Ditylenchus dipsaci

Ditylenchus dipsaci is a plant pathogenic nematode that affects a large range of herbaceous species, sometimes causing galls.  It is often recorded on onion and garlic; symptoms of infection include stunted growth, leaves with pale yellowish swellings, discoloration of bulbs, and swollen stems.   Galls are formed on plantain, thistles and daffodils; on plantain, the galls are irregularly-shaped swellings, sometimes purplish; the leaf may also be distorted. 

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Ditylenchus dipsaci is a migratory endoparasite that has a five-stage lifecycle and the ability to enter into a dormancy stage. D. dipsaci enters through stomata or plant wounds and creates galls or malformations in plant growth.