Jul. 842, U. S. Dept. of Agriculture. 



PLATE I I . 



Wheat Seedling and Leaf Infected by Nematodes. 



A, A five-weeks'-old wheat seedling from a greenhouse, artificially infected with Tylcnchus tritici 

 and decidedly dwarfed as a result. Observe that the twisted central leaf is held in the next 

 older leaf sheathed by a nematode gall on its edge and that the small upper leaf on the right 

 is distorted, wrinkled, and twisted. Photographed May 31, 1918. Natural size. B, Part of 

 the plant pictured in A , enlarged to show the location, shape, and size of the nematode gall 

 on the central leaf and contiguous portions of the infected leaf. X 2. C, Leaf blade of a wheat 

 seedling, showing the one-sided apical development and small nematode galls as a result of 

 artificial inoculation in the greenhouse. Photographed in October, 1917. X 2. 



