12 



James G. Horsfall 



Losses induced by diseases in meadows 



According to the New York State Crop Report (January, 1928), 852,000 

 tons of clover hay, 3,532,000 tons of clover and timothy mixed, and 569,000 

 tons of alfalfa were produced in the State in 1927. The approximate total 

 yield of clover for that year, found by adding half the yield of clover and 

 timothy mixed to that of clover alone, was 2,618,000 tons. 



The calculation of the loss in tons for table 3 may be illustrated by the 

 Pseudopeziza leaf spot of red clover. A loss of 4.62 per cent means that 

 the total yield for the State of 2,618,000 tons is only 95.38 per cent of what 

 it would be were this disease not present. The total yield is divided by 

 95.38, the quotient is multiplied by 100, and the total yield is subtracted 

 from the figure obtained, to give the loss in tons. The same method used 

 in calculating the losses from clover diseases is applied to alfalfa diseases 

 because it undoubtedly is better than a guess as to the loss involved. 



TABLE 3. Summary of Meadow-Crop-Disease Records, Legumes 



* Anthracnose is not admissible to the loss calculations which apply to leaf-spot diseases only, 

 t Mosaic probably is not accurately figured by this method. 

 t Apparently a new record for the State. 



