UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 611 L 
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„|y Contribution from the Bureau of Plant Industry 
£&&*&fL WM. A. TAYLOR, Chief 
Washington, D. C. PROFESSIONAL PAPER December 10, 1917 
WALNUT BLIGHT IN THE EASTERN UNITED 
STATES. 
By S^P^tdMuBBAN, I I % 1 - 
Assistant Pathologist, Office of Fruit-Disease Investigations. 
Page. 
Infrpqrtanee of the disease .., 1 
History of walnut blight 2 
The disease in the Eastern States 4 
CONTENTS. 
Page. 
Time ofinfeetion ,„ 5 
Control of walnut blight ,... 5 
Summary I 
IMPORTANCE OF THE DISEASE. 
The growing of the Persian (English) walnut in the eastern half 
of the United States is receiving increasing attention and arousing 
the interest of many. Persian walnut trees, mainly seedlings, either 
isolated or in small groups or orchards, are by no means uncommon 
in the States east of Lake Michigan and the Wabash River below the 
latitude of New England. An indication of the number of such trees 
now growing in this part of the country was contained in an address 
by Prof. F. N. Fagan, of State College, Pa., delivered before the 
Northern Nut Growers' Association in 1915, in which the statement 
was made that as the result of a recent survey by that college the 
"location of some 1,500 or 2,000 bearing trees'' had been ascertained 
in that State. While there has been no effort to make a similar 
survey in other Eastern States, so far as the writer is informed, his 
personal knowledge and that of associates in the Bureau of Plant 
Industry indicates practically the same proportion of Persian walnut 
trees in the States of New York, Delaware, New Jersey, and Mary- 
land. Isolated trees are known in lower Connecticut, southern Michi- 
gan, Ohio, and Virginia. Several eastern nurseries are now spe- 
Note. — This bulletin is intended particularly for all engaged in propagating Persian 
walnuts in those portions of the United States east of the Rocky Mountains. It is also 
of scientific interest to plant pathologists. 
13187*— 17— Bull. 611 
