40 



Journal of Agricultural Research 



Vol. VI, No. I 



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

 lo plants in a tnedium-early sugar-beet field near Rocky Ford, Colo., durinq the season 

 of jpij — Continued 



Plant 

 No. 



No. 



Spot 

 No. 



Graph 

 values. 



Data on life histories. 



1913. 

 July 7 



June 24 



July 



June 24 



July 8 



Conidiophores forming above, nothing below. 



Conidiophores above, conidia very few below. 



Heavy production of conidia on both surfaces. July 12, 14, 16, 



21, 23, no change. 

 Conidia few above and numerous below. 



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

 July 1,2,7 (leaf yellow), 8, no change. 



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

 July I, 2, 7, 8, no change. 



No conidiophores on either surface. 

 Conidiophores forming only on lower surface. 

 Conidiophores abundant above and conidia abundant below. 

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

 Conidia very few above and abundant below. 

 No conidia on either surface. 



No conidiophores on either surface. July 8, no change. 



Conidiophores abundant on both surfaces. 



Conidia abundant on both surfaces. July 14, 16, 21 (center of 



spot gone), no change. 

 Conidia fairly abundant above and abundant below. 

 Conidia few on both surfaces, leaving and leaf yellowing. 



No conidiophores on either surface. July 8, no change. 

 Conidiophores abundant on both surfaces. 

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

 Conidia fairly abundant above and abundant below. 

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

 Conidia few on both surfaces. 



No conidiophores on either surface. July 8, no change. 

 Conidiophores abundant on both surfaces. 

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

 Conidia fairly abundant above and abundant below. 

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

 Conidia few above and abimdant below. 



Conidiophores numerous above and few below. 



Conidia few above and very few below. 



Conidia few and matted together on both surfaces. 



No conidiophores on either surface. June 25 (leaf dying), 26 

 (leaf dead), 27, 28, 30, July i, no change. 



No conidiophores on either surface. 

 Conidia fairly numerous on both surfaces. 

 Conidia leaving, few on both surfaces. July 16, 21 (leaf dead), 

 no change. 



No conidiophores on either surface. July i, 2, no change. 

 Conidia forming on both surfaces. July 8, no change. 

 Only conidiophores on both surfaces. 

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

 Conidia fairly abimdant on both surfaces. July 21, 23, no 



change. 

 Conidia few on both surfaces. 



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

 Conidia numerous on both surfaces. 



No conidiophores on either surface. July 2, 7, 8, no change. 



No conidiophores on either surface. July 7. no change. 

 Conidiophores forming only on upper surface. 

 Conidiophores above and conidia forming below. 

 Conidia few on both surfaces. 



Conidia very few above, and fairly nimierous below. 

 Leaf dead, no change in spot. 



