Soybean thrips

Thrips make tiny, linear, pale-colored scars on soybean leaves where they penetrate individual leaf cells and feed on the contents. They usually feed on the undersides of leaves, much of which occurs along the veins. When leaves are heavily infested, the feeding scars may be so numerous that a mottling look appears along and between the leaf veins and leaves may become crinkled in appearance.
Soybean is particularly susceptible to thrips damage early in the growing season. Dry, hot weather increases the threat of damage.