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:
Halo blight
Halo Blight is an important disease to beans, a money crop, which allow the pathogen Pseudomonas syringae to continue its lifespan. Beans are only one cash crop that can be affected by halo blight. Fields that are affected by this bacteria are at risk for the spread of it by way of rain, wind, or organisms but a widespread infection isn’t common with the cultural practices that are now used. In 1963-1967 there were many precautions taken and irrigation practices used but the effect of the environmental conditions caused epidemics in Idaho beans. The disease triangle illustrates this idea by emphasizing the importance of pathogen, host, and environment.