Apr. 3, 1916 Climatic Conditions and Cercospora beticola 



47 



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 



Plant 



No. 



Leaf 



No. 



Spot 

 No. 



1913- 

 Sept. 6 



17 

 June 24 



July 9 



June 30 



July 



Graph 

 values. 



Data on life histories. 



87 

 100 

 37 



No conidiophores on either surface. September 8, 10, no 



change. 

 Conidiophq^'es forming above and conidia very few below. 



September 15, 17, no change. 



No conidiophores on either surface. September 8, 10, 13, 15, 17, 

 no change. 



No conidiophores on either surface. September 8, 10, 13, no 



change. 

 Conidiophores none above and forming below. 

 Nothing above and very few conidia below. 



No conidiophores on either surface. September 19, no change. 



No conidiophores on either surface. September 19, no change. 



No conidiophores on either surface. Jime 25, 26, 27, 28, 30; 

 July I, 2, 7, no change. 



No conidiophores on either surface. 

 Conidiophores abundant on both surfaces. 

 Conidia fairly abundant on both surfaces. July 14, no change. 

 Conidia abundant on both surfaces. 



Leaf dead, conidia very few on both surfaces. July 25, 28, no 

 change. 



Conidia few on both surfaces. July 23, 25, no change. 

 Conidia none above and few below. July 30, no change. 



Conidiophores above and none below. 



Conidia numerous on both surfaces. July 28, 30, no change. 



No conidiophores on either surface. 

 Conidia few above and conidiophores abundant below. 

 Conidia abundant above and fairly abundant below. July 14, 

 16, no change. 



No conidiophores on either surface, 

 change. 



No conidiophores on either surface. 

 Conidiophores few above and abundant below. 

 Conidiophores above and conidia few below. 

 Conidia numeroxis on both surfaces. July 12, 14, no change. 

 Conidia abundant on both surfaces. July 21, 23, no change. 

 Conidia few above and abundant below. 



Conidia none above and numerous below. Leaf dead. July 

 30, no change. 



July I, 2, 7, 9, 10, 12, no 



Conidia few on both surfaces. July 23, no change. 

 Conidia fairly numerous above and few below. 

 Conidia none on either surface. July 30, no change. 



Conidiophores above and conidia few below. 



Conidia very few above and few below. 



Conidia very few on both surfaces. 



Conidia none on either surface. July 30, no change. 



No conidiophores on either surface. 



Conidia very few above and conidiophores below. 



Conidia fairly numerous on both surfaces. July 10, 12, 14, no 



change. 

 Conidia few above and fairly numerous below. 



No conidiophores on either surface. 

 Conidiophores none above and very few below. 

 Conidiophores above and conidia few below. 

 Conidia abundant on both surfaces. July 23, 25. 28, 30, no 

 change. 



27469'*— 16- 



