For control of wireworms on sweet corn, apply 7-15 ounces per 500 square feet in a broadcast application. Mix into soil to a depth of 4-8 inches. Four percent diazinon dust should be applied evenly as a broadcast treatment. Immediately after the dust is spread, it should be mixed thoroughly into the soil to a depth of 6-8 inches. Apply broadcast and work into the soil immediately just prior to planting.
Wireworms are the larvae of the click beetle.
They attack the stems and root systems of plants, sometimes tunneling their way through the stem to above ground level. Most of its destruction however takes place below the soil level. The tubers of potato plants and turnips are greatly affected, where wireworms will riddle the tubers with their tunnels. Since the wireworm takes three to four years to mature into a click beetle you may have to deal with the problem for quite a while. The organic approach is to be sure to till the ground very deep, as to destroy as many worms and beetles as possible.