<human>:  How do I prevent my tomato plants from being affected by blight?
<bot>: To prevent tomato plants from being affected by blight, it is important to make sure that they are kept in a location with adequate air circulation and not overcrowded. Ensure that the plants get enough water and check the leaves regularly for signs of any disease. If you discover any signs of blight, immediately remove the affected plant to stop the spread of the disease. Fungicidal sprays can also be used to prevent or control blights.