840 
Journal of Agricultural Research 
Vol. XXXI, No. 9 
of the Helminthosporium disease. This is supported by the results 
obtained by Dickson, Eckerson, and Link (3) with two hosts (corn 
and wheat) which possess different disease-temperature optima when 
attacked by G . saubinetii . It will be especially important to inves¬ 
tigate these problems further, not only by the use of additional 
hosts and one parasite but by employing one host and several para¬ 
sites which possess different disease-temperature optima. Unques¬ 
tionably H. sativum , 0. graminis, and the wheat plant offer oppor¬ 
tunities in this direction. 
( 1 ) 
( 2 ) 
(3) 
(4) 
(5) 
( 6 ) 
(7) 
( 8 ) 
(9) 
( 10 ) 
(ID 
( 12 ) 
(13) 
(14) 
(15) 
(16) 
(17) 
LITERATURE CITED 
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disease of wheat. Jour. Agr. Research. [In press.] 
Dickson, J. G. 
1923. influence of soil temperature and moisture on the develop¬ 
ment OF THE SEEDLING-BLIGHT OF WHEAT AND CORN CAUSED 
by gibberella saubinetii. Jour. Agr. Research 23: 837-870, 
illus. 
- Eckerson, S. H., and Link, K. P. 
1923. THE NATURE OF RESISTANCE TO SEEDLING BLIGHT OF CEREALS. 
Proc. Nat. Acad. Sci. 9: 434^-439, illus. 
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