CONTROL OF PEACH DISEASES IN GEORGIA 
9 
injured by the curculio, brown rot, and scab could be ascertained. 
Throughout the season all dropped fruit under the record trees was 
collected and examined to determine the extent of curculio infesta- 
tion. In the season of 1922, 110,648 peaches were cut open in one 
orchard alone and in the four seasons a total of 551,361. Besides the 
detailed data concerning the fruit from the record trees, data were 
also obtained on the commercial production of merchantable and cull 
fruit from all the trees in each plat. 
In drawing up the outlines for the experiments a special effort was 
made to include schedules which would result in ascertaining the best 
time for making applications of lead arsenate for controlling the 
second brood of the curculio. A number of arsenate-of-lead treat- 
ments were therefore included for tests one month before the ripening 
of the peaches and again 7 to 10 days before ripening, as suitable 
times for making this application. 
Fig. 5.— Peach blossoms, showing curculio feeding marks on the calyces 
Observations by the senior author in Mississippi in 1920, sub- 
stantiated by similar observations in Georgia in 1921, revealed the 
fact that when the adult curculios first appear from hibernation in 
the spring they feed to a considerable extent on the green calyces of 
the peach flower. (Fig. 5.) A number of plats were therefore pro- 
vided to ascertain the results of poisoning the calyces with arsenate 
of lead before the beetles visited them for their first meal. Plats 
were also provided for testing self-boiled lime-sulphur and sulphur 
dust, respectively, one week before the ripening, to determine their 
effectiveness in the prevention of brown rot; and several plats were 
included to compare the efficiency of the spray with that of the dust. 
EXPERIMENTS IN 1921 
An account of the 1921 experiments, including results obtained and 
a detailed discussion of the data, has already been published by the 
Department of Agriculture as Department Circular 216 (7). A dis- 
29519°— 27 2 
