Thus, it is easy to separate from the European borer. The southwestern corn borer tends to attack the lower half of the corn plants. When corn is very young, the borer may kill the center of the plant, causing dead-heart. Treat when 50 percent of plants have feeding damage. Apply sprays in at least 15 to 20 gallons total volume per acre.
Sprays applied by group are usually more effective that aerially.
Granules should be applied directly into whorls. Furadan applied in-furrow at planting will aid in control of first generation European corn borers. Eggs are laid in masses, each with up to four eggs, with the individual eggs overlapping like shingles, similar to the European borer. Each egg is marked with three pink lines. Eggs are laid on both the upper and lower leaf surface.