CONTROL OF PEACH DISEASES IN GEORGIA 29 
whereas the "drops" of Plat I, which was sprayed according to sched- 
ule, had an infestation of 6.2 per cent (Table 19). The infestation 
of the "drops" was not lowered by an application of dust after each 
rain, as Plat IV, treated in that manner, had an infestation of 8.4 
per cent, whereas Plat III, which was dusted at the several times 
specified, suffered an infestation of 8.5 per cent (Table 19). 
The spray continued to show its superiority over the dust for 
curculio, brown-rot, and scab control. Of the fruit harvested from 
Plat III, which was dusted according to the recommended schedule, 
30.7 per cent was "wormy," 8.4 per cent rotten, and 44.9 per cent 
scabby; whereas of the fruit harvested from Plat I, which was 
sprayed according to the recommended spray schedule, 21.9 per cent 
was "wormy," 6.9 per cent rotten, and 23.3 per cent scabby. The 
control in all of the treated plats of Elberta peaches can not be called 
excellent, but in interpreting the results one must first consider the 
very severe test to which all treatments were put. The value of 
spraying is clearly demonstrated in the work, however, by comparing 
in Table 18 the data for Plats I and V. Spraying increased the 
harvested sound fruit 55 per cent on Plat I, as compared with Plat V, 
which was untreated. 
The two applications of self-boiled lime-sulphur to Plat I gave good 
control of brown rot and scab, considering the weather conditions 
and the severity of the test. For this plat the infection of brown rot 
was 6.9 per cent and that of scab 23.3 per cent, whereas for the check 
plat the infection of brown rot was 30.3 and that of scab 89.7 per 
cent (Table 18). Colloidal sulphur, applied to Plat II, again gave 
good control of brown rot, and fair control of scab (Table 18), but in 
the treatment of the Hiley peaches such serious defoliation had 
resulted from the use of this material in combination with arsenate of 
lead without lime that lime was added to each application in which 
the combination was used on the Elberta peach trees. The addition 
of lime reduced the severity of the injury, but did not completely 
eliminate it. 
Plat IV, which received an application of dust after each rain until 
two weeks after the shedding of the calyces, did not control the 
curculio quite so well as the spray applied to Plat I at the specific 
times recommended, but gave better control than the four applica- 
tions of dust to Plat III. The infestation of Plat IV was 24.4 per 
cent (Table 18), and the infestations of Plats I and III 21.9 and 30.7 
per cent, respectively. 
From Table 20 it may be seen that no merchantable fruit was 
harvested from Plat V, untreated. Plat IV, treated with both dust 
and spray, and Plat I, sprayed according to the recommended sched- 
ule, bore the minimum of cull fruit. 
CONCLUSIONS 
The following conclusions are drawn from the results of the experi- 
ments in spraying and dusting peaches, conducted for four years and 
reported upon in this bulletin. A numerical summary of these 
results is presented in Table 21. 
An application of arsenate of lead, when 75 per cent of the petals 
have fallen, materially reduces the curculio infestation in the small 
peaches that drop to the ground before maturing. In seasons in 
