14 
efficiency of either the insecticide or the fungicide. The fruit har- 
vested from Plat II (Table 4) was found to have a curculio infestation 
of 3.4 per cent and a brown-rot infection of 0.6 per cent, as compared 
with a curculio infestation of 1.8 per cent and a brown-rot infection 
of 1.1 per cent for Plat I (Table 4). Plats I and II were sprayed at 
the same times and with the same materials, except that calcium 
casemate was added to each application for Plat II. 
The sulphur, lime, and calcium casemate used in Plat V controlled 
brown rot and scab, but the burning of the foliage from the use of 
this fungicide in combination with arsenate of lead was so severe that 
the size and flavor of the fruit were affected. The trees were entirely 
defoliated by September, more than a month before they would 
normally have shed their leaves, and this injury seems to have 
affected the vitality of the fruit buds for the succeeding year, as 
revealed by the size of the crop on these trees in 1923. Because of 
risk of severe injury, the mixture of sulphur, lime, and calcium 
caseinate tested this year could not be recommended for use in 
Georgia against brown rot and scab, at least when used with arsenate 
of lead. As shown in Table 4, the percentage of harvested fruit 
affected with brown rot was much less in all the treated plats than 
in the check plat; the percentage of rotted fruits averaged somewhat 
lower in the sprayed plats than in the dusted plat. The late applica- 
tion of dust in Plat IV, which had previously received two applications 
of self-boiled lime-sulphur at the regular times, made no appreciable 
difference in the control of brown rot. The dropping of fruit before 
harvest time is not considered in the brown-rot data, as the counts 
showed that very little brown rot developed until the fruit was ready 
for harvest. 
Scab was well controlled by all of the fungicides used in the experi- 
mental work for 1922. Table 4 shows that the scab infection of the 
fruit harvested from all sprayed and dusted plats was less than 1 per 
cent. The infection of scab was 64.9 per cent on the fruit harvested 
from the record trees in the check, or untreated, plat. 
Table 6 shows that when the fruit from Plat VII was graded 50 
per cent of it was thrown into the culls. Furthermore, these untreated 
trees matured an average of only 13^3 crates of merchantable fruit per 
tree, as compared with an average of from 2% to 3% crates for the 
trees in the plats that were sprayed or dusted. 
EXPERIMENTS IN 1923 
Since the experiments in 1921 and 1922 had shown the treatment 
with arsenate of lead four weeks before the ripening of the fruit to 
be of importance in the control of the curculio, it was decided without 
further experimentation to incorporate it in the regular schedule. 
The testing of the early treatment for the poisoning of adult curculios 
directly after their emergence from hibernation was continued. The 
effectiveness of four applications of a spray containing three-fourths 
of a pound of arsenate of lead to each 50 gallons of spray was com- 
pared with three applications of spray containing 1 pound of arsenate 
of lead to each 50 gallons. Tests as to the desirability of adding 
calcium caseinate as a " sticker" or " spreader" were continued, and 
two different formulas of the spray containing sulphur, -lime, and 
calcium caseinate were tested for control of brown rot and scab. 
These formulas were thought to be an improvement on the formula 
