1 66 



Journal of Agricultural Research 



[Vol. ni. No. 3 



Table V. — -4rA analyses of leaves and twigs of the Schley pecan from Putney, Ga., 



September, IQ13 



Constituent. 



Total percentage of pure ash 



SO3 



P2O5 



CI 



K,0 



NajO 



CaO 



MgO 



FejOs 



AI2O3 



MnsO, 



SiOj 



Total 



Leaves. 



Rosetted. Normal 



Per cent, 



4. 72 



6.76 



6.23 



.69 



23-03 



•49 



35- 12 



16.74 



3-03 

 I. 19 

 6-45 



104. 45 



Per cent. 

 4.78 

 5-83 



6. 52 

 .26 



14. 12 



•34 

 42.04 

 16. 42 



4.84 

 2.44 

 7- 23 



104. 82 



Stems. 



Rosetted. Normal, 



Per cent. 



2. 16 



6.49 



6. 40 



•38 



22.37 



2.82 



40. 04 



16.9s 



1-43 



.61 



I. 76 



loi. 41 



Per cent. 



2. 18 



s- 



7- 



19. 



2 



42 



19. 



28 

 32 

 03 

 S' 

 27 

 23 



09 



74 



loi. 99 



Most of the differences between the pure ash of healthy and of rosetted 

 material were not constant in the three sets analyzed. In both leaves 

 and twigs from Cairo, Ga., the magnesium content was much higher in the 

 diseased material, but in the two other sets the percentage was nearly 

 the same in both diseased and healthy material. 



The percentage of phosphorus was greater in the normal leaves of two 

 sets and in the normal twigs of one set. In the other cases the percentage 

 was about the same in both healthy and diseased material. 



The calcium content was greater in the normal leaves and twigs of two 

 sets and considerabh' less in the remaining set of material. 



The percentage of potassium was greater in all the rosetted material, 

 with the exception of one set of rosetted and normal twigs, where there 

 was slightly more potassium in the normal. 



Other differences shown by the analyses are either slight or greatly 

 variable. 



DISCUSSION OF RESULTS 



PARASITISM VERSUS NONPARASITISM 



The following experimental data have a bearing on the question of 

 possible parasitism or upon nonparasitism. 



Out of 144 nuts collected in different localities from badly rosetted 

 branches, 91 germinated and none of the seedlings gave symptoms of the 

 disease during the two seasons under observation. These nuts were 

 placed in the greenhouses of the Department of Agriculture at Washing- 

 ton, D. C, which is far removed, both as to locality and environment, 

 from the orchards where the nuts were obtained, but the conclusion from 



