Swift moth

It is the soil-dwelling caterpillar of the swift moth which cause the trouble to your plants rather than the moth.

Identifying Features
The caterpillar will move backwards when disturbed. Carrot and parsnip roots are hollowed out.

Treatment
None. Burn affected roots and destroy caterpillars.

Prevention
Cultivate thoroughly before planting and hoe regularly to disturb the soil. Eradicate nearby weeds.