Apr. 3, 1916 Climatic Conditions and Cercospora beticola 



45 



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 igij — Continued 



Plant 

 No. 



n,{ 



Leaf 

 No. 



tts 



tt,§8 



'Spot 

 No. 



1913- 

 Aug. 3 



Sept. 



Graph 

 values. 



69 



100 



56 



Data on life histories. 



Conidiophores above and conidia very few below. 



Conidia fairly numerous on both surfaces. 



Conidia numerous above and fairly abundant below. 



Conidia numerous above and abvmdant below. September i. 



no change. 

 Conidia fairly numerous above and fairly abundant below. 

 Conidia fairly numerous and matted above and numerous and 



matted below. September 8, 10, no change. 

 Conidia very few and matted above and numerous below. 



September 15, 17, no change. 

 Conidia none above and numerous below. 



No conidiophores on either surface. 



Conidia very few above and nothing below. 



Conidia few above and very few below. September i, 3, 6, no 



change. 

 Conidia few on both surfaces. 

 Conidia fairly numerous above and few below. 

 Conidia very few above and few below. 

 Conidia fairly numerous and matted above and numerous 



below. 

 Conidia very few and matted above and few below. 

 Conidia none above and very few below. 



Conidiophores forming above and nothing below. 



Conidia fairly abundant in center of both surfaces. 



Conidia abundant in center of both surfaces. September 1,3, 



6, no change. 

 Conidia fairly numerous above and numerous below. 

 Conidia abundant on both surfaces. September 13, 15, no 



change. 

 Conidia few and matted above and fairly numerous and matted 



below. 

 Conidia very few and matted above and fairly numerous and 



matted below. 



No conidiophores on either surface. 



Conidia fairly abvmdant in center on both surfaces. 



Conidia fairly abimdant in center above and abundant in 

 center below. September i, 3, no change. 



Conidia fairly abundant and matted above and fairly abimdant 

 below. September 8, no change. 



Conidia fairly abundant above and abimdant below. Septem- 

 ber 13, no change. 



Conidia numerous and matted above and abundant below. 



Conidia fairly numerous and matted above and fairly abund- 

 ant below. 



Conidia few and matted above and numerous below. 



Conidia very few on both surfaces. 



Conidia few above and fairly numerous and matted below. 



Conidia numerous and matted above and fairly abundant 

 below. 



Conidia numerous above and abundant below. September i, 

 no change. 



Conidia fairly numerous and matted above and abundant be- 

 low. September 6, 8, no change except conidia matted 

 below. 



Conidia fairly numerous and matted above and fairly abundant 

 and matted below. 



Conidia few and matted above and fairly abundant and matted 

 below. 



Conidia none above and numerous and matted below. 



Conidia none above and very few and matted below. 



Conidia none on either surface. 



No conidiophores on either surface. 



Conidia few above and conidiophores forming below. 



Couidia very few above and nothing below. 



Conidia very few above and few conidiophores below. Septem- 

 ber 3, no change. 



Conidia few above and very few below. 



Conidia few and matted above and few below. 



Conidia few and matted above and very few below. Septem- 

 ber 13, 15, 17, no change. 



Conidia none on either surface. 



