LETTER OF TRANSMITTAL. 
U. S. Department of Agriculture, 
Bureau of Entomology, 
Washington, D. C, June 8, 1910. 
Sir : I have the honor to transmit herewith for publication a manu- 
script entitled "The Grape Root- Worm, with Especial Reference to 
Investigations in the Erie Grape Belt from 1907 to 1909," by Fred 
Johnson and A. G. Hammar, agents and experts, of this Bureau. 
The grape root-worm is by far the most serious pest of American 
varieties of grape at the present time and its ravages have caused a 
great depreciation in the value of vineyard properties as well as a 
marked reduction in the yield of fruit. The present report furnishes 
a careful account of the life history and habits of the pest, embodies 
a report on the work undertaken by the Bureau of Entomology in 
the spring of 1907 in the Erie Grape Belt, at the instance of vine- 
yardists, and provided for by Congress, and points out practical 
remedial measures whereby the vineyardists will be able largely to 
avoid future losses. 
During the years 1908 and 1909 the work has been in cooperation 
with the office of the zoologist of the Pennsylvania state department of 
agriculture, as further detailed in the preface. 
I recommend the publication of the accompanying manuscript as 
Bulletin No. 89 of this Bureau. 
Respectfully, R. S. Clifton, 
Acting Chief of Bureau. 
Hon. James Wilson, 
Secretary of Agriculture. 
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