48 



Journal of Agricultural Research 



Vol. VI. No. I 



TablB IV. — Data on life histories of a representative number of leaf spots studied on 

 10 plants in a medium-early sugar-beet field near Rocky Ford, Colo., during the season 

 of ipij — Continued 



_ co/v/o/^ /OO.O 





jrfl/t/ O C c/ 





C0A^/£/0P»O^£^ 



/oo 



i^j RJ -Xl <0 



Fig. 6. — Curves of the leal spot history series, showing the production of conidia on different dates from 

 June 24 to September 19, 1913, at Rocliy Ford, Colo. 



After the values were all assigned, the spots which appeared on or about 

 the same day were brought together in 24 groups and averaged (Table V 

 and fig. 6). The temperature and humidity records used in the correla- 

 lations with the leaf spot histories were taken among the sugar-beet leaves 

 near the surface of the ground. 



