164 Journal of Agricultural Research (voi.iu.no.j 



no fertilizer for several seasons, and where fertilizer had been applied no 

 distinct difference in the rosette could be detected. 



In the W. P. Bollard orchard near Albany, Ga., 291 out of 646 trees 

 were rosetted in 1912. By the following season loi more trees had con- 

 tracted the disease. Fertilization and cultivation were uniform for the 

 two seasons. 



In a block of 233 trees belonging to Mr. H. K. Miller, at Monticello, Fla., 

 81 trees had the rosette during 1912 and 1913. Fertilization was uniform 

 for both years, and the soil was a sandy loam underlain by a rather stiff, 

 red, sandy clay. 



Observations were taken during 191 2 and 191 3 in three blocks belonging 

 to the Standard Pecan Co., at Monticello, Fla. Out of 406 trees observed 

 in the first block 231 had rosette in 1912 and 254 in 1913. In the second 

 block of 450 trees 119 were rosetted at the first observation and 121 at 

 the second. In the third block of 570 trees, 42 were rosetted in 1912, 

 and 34 in 1 91 3. A part of all three blocks were in swamp land that had 

 not been fully drained, and the absence of rosette here was conspicuous. 

 The soil in the remainder of the three blocks was a sandy loam underlain 

 by a red clay or sandy clay. For three seasons preceding 191 2 a com- 

 plete commercial fertilizer was used. In 191 2 a small application of 

 stable manure was made around each tree. 



In the small orchard of 100 trees belonging to Dr. R. B. Gamett, at 

 St. Augustine, Fla., 3 were rosetted, both in 1912 and 1913, 7 were 

 rosetted but recovered during the second year, and 6 new cases developed 

 during the second year. The soil is a sandy loam underlain by a clear- 

 sand subsoil, with the water table 3 to 3K feet below the surface. Fer- 

 tilization was uniform over the orchard, except that the soil around the 

 10 trees showing rosette in 191 2 was treated with lime and copper sul- 

 phate. Seven of these trees recovered, but no checks were run to verify 

 the result. 



In a block of 371 trees belonging to Mr. M. O. Dantzler, at Orangeburg, 

 S. C, 146 trees had rosette in 1912 and 137 in 1913. Fertilization and 

 cultivation were uniform during the two seasons. 



It is evident from these records that rosette fluctuates from year to 

 year without any variation in the treatment given by the grower and that 

 diseased trees may apparently make a complete recovery and remain 

 healthy for an indefinite period, or after a season or two they may again 

 contract the disease. It should be stated here that in the majority of 

 cases the trees recovering from rosette had not reached the staghorn 

 stage. However, a considerable number of trees with terminals dying 

 back from the disease have been seen to recover and remain normal 

 through the one or more seasons they have been subsequently under 

 observation by the authors. From the variations in rosette recorded 

 from year to year under uniform cultivation and fertilization it seems 



