PAPERS ON BIOLOGY AND AGRICULTURE 93 



The reduction in yield or the loss in money value can 

 not be arrived at for many crops because of the lack of 

 production and price statistics, but the reductions indi- 

 cated in the table of 112,462,000 bushels of cereals valued 

 at $73,415,000, of 1,381,000 bushels of fruits valued at 

 11,669,000, and of 199,000 bushels of vegetables valued 

 175,000, the whole reduction totalling- 114,042,000 

 bushels valued at $75,259,000, should be sufficient to im- 

 press upon every one the importance to agriculture in 

 Illinois of undertaking a comprehensive and effective 

 plant-disease-control program. 



For the control of these diseases there are now avail- 

 able methods suitable to every crop. The disinfection 

 of seed for seed-borne diseases among cereals and . 

 tables, the application of effective sprays for disease of 

 fruits and vegetables, the eradication of alternate hosts 

 for certain diseases of cereals and fruits, and the use of 

 resistant varieties for diseases not amenable to oilier 

 treatment are already used to a limited extent and have 

 been found to be so generally effective that a more ex- 

 tensive use is greatly to be desired. 



