154. Journal of Agricultural Research voi.ui. No. 2 



rosette, 3 had doubtful traces, while 4 were normal. During the follow- 

 ing winter part of the vacant places were filled from the nursery, mak- 

 ing 38 trees in all. No further observations were made until the summer 

 of 1910, at which time no traces of the disease were apparent. In 

 August, 1912, 18 trees were normal, 12 were distinctly resetted, while 6 

 showed traces of the disease. The following August, 31 trees were 

 normal, 2 were distinctly resetted, and 3 showed traces of the disease. 

 Throughout the experiment the trees received no pruning, and little 

 attention of any kind save an occasional cultivation and moderate appli- 

 cations of a complete commercial fertilizer. 



In December, 1903, 6 nursery trees showing symptoms of rosette were 

 taken up at Dewitt, Ga., and sent by Mr. Herbert C. White to Washing- 

 ton, D. C. During the latter part of November, 1904, a like number of 

 resetted nursery trees were sent by Mr. J. B. Wight from Cairo, Ga. 

 Upon receipt these trees were potted in garden soil and placed in one of 

 the greenhouses of the Department of Agriculture. All the trees lived, 

 but observations up to January, 1907, gave no evidence of rosette in 

 any of them. At this time 4 were set out at Takoma Park, D. C, 4 at 

 Glen St. Mary, Fla., along with the trees described in the preceding 

 experiment, and the remaining 4 were left in the greenhouse. The 

 Takoma Park trees died from other causes after the second winter, but 

 showed no more rosette. The 4 trees set at Glen St. Mary, Fla., were 

 healthy during 1910 and 191 1. In August, 1912, i tree showed a 

 trace of rosette, but the following season all 4 were healthy. The green- 

 house trees remained healthy until destroyed the next year to close the 

 experiment. 



In the winter of 191 2, 5 Stuart nursery trees which had reached the 

 staghom stage of rosette were sent by Mr. H. K. Miller from Monticello, 

 Fla., to Washington, D. C, where they were potted in garden soil and 

 placed in one of the Department greenhouses. The trees were rather 

 large for potting, and therefore both roots and tops were severely pruned. 

 Probably as a result of this severe treatment, together with the almost 

 entire absence of lateral roots, the tops of all 5 trees died, but the follow- 

 ing season 3 sent up sprouts from the crown. These shoots have made 

 a perfectly normal growth for three seasons and have at no time shown 

 the faintest traces of rosette. 



In 1910 a badly resetted Stuart pecan tree in the orchard of Dr. R. B. 

 Garnett, at St. Augustine, Fla., was taken up by the owner and reset 

 in another part of the place. The following winter 5 badly diseased 

 young orchard trees were taken up and reset about a quarter of a mile 

 distant. Observation by the junior author in August, 1912, showed 

 the Stuart tree to be entirely recovered. Three out of the second group 

 were entirely normal in appearance, while two still had symptoms of the 

 disease. 



