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:
Xanthomonas arboricola
"Xanthomonas arboricola" has an extraordinarily destructive potential when infecting crops. It is the most devastating blight on walnut, and can cause up to 100% yield loss if not properly managed . Its host range threatens stone fruits and other nuts. Epidemics have been reported in countries such as The United States, Iran, Turkey, and Italy. These outbreaks are not limited to just these countries, and without extensive epidemiological knowledge, it could spread with devastating effects. Through disease forecasting efforts, "X. arboricola" is known to have its highest virulence and growth rate at around 30 degrees Celsius. Temperature in addition to understanding regional humidity, could help prevent future epidemics in agriculture. Less moisture on the plants, and slightly cooler temperatures can hinder both the dispersal and growth of "X. arboricola". In Australia an estimated 3.1 million AUD were lost on average due to yield loses from "prunus" "spp." in years with pathogen prevalence. The pathogen’s capability to survive in woody tissue over winter, or after plant death proves a major challenge for plant pathologists to find an effective solution.