Tomato blight is a common problem that affects tomato plants. It causes the leaves to turn yellow and the fruit to rot. There are many synonyms for tomato blight, including late blight, potato blight, and Phytophthora infestans. Late blight is caused by a fungal pathogen and can lead to a complete loss of the tomato crop. Potato blight is similar to late blight, but it affects potato plants instead of tomatoes. Phytophthora infestans is the scientific name for the fungal pathogen responsible for causing blight. Other common tomato plant diseases include blossom end rot, bacterial spot, and fusarium wilt. Proper care and management can help prevent these diseases from affecting your tomato plants.