NEMATODE DISEASE OF WHEAT. 5 



swered. In this connection it is of interest to note that a careful 

 examination by the writer of a considerable collection of native 

 emmer, or so-called "wild wheat" (Triticum dicoccoides) , from 

 Palestine failed to reveal the disease. 



Within the United States the disease was first found in 1909 at 

 Modesto, Calif., and Old Fields, W. Va. During the same year it was 

 reported from New York and Georgia. As a result of cordial coopera- 

 tion by the Plant Disease Survey of the Bureau of Plant Industry 

 and the Office of Grain Standardization of the United States Depart- 

 ment of Agriculture and by pathologists and other agricultural 

 agents of various States, the writer has recently examined specimens 



Fig. 1. — Outline map of the United States, showing the distribution of the wheat 

 nematode. The dots represent the States where it was found during 1918, while 

 the crosses indicate the localities in which the disease was reported in 1909. 



from Red Bluff, Calif., from two counties each in West Virginia and 

 Maryland, from one county in Georgia, ancj from a large number of 

 widely separated places in Virginia. Distribution of the trouble in 

 this country is graphically shown in figure 1. Whether the malady 

 occurs only on the east and west coasts and not in the great wheat- 

 growing States of the Middle West is not now known. It may be 

 possible that the trouble exists in the Central States to a limited ex- 

 tent and has been merely overlooked or mistaken for stinking smut 

 or other troubles, or it may not occur there as yet. As the disease ap- 

 parently is not endemic in the United States, nor especially wide- 

 spread as yet, every effort should be made not only to prevent its fur- 

 ther importation into and spread within this country, but it should 

 be eradicated as far as possible from localities already infested. 



