Nematodes - Westcott's Plant Disease - page 245

main roots, resulting in excessive branch roots;
plants are stunted and may die. Injury is more
serious in sandy soils. Yields have been increased
by using granular Nemagon, mixed with fertil-
izer, as a side-dressing or by planting in fumi-
gated beds. Rotation with corn and some grains
may be practical.
Meloidogyne incognita Root-Knot Nematode .
On kiwi, sequoia, society garlic, sweet potato,
and jacquemontia.
Meloidogyne incognita Cotton Root-Knot
Nematode . A southern native associated with
many plants - forage crops, bean, cabbage, can-
taloupe, carrot, celery, chard, corn, cucumber,
grape, lettuce, pepper, potato, radish, rhubarb,
soybean, New Zealand spinach, squash, tobacco,
tomato, turnip, watermelon; also on azalea, box-
wood, camellia, calthea, coleus, collinsia, day-
lily, gardenia, hibiscus, hollyhock, iris, India
love grass, nephthytis, roystonea, schefflera, and
scindapsus. It was reported on iris in 1955, from
New York and Texas, the first instance of rhizo-
matous iris credited as host to a root-knot nema-
tode. Tips of leaves turn yellow, then brown, with
whole leaf gradually dying. There are some resis-
tant soybean varieties, and asparagus, strawberry,
and peanut can be used in a rotation.
Meloidogyne incognita Southern Root-Knot
Nematode . Native to the South and common
there, but overwintering as far north as New
Jersey. This is the most important root-knot spe-
cies on peach; it is also recorded on abelia,
banana, bean, carrot, coleus, corn, cucumber,
daylily, eggplant, gardenia, geranium, hibiscus,
onion, okra, sweet potato, pepper, tomato, water-
melon, and willow. It causes stunting and chloro-
sis of gardenia, but does not occur on peanuts or
strawberries, and these may be used in a rotation.
Resistant crotalaria and oats can be used as cover
crops in peach orchards, and some peach
understocks are highly resistant.
Meloidogyne javanica Javanese Root-Knot
Nematode . Common in southern peach orchards
and nurseries, widespread in Georgia on peaches
such as Yunnan and Shali that are otherwise
resistant to root knot. Found in northern green-
houses. May be associated with azalea, bean,
beet, cabbage, calendula, carrot, carnation, corn,

Cocos plumosa , cucurbits, eggplant, impatiens,
radish, sequoia, snapdragon, soybean, tomato,
and watermelon. Resistant peanut, strawberry,
cotton, and pepper can be used in the rotation.
Meloidogyne ovalis On maple.

Naccobus

Pratylenchidae. Males wormlike; females swol-
len in the middle, saclike, with a short, narrow
tail; eggs extruded in a gelatinous matrix or held
within the body; stylet with small basal knobs;
endoparasites.
Naccobus aberrans False Root-Knot Nema-
tode . Important in western sugar-beet fields,
also present on garden beets, cacti, carrot, cruci-
fers, gaillardia, lettuce, and salsify. Root galls are
similar to those caused by Meloidogyne , and may
be fairly large.
Naccobus batatiformis On cabbage, cactus,
carrot, and stock
Naccobus dorsalis Reported on heronsbill

(erodium), probably on other hosts.

Nacobbodera

Heteroderidae
Nacobbodera chitwoodi Reported on Douglas
fir, and spruce.

Nothanguina

Anguinidae
Nothanguina (orrina) phyllobia Foliar Nema-
tode . On nightshade.

Paratylenchus

Tylenchulidae. Pin nematodes, related to ring
nematodes but thinner, primarily ectoparasites;
minute; cuticle finely annulated; female with
long stylet, body ventrally curved but too short
for a spiral.