To reduce damage next year, dispose of infested fruit before insects have a chance to complete the life cycle. Diazinon at planting time will control seedcorn maggots.later plantings will be less infested. Aphids and leafhoppers can be found on green portions of many root crops. Rub or wash off aphid colonies. Control leafhoppers with Sevin or diazinon.
Leafhoppers are green, wedge-shaped, and often walk sideways or hop.
If the populations are high, Sevin or diazinon will control these insects, which are responsible for transmitting Stewart's wilt. Both are found in the developing root but enter it in different ways. If you see carrot tops yellowing or wilting, look for signs of the maggot or grub. The weevil enters from the top and may only scar the root. Harvest the carrot, remove top damage, and use the rest of the root.