Carrot weevil

Caused by: Listronotus oregonensis
Problem Category: Insect
Symptoms: Irregular dark grooves in zig-zag pattern on roots; leaves of plant may yellow; adult insect is a dark colored beetle; larvae are white to pinkish white C-shaped grubs with a yellow-brown head
Comments: Adult weevils overwinter in crop debris remaining in the ground; larvae feed for approximately 2 weeks before pupating in the soil; insect undergoes several generations each year
Management: Remove all debris from Umbelliferous crops (e.g. parsley, dill, celerey etc.) to reduce sites where weevil can survive and persist; try to rotate Umbelliferous crops to different areas of the home garden each year to reduce survival of larvae in soil
Control: spray 5% neem seed kernal extract or 5ml Neem oil to control the Weevil damage