The crop can be attacked by larvae of the carrot fly Chamaepsila rosae. This pest feeds on the outer layers of the root, burrowing its way inside later in the season.

Seedlings may be killed while larger roots are spoiled. The damage done provides a point of entry for fungal rots and canker. The fly is attracted by the smell of bruised tissue.

Parsnip is used as a food plant by the larvae of some lepidopteran species, including the parsnip swallowtail Papilio polyxenes , the common swift moth Korscheltellus lupulina , the garden dart moth Euxoa nigricans , and the ghost moth Hepialus humuli.

Parsnip canker is a serious disease of this crop. Black or orange-brown patches occur around the crown and shoulders of the root accompanied by cracking and hardening of the flesh.

It is more likely to occur when seed is sown into cold, wet soil, the pH of the soil is too low, or the roots have already been damaged by carrot fly larvae.

In Europe, Mycocentrospora acerina has been found to cause a black rot that kills the plant early. A white or buff -colored mold grows on the surface.

The pathogen is most common in temperate and subtropical regions that have a cool wet season. Violet root rot caused by the fungus Helicobasidium purpureum sometimes affects the roots, covering them with a purplish mat to which soil particles adhere.

The leaves become distorted and discolored and the mycelium can spread through the soil between plants. Some weeds can harbour this fungus and it is more prevalent in wet, acid conditions.

Infestation by this causes results in yellowing of the leaf and loss of foliage. Moderate temperatures and high humidity favor the development of the disease.

Several viruses are known to infect the plant, including seed-borne strawberry latent ringspot virus , parsnip yellow fleck virus , parsnip leafcurl virus , parsnip mosaic potyvirus , and potyvirus celery mosaic virus.

The latter causes clearing or yellowing of the areas of the leaf immediately beside the veins, the appearance of ochre mosaic spots, and crinkling of the leaves in infected plants.

The shoots and leaves of parsnip must be handled with care, as its sap contains furanocoumarins , phototoxic chemicals that cause blisters on the skin when it is exposed to sunlight, a condition known as phytophotodermatitis.

Symptoms include redness, burning, and blisters; afflicted areas can remain sensitive and discolored for up to two years. The problem is most likely to occur on a sunny day when gathering foliage or pulling up old plants that have gone to seed.

The symptoms have mostly been mild to moderate. The toxic properties of parsnip extracts are resistant to heating, and to periods of storage lasting several months.

Toxic symptoms can also affect livestock and poultry in parts of their bodies where their skin is exposed. The parsnip is native to Eurasia.

However, its popularity as a cultivated plant has led to the plant being spread beyond its native range, and wild populations have become established in other parts of the world.

Scattered population can be found throughout North America. The plant can form dense stands which outcompete native species, and is especially common in abandoned yards, farmland, and along roadsides and other disturbed environments.

The increasing abundance of this plant is a concern particularly due to the plant's toxicity and increasing abundance in populated areas such as parks.

Control is often carried out via chemical means, with glyphosate-containing herbicides considered to be effective. From Wikipedia, the free encyclopedia.

Root vegetable. Not to be confused with cow parsnip or water parsnip. Retrieved Carrots and Related Vegetable Umbelliferae.

CABI Publishing. Pastinaca sativa L. Plant Sci. Kaloo, G; Bergh, B. Genetic Improvement of Vegetable Crops.

Domestication of Plants in the Old World 3rd ed. Oxford: University Press. Towne's Harvest Garden. Montana State University.

Social Research. Random House. Species Plantarum in Latin. Requires iOS Compatible with iPhone, iPad and iPod touch.

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