[2] Pratylenchus alleni, also referred to as the Root Lesion Nematode, was initially found in the U.S. while infesting nine different varieties of soybeans within a single field in El Dorado, Illinois.

[1] Male and female Root Lesion Nematodes have the same stylet length of about 14 μm long with well-developed basal knobs.

Their vulval body diam is slightly shorter than their post-vulval uterine sac with their vulva to anus difference measuring 3 times that of their tail length.

[1] Similar to all nematodes who are parasitic to plants, P. alleni have 6 stages within their life cycle: egg, juvenile 1–4, and adult.

They remain vermiform throughout their life cycle, and can be found within the roots, or within soil after their host dies and can no longer support them.

For example, it has been recorded on Chrysanthemum in India; raspberry in Argentina; vetch and chickpea in Turkey; and soybean, cotton and wheat in Arkansas, USA.

Chemically based nematicides were traditionally the most commonly used, but over time some have been pulled from the market due to environmental restrictions and concerns, as well as the cost of re-registration of a product.

Sanitation and chemical nematicides are some of the most widely used, but the best control method is to prevent their initial infestation and plant non-host crops.