1 62 Journal of Agricultural Research [voi. rii, no. 2 



As will be observed from the data given, the results were largely 

 negative. There were no signs of recovery, and in the case of stable 

 manure (plot 10), lime (plot 12), and cottonseed meal (plot 13), there was 

 an increase in the number of resetted trees. It should be noted that 

 most of the trees having rosette at the start were well-advanced cases. 



At the same time, the subsoil was dynamited around three 15-year-old 

 resetted trees in the orchard of Mr. G. G. Gibbs. The results in this 

 case were likewise negative as shown by observations after one and two 

 years. The results of dynamiting the subsoil in these two orchards, 

 together with obser\'ations showing the absence of pecan rosette in 

 swampy land, seem to indicate that the disease is not due directly to 

 lack of proper subsoil drainage. 



The soil around two resetted trees in the J. B. Wight orchard, Cairo, 

 Ga., in the spring of 1907, was treated with copper sulphate and mag- 

 nesium sulphate at the rate of i pound of each for every inch in diameter 

 of the trunk. The trees were decidedly injured by this treatment, and 

 the diseased condition continued as before. A negative result followed 

 the use of 8 pounds of copper sulphate around a single 9- year-old resetted 

 tree at Bacenton, Ga. 



The soil around each of 22 resetted trees in the 4- year-old Davenport 

 orchard at Belleview, Fla., was treated in June, 191 2, with 2 to 4 pounds 

 of copper sulphate, according to the size of the tree. By the following 

 midsummer 7 trees had recovered, 7 were somewhat improved in appear- 

 ance, and 8 were either in the same or in a worse condition than at the 

 beginning. In the same 40-acre block, 117 out of 389 resetted trees 

 had recovered in. the same period. In ether words 31 per cent of the 

 trees treated with copper sulphate recovered and also 30 per cent of the 

 untreated trees in the same block. A considerable number of the 

 untreated trees were also improved in appearance. Both groups of 

 trees were fertilized by the owner with a complete commercial fertilizer 

 at the rate of 8 pounds to the tree. 



The copper-sulphate treatment has from time to time been recom- 

 mended by a number of orchardists, and in a few cases observed by the 

 junior author some apparently beneficial results have occurred. But the 

 usual failure of the grower to run proper checks with an experiment, to- 

 gether with the fluctuation of the disease without any treatment, lends a 

 rather doubtful character to the results. At any rate, this treatment is 

 not to be recommended, except in an experimental way, until further 



tested out. 



SPRAYING EXPERIMENT 



Five resetted trees in the J. B. Wight orchard at Cairo, Ga., were 

 given three applications of Bordeaux mixture — in March, April, and 

 May, 1903. No positive results from this experiment were discernible. 



