Blight

Blight originates from moist or foggy weather and from hoar-frost, the effects of which, when expelled by a hot sun, are first discernible on the straw, and afterwards on the ear, in a greater or less degree, according to local circumstances. Let a field be examined in a day or two after such weather, and a careful observer will soon be satisfied that the fibres and leaves of plants are contracted and enfeebled, in consequence of what may be called a stoppage of perspiration. This disorder may take place either earlier or later, but is most fatal when it appears at the time the grain is forming in the ear. It may appear at an earlier stage; and though the productive powers of the plant will thereby be lessened, yet, if circumstances are afterwards favorable, the quality of the grain produced may not be much impaired; or it may appear after the grain is fully formed, and then very little damage will be sustained, except by the straw.

See also wheat