Blast, in agriculture and gardening, is a term synonimous with. blight, which see.

That species of blasts called ure-dines, or fire-blasts, is supposed by Mr. Hales to originate from the solar rays, reflected from, or condensed in the clouds, or collected by the steams in hop-gardens, etc. They wither, scorch, and blacken the leaves, blossoms, and fruits of trees, shrubs-, grass, corn, etc. and this devastation is at times extended over whole tracts of ground.