Nematodes

Orders Common in soil

1. Rhabditida (buccal cavities)
2. Dorylaimida (odontostylets)
3. Tylenchida (stomatostylets)

Nematodes

Stomatostylet

Meloidogyne spp.

• Root knot nematode/endoparasites

Nematodes

Stomatostylet

Meloidogyne spp.

1. Galls due to growth regulators/ "giant" cells
2. Wide host range
3. Prefers high temps
4. Mature Females are pear-shaped
5. Lays eggs externally
6. Abet fungal, bacterial infections

Nematodes

Stomatostylet

Heterodera spp.

Nematodes

Stomatostylets

Heterodera spp.

1. Endoparasite
2. Create large cells ("syncytia") akin to giant cells
3. Relatively narrow host range
4. Mature females lemon-shaped
5. lays eggs within bodies
6. Readily recognized on roots (pearl-like females)

Nematodes

Stomatostylet

Pratylenchus

Lesion Nematode

Nematodes

Stomatostylet

Pratylenchus

1. Endoparasites
2. Causes root lesions
3. Wide host ranges
4. All forms vermiform
5. Abet fungal/bacterial infections

Nematodes

Stomatostylets

Aphenlenchoides

Foliar nematode

Nematodes

Stomatostylets

Aphenlenchoides

1. Endoparasites
2. Causes langular lesions on leaves

Nematodes

Odontostylets

Trichodorus

Stubby root nematode

Nematodes

Odontostylets

Trichodorus

1. Ectoparasites
2. Wide host ranges
3. Transmits certain viruses, including (corky ringspot)
4. All forms vermiform
5. Impedes root tip development