Damage appears either as a wilting young plant or a dead whorl.
This problem is common in weedy areas, especially where grass is present and with minimum-tillage operations. Larvae of the common stalk borer are easily identified due to the obvious purplish stripes. Prevention of stalk borer damage is best accomplished by maintaining weed-free fields. Must be applied when or shortly before the stalk borer larvae are moving into the corn from surrounding weeds and grasses. More than one application may be necessary.