Bui. 842, U. S. Dept. of Agriculture. 
Plate V. 
Larv/e of Tylenchus tritici. 
A, Photomicrograph of the root of a wheat seedling growing in a tube of plant-nutrient agar 
and showing active eellike larvae accumulating about the root tip. The writer was unable 
to produce infection through the root, however, x 45. B, Masses of milk-white thread- 
like larvae photographed while actively moving about in a few drops of water after having 
escaped from the portion of a cut-open flower gall shown near the center of the photograph. 
