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:
Begomovirus
Several begomoviruses cause severe diseases all over the world. Those begomovirus species infecting tomato such as "Tomato yellow leaf curl virus" (TYLCV) and "Tomato yellow mosaic virus" (ToYMV), first identified in the late 1980s, cause significant economic losses worldwide. In countries where these viruses have become widespread such as Trinidad, the Dominican Republic, Mexico and much of Central America, Israel, as well as across Southeast Asia including Thailand, Cambodia, Indonesia, and India, these diseases in tomato and other crops including pepper, and eggplant, can cause an estimated yield loss of 50–60%. Begomoviruses infecting pepper ("Capsicum spp.") such as "Pepper leaf curl virus" and "Chilli leaf curl virus" also cause significant losses worldwide. Disease is typically manifested in the infected plant as chlorosis, leaf distortion, flower bud absicion and crinkling and stunting. In countries where these viruses have become widespread across Southeast Asia including Thailand, Cambodia, Indonesia, Sri Lanka, and India, these diseases in pepper and other crops including tomato, cucumber, pumpkin, melon, and eggplant, can cause an estimated yield loss of 40–70%. "Bean golden yellow mosaic virus" (BGYMV) causes a serious disease in bean species within Central America, the Caribbean and southern Florida.Notes on Genus: Begomovirus