Apr. 3, 1916 



Climatic Conditions and Cercospora heticola 



41 



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. 



Data on life histories. 



1913- 

 July 7 



June 24 



27 

 July 7 



16 

 21 



88 

 75 

 100 



63 



75 

 100 



No conidiophores above, very few conidia forming below. 

 Conidiophores on upper surface, few conidia on lower. 

 Conidia numerous above and very abundant below. 

 Conidia few above and abundant below. July 14, no change. 

 Conidia abundant on both surfaces. July 23 (leaf yellow). 



July 25, no change. 

 Conidia few above and numerous below. 

 Conidiophores on both surfaces. 

 Conidia few above and conidiophores below. July 12. no 



change. 

 Conidia few on both surfaces. 



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

 Conidia few on both surfaces. 

 No conidia on either surface. 



Conidiophores none above and forming below. 



Conidiophores on both surfaces. 



Conidia few above and very abundant below. July 12, 14, 16, 



no change. 

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

 Conidia very few above and numerous below. 

 Conidia none above and few below. 



10 No conidiophores on either surface. 

 17 Conidiophores none above and forming below. 

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

 Conidia abundant above and few below. 



s6 

 62 

 100 



IS 

 75 

 5° 

 100 



Conodiophores on both surfaces. 

 Conidia numerous on both surfaces. 



Conidia very few on either surface but more on lower. July 8, 



no change. 

 Conidia few above and abundant below. 

 Conidia abundant on both surfaces. July 14. 16, 21. no change. 



Conidiophores forming above and conidia few below. July 8, 

 no change. .j. .. j ^ 



Conidiophores well developed above and conidia abundant 

 below. 



Conidia very few above and abundant below. 



Conidia few above and abundant below. July 16, no change. 



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



No conidiophores on either surface. 



Conidiophores above and none below. 



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



Conidia few above and numerous below. 



Conidiophores on both surfaces. 



Conidia very few above and abundant below. 



Conidia few above and numerous and matted below. 



No conidiophores on either surface. 



Conidiophores very few above and abundant below. June 26. 

 no change. 



Conidiophores above and conidia very few below. June 28. 



30, July I. 2 (leaf dying), no change. 

 Conidiophores, but no conidia present. 



No conidiophores on either surface. 

 Conidia few above and fairly numerous below. 

 Conidia none above and abundant below. 

 Conidia abundant on both surfaces. July 14, 16, 21, 23. ^5. 

 no change. 



Conidiophores forming on upper surface only. 



Conidia abundant above and few below. 



Conidia few on either surface. July 16, no change. 



Conidia abundant on both surfaces. July 33, 25, no change. 



No conidiophores on either surface. 

 Conidia abundant on both surfaces. 



July 23, 25, no change. 



