Blight
Blight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are:
Tomato bushy stunt virus
TBSV has a broad host range under experimental conditions and has been reported to infect over 120 plant species spanning 20 families. However, under natural conditions its range is much narrower and generally comprises crop vegetables and ornamental plants. It was first identified in tomato plants and also has been documented to affect apple, artichoke, cherry, grapevine, hops, and pepper. Although it causes significant loss of yield in tomato plants, it is not considered an economically significant pathogen. It is, however, a very well-established model system for the study of plant viruses, usually through experimental infection of "Nicotiana benthamiana" or "Nicotiana clevelandii", relatives of tobacco plants in which TBSV can cause systemic infection. Notably, the common model plant "Arabidopsis thaliana" is not a host. TBSV can also replicate in yeast in laboratory conditions.