Small plant-parasitic nematodes, 0.3mm long.
Females: Gravid female may
swell anterior to vulva.
Strong stylet, usually about 36 Âµm.
Often their starved bodies are marked by
characteristic banding patterns as food reserves are depleted.
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
East coast and midwestern U.S., Canada, Europe, New Zealand, and the
J2 and J3 feed; J4 has an incomplete stylet and molts to adult form
after host stimulation. Nematodes insert stylet at or near base of root
hairs and feed at one site for up to 6 days.
Cereals, grasses, ornamentals, celery, red clover, and cabbage.
Males and fourth-stage juveniles have no stylet and do not feed.
J4 is the persistent stage - molt of the J4 is stimulated
host root diffusate, for example, carnation root diffusate. The
J4 do not molt to adults in water, but molt progressively over a 2 week period
in carnation root diffusates (Rhoades and Linford, 1959).
In older pot cultures or field soils, the resistant J4 may be 80% of the
J4 distinguished from other stages by reduced or absent stylet and esophagus
and accumulation of opaque granules in esophagus region (Rhoades and Linford,
Control is difficult by crop
rotation due to wide host range, or by fallow
soil (J4 survives
are not economical.
Host Plant Resistance, Non-hosts
Rhoades, H.L. and M.B. Linford. 1959. Molting of preadult nematodes of the
genus Paratylenchus stimulated by root diffusates. Science 130: