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



Plate VI. 







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Larv/e of Tylenchus tritici. 



A, Photomicrograph of an unstained cross section, 15 n in thickness, of a nematode flower 

 gall, showing larvae in the center unattached to the inclosing host walls. X 37. B, 

 Photomicrograph of active larvae from a flower gall moving in a drop of water. Note 

 their transparent anterior ends and their tapering, slightly pointed posterior ends.. 

 X30. 



