44 N. J. Agricultural Experiment Stations Bulletin 356 



trees on the plots that had received nitrogen or stable manure. A still 

 smaller quantity of starch was found in the roots of the trees in the 

 younger orchard. The starch content in the roots of vigorous yellows 

 trees was in excess of that in the slow growing normal trees. The 



Fig. 24 — Yellows Developing on a Healthy Seedling the Summer 



Following Budding With a Diseased Fitzgerald Bud. The Latter 



Failed to Grow, But the Disease Was Transmitted 



early storage of starch by trees in good vigor, therefore, indicates 

 that the total quantity of starch stored should be large. Examinations 

 of roots of very weak trees showed that the starch content of the 

 roots was less than in the case of vigorous rapidly growing trees. 

 This would be expected, since the foliage on such trees would be 

 weak and scanty and incapable of producing much starch. It was 

 also noted that there was some variation in starch content between 

 different roots of the same tree. 



