NEMATODE GALLWOEM ON POTATOES, ETC., IN NEVADA. 



or transi:)lanted into iininfested land from any land that may possibly 

 be infested: 



Beets, carrots, celery, cucumbers, e<?gplant, lettuce, muskmelon, pumpkin?, pota- 

 toes, salsify, squash, tomato, watermelon, (;lover, cowpeas, rape, soy beans, catalpa, 

 cherry, elm, peach. 



The followinji; are subject to attaek by nematodes and, although 

 these plants are not themselves hable to serious injury, they should 

 not be planted on infested soil for fear of keeping the gallworm alive: 



Alfalfa, vetc-h, sweet clover, asparagus, cabbage, 

 cauliflower, garden peavS, horseradish, strawberries, 

 kale, Lima beans, onions, radish, spinach, sweet 

 potatoes. 



A 



Fig. 6.— Roots of peach, showing en- 

 largements caused by the gallworm. 

 Dr. Neal, investigating this disease 

 in 18&8, expressed the opinion that 

 large niunbers of peach trees in the 

 southern United States had been 

 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 to them. (After 

 J. C. Neal.) 



Fig. 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.) 



Fig. 8.— Roots of weeping 

 willow, showingenlarge- 

 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 w^eeds and other plants 

 wliich 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 

 tliis nematode, the accompanying text figures are presented to show 

 some of the malformations on the roots of different plants resulting 

 from nematode attacks. 



[Cir. 9i] 



