Hirschmanniella oryzae

Hirschmanniella oryzae, the rice root nematode (RRN), is among the major pests of rice and is the most common plant-parasitic nematode found on irrigated rice. Recent modifications in cultivation practices have led to a substantial increase in rice production, which has been accompanied by heightened levels of RRN. The proportional increases in RRN with rice production can be explained by the nematode's impeccable adaptation towards constantly flooded conditions in which irrigated rice is often being grown. The genus Hirschmanniella is found within the family Pratylenchidae and contains around 35 species, the majority of which are migratory endoparasitic nematodes of plant roots.

from Wikipedia