260 



a more detailed treatment than is consistent with the scope and object 

 of this preliminary report. 



TABLES OF CROP REDUCTION AND LOSSES. 

 TABLE 1. — Estimated Wheat Losses from Leiaf Rust. 1919-1923 



TABLE 2. — Seasonal Variation in amount of Leaf-Rust Infectioh 



OF Wheat 



Year 



Acres exam- 

 ined 



Per cent of 



stalks 



infected 



Per cent of 

 diseased leaf- 

 tissue on in- 

 fected plants 



Average per 

 cent of leaf- 

 tissue diseased 



1918* 



1922 



1923 



350 



310 



1833 



83 

 98 

 86.! 



12 

 57 

 36.6 



10 



55.8 



31.76 



TABLE 3. — Comparison of Loss in Wheat from Le.vf Rcst 



WITH Number of Infected Plants and Amount of 



Diseased Leaf-Tissue 



• U. S. Dept. Agr. Plant ni.sea.-ise Survey Bulletin. Supplement 4 131. 1919. 



