Bui. 842, U. S. Dept. of Agriculture. 
Plate I 
Leaves of Wheat Plants Affected by Tylenchus tritici. 
A, Month-old seedling from the greenhouse, inoculated by placing a few drops of water 
containing larvae on the seed when planted. Note the abnormal wrinkling of the central 
leaf. B, Leaf from an infected greenhouse seedling, showing the characteristic wrinkling, 
rolling, and twisting caused by the nematodes. C, Part of an almost mature field- grown 
plant, the head of which contained many nematode galls. The upper leaf often is found 
tightly rolled on such plants. 
