Apr. 3, 1916 



Climatic Conditions and Cercospora beticola 43 



Table 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 igij — Continued 



Pknt 



No. 



*** +3 



***8 



***f 8 



Leaf 

 No. 



Spot 

 No. 



Graph 

 values. 



Data on life histories. 



1913- 

 Aug. s 



Sept. 



Aug. 



tt8 



Sept. 



75 

 100 

 75 

 69 

 100 

 87 

 75 

 69 

 62 



Conidiophores very few on both surfaces. Aug. 7, no change. 

 Conidia numerous on both surfaces. Aug. 11, no change. 

 Conidia abundant on both surfaces. Aug. 15, no change. 

 Conidia few above and abundant below. 

 Conidia fairly numerous above and numerous below. 

 Conidia abundant on both surfaces. 

 Conidia fairly abtmdant on both surfaces. 

 Conidia numerous on both surfaces. 

 Conidia fairly numerous above and numerous below. 

 Conidia fairly numerous and matted above and fairly numerous 

 below. 



No conidiophores on either surface. Aug. 7, 9, no change. 

 Conidia very few above and nothing below. 

 Conidia abundant above and numerous below. 

 Conidia fairly abvmdant above and abundant below. 

 Conidia numerous above and abundant below. 

 Conidia abundant on both surfaces. 



Conidia abimdant above and fairly numerous and matted 

 below. 



Condiophores few above and conidia few_ below. 



Conidiophores niunerous above and conidia numerous below. 



Coaidia numerous above and abundant below. 



Conidia few above and none below. 



Conidia numerous and matted above and numerous below. 



Aug. 15, no change. 

 Conidia numerous above and abundant below. 



Conidiophores few on both surfaces. 



Conidia very few above and few below. 



Conidia numerous on both surfaces. Aug. 15, no change. . 



Conidia numerous above and abundant below. 



Conidia very few and matted above and fairly abundant below. 



Conidia numerous and matted above and abundant below. 



Conidia few above and abundant below. 



Conidia numerous and matted above and abundant below. 



Conidia numerous and matted above and fairly abvmdant 



below. 

 Conidia few and matted above and fairly abundant below. 

 Conidia very few and matted above and fairly numerous and 



matted below. 

 Conidia none above and fairly numerous and matted below. 



No conidiophores on either surface. 



Conidia fairly numerous and matted above and abundant 



below. Aug. 7, no change. 

 Conidia fairly numerous and matted above and numerous 



below. 

 Conidia numerous above and few below. 

 Conidia abundant on both surfaces. 

 Conidia fairly numerous and matted above and abundant 



below. Aug. 18, no change. 

 Conidia few and matted above and numerous below. Aug. 23, 



no change. 

 Conidia none above and numerous below. 

 Conidia none above and fairly abimdant below. 



No conidiophores on either surface. 



Conidiophores few above and none below. 



Conidia very few on both surfaces. 



Conidia very few above and few below. 



Conidia fairly numerous on both surfaces. 



Conidia numerous above and fairly numerous below. Aug. 30. 



Sept. I, no change.. 

 Conidia fairly numerous and matted above and fairly numerous 



below. 

 Conidia few and matted on both surfaces. 

 Conidia very few on both surfaces. Sept. 10, no change except 



matted on both surfaces. 



