NEMATODE GALLWORM ON POTATOES, ETC., IN NEVADA. 9 
or transplanted into uninfested land from any land that may possibly 
be infested: 
Beets, carrots, celery, cucumbers, eggplant, lettuce, muskmelon, pumpkins, pota- 
toes, salsify, squash, tomato, watermelon, clover, cowpeas, rape, soy beans, catalpa, 
cherry, elm, peach. 
The following are subject to attack by nematodes and, although 
these plants are not themselves lable to serious injury, they should 
not be planted on infested soil for fear of keeping the gallworm alive: 
Alfalfa, vetch, sweet clover, asparagus, cabbage, 
cauliflower, garden peas, horseradish, strawberries, 
kale, Lima beans, onions, radish, spinach, sweet 
potatoes. 
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Fig. 6.—Roots of peach, showing en- a a 
largements caused by the gallworm. rs \ . 
Dr. Neal, investigating this disease } Kites 
in 1888, expressed the opinion that ( \ ine 
V4 
large numbers of peach trees in the (s 
southern United States had been bly 
killed by the gallworm. In short, 
agriculturists, seedsmen, nursery- 
men, and general merchants should 
be specially cautioned against rear- 
ing, buying, or selling trees, plants, 
or tubers which show any swelling 
on the roots except such as are well 
known to be natural tothem. (After 
J. C. Neal.) 
Fic. 7.—Roots of grape (Black Ham- 
burg), showing enlargements 
caused by the gallworm. The 
total damage to various crops 
wrought by the gallworm amounts 
annually to an enormous sum of 
money. (After J. C. Neal.) 
Fie. 8.—Roots of weeping 
willow, showing enlarge- 
ments caused by the 
gallworm. The worm 
thrives in the moist 
sandy soils favorable to 
the growth of most wil- 
lows. (After J.C. Neal.) 
The following plants are, so far as known, seldom or never affected 
by the gallworm and may be used on infested land with the expecta- 
tion of greatly reducing the numbers of the worms, particularly if 
the land is at the same time kept free from weeds and other plants 
which may be attacked: 
Barley, oats, wheat, rye, corn, sorghum, milo, kafir, timothy, and redtop. 
In view of the importance of recognizing promptly the presence of 
this nematode, the accompanying text figures are presented to show 
some of the malformations on the roots of different plants resulting 
from nematode attacks. 
[Cir. 91] 
