be sure to rinse the bleach residue off the pots before replanting in them.
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