PLATE a 
A —Wrinkling and curling of tlie leaf edges toward the midrib in a neanatode-infected 
wheat plant. This is a typical case of the emerging leaf being held by the curling 
of the older leaf enclosing it. . , 
B—Twisting of the leaves of a wheat plant due to the nematode disease, ^eslig t 
natural clockwise twist of the leaf is often severely aggravated in mfected.plants. 
C —A nronounced case of bending of the culm of a nematode-infected wheat plant, 
Sie Successively emerging leaves being held by the older leaves as shown 
in A. The lower leaves have been removed m order to disclose the crooked stem. 
D and E. —Badly distorted seedlings of Red Rustproof oats found on dissection to be 
infested with vast numbers of nematodes about the growing points. 
F —One of a large number of wheat plants found near Ocean View, Calif., m 1920, ana 
showing symptoms similar to those caused by nematodes but which are due to 
climatic or other environmental conditions. 
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