6 BULLETIN 756, U. §. DEPARTMENT OF AGRICULTURE. 
considered healthy, as bearing trees not infrequently show traces of 
the disease at the end of the growing season. 
At the beginning of the experiments there were in the fertilized 
plats 56 badly rosetted trees, 11 rosetted, and 21 healthy. After two 
years the number of badly rosetted trees in the fertilized plats was 
reduced to 7 , and 26 were in the rosetted class—i. e., partially re- 
eovered. The number of healthy trees had been increased from 21 
to 53. Two trees had been killed by winter injury. 
During the same period the healthy trees in the check plats had 
decreased from 29 to 17, the rosetted had increased from 13 to 
94, and the badly rosetted had decreased from 38 to 37. Two were 
dead from winter injury. 
TABLE 1.—Effect of the use of selected fertilizers for the control of pecan rosette 
in southern Georgia during the seasons of 1915 and 1917. 
Per- 
Num- j Badly |p oset- centage 
Fertilizer used. ber of] Date of observation. | roset- ted. |Healthy.)Dead) of 
trees. ted. : healthy 
trees 
ie |sseptember, 1915.....-- 29 10 Tal Sasa 15 
Stable manure. ..-.-------------- 46 \ October, 1917......... 2 9 i6) Pha\ieo ihl\ oe 
Stable manure and cottonseed 15 |\{September, 1915... .- 8 1 6; | eae 40 
THeD Ls ee Oe ee ers se es 3 eee OctoberstOl/peeese oe 1 2 12 | Rees 80 
September, 1915....--- AO) |S eee cot aera 29 
Cottonseed meal. .......-.----.-.- al eetoner, iy feet lence c 4 5 iy 1 65 
= September, 1915...-.-- 27 16 3 | eaeee 6.5 
Lime......------------+++++-+++-- 46 |\ October, 1917..-...... 45 il Reed 0 
i te |fSeptember, 1915...._.- 38 13 29) ee 36 
Check (not fertilized) ..-.....----- 80 October, ei. 0... 37 2, 17 9g Or 
~ DISCUSSION OF THE EXPERIMENTS. 
The figures presented in Table I convey but an inadequate idea of 
the striking change that has taken place in the fertilized plats. 
Figure 1 shows a typical badly rosetted tree at the beginning of the 
experiments in September, 1915. Figures 2 and 3 show the same tree 
in July and October, 1917, respectively. This tree received stable 
manure alone, but the striking improvement shown is quite typical 
of that noted in all the fertilized plats. Larger leaves of dark-green 
color and a marked increase in the circumference of the trunks of 
the trees in the fertilized plats made the contrast with the unferti- 
lized plats most striking. 
Only one lot of trees in these experiments was old enough to bear 
nuts. Of this lot 14 received the stable-manure treatment and 33 
were used as checks and received no fertilizer. These trees were 12 
years old in 1917. The 14 fertilized trees produced 197 pounds of 
nuts the second season, and the 33 unfertilized checks produced 10 
pounds. 
In the last analysis the production of nuts will give the real 
measure of the success of these experiments and the proof of the 
