For optimum growth, plant seed in soil warm enough to promote rapid germination, then provide the cultural conditions that make rapid growth possible. This includes adequate water, sunlight, nutrients and weed control. Do not replant the same crop in the same area. Ignore minor damage that doesn't reduce yield. However, if damage threatens the crop, then action is required.
Root maggots can be a problem when adult flies lay eggs at the base of the plant stems.
Treat the infestation with diazinon granules applied to furrow at planting. However, permissible chemical uses are always changing so carefully read the label before using any chemical. The maggot stage of the leafminer may be observed burrowing in leaves, producing blotchy mines. Although conspicuous, the injury usually has little effect on the growing root. Problems often can be managed by picking infested leaves or crushing the eggs and larvae during plant inspections.