Carrot root fly
Roots of parsnips and related plants such as carrots, celery and parsley are tunnelled by slender, creamy yellow maggots. Leaves turn reddish and wilt in sunny weather, later turning to yellow. Rusty brown scars ring the tap roots of parsnip and other susceptible vegetables, making them inedible and susceptible to secondary rots. When the roots are cut through, their tunnels are revealed often being inhabited by slender creamy-yellow maggots up to 9mm long.
Protect vulnerable crops by forming a barrier of plastic sheeting or fleece to a height of no lower than 24 inches to prevent the low flying female flies from laying her eggs close to the parsnips.
There is currently no chemical control available for the control of carrot root fly.