CONTROL OF PEACH DISEASES IN GEORGIA 13 
A study of Table 4 shows that there was a moderate infection of 
brown rot and, for central Georgia, a heavy infection of scab. There 
was a moderately heavy infestation of curculio, although this infesta- 
tion in the untreated or check plat was not so heavy as in that of 
1921. Of the fruit from the check plat, 22.9 per cent was infested 
with the curculio; 32 per cent showed brown-rot infection, and 64.9 
per cent infection with scab. 
To determine the effect of early spraying on the control of the 
curculio all of the small peaches that drop to the ground before 
maturity must be examined, as the early applications of arsenate of 
lead are directed especially against injury by the curculio to the 
small peaches. The efficiency of an early application of arsenate of 
lead as a killer of adult curculios, as they appear from hibernation 
and before they have had an opportunity to deposit eggs, was again 
clearly demonstrated in the work of this year. Table 5 shows that 
of the " drops" from plat III, which did not receive the early arsenate- 
of-lead treatment, 25.7 per cent were infested with curculio, whereas 
the percentages of infestation in the four plats (I, II, IV, and V) 
which received the early treatment averaged but 14. According to 
these results the application of arsenate of lead when 75 per cent 
of the petals had fallen reduced the number of curculio-infested 
fruits nearly 50 per cent. A reduction of the amount of curculio 
infestation in the " drops" correspondingly reduced the size of the 
second brood of larvae which may attack the peaches later in the 
season. 
The value of an application of arsenate of lead four weeks before 
the fruit is due to ripen, for the control of overwintered females 
which may deposit eggs throughout the fruit growing season, or for 
the control of a second brood of curculio, is shown in Table 4, which 
contains the data on the harvested fruit alone. Of the fruit har- 
vested from the record trees on Plat III, which did not receive the 
late arsenate-of-lead treatment, 17 per cent was infested with cur- 
culio, whereas the percentages of infestation in the fruit harvested 
from Plats I, II, IV, and V, which received the late sprays for the 
control of the second brood of "worms," averaged only 3.2. 
The close interrelation between curculio injury and brown-rot 
infection is indicated in Table 4. Plat III was found to have a 
curculio infestation of 17 per cent and a brown-rot infection of 4.9 
per cent. Plats I, II, IV, and V, the several curculio infestations of 
which average 3.2 per cent, have an average of brown-rot infections 
of only 0.9 per cent. 
As in 1921, the spray was superior to the dust for the control of 
curculio. Apparently there was also a somewhat better control of 
brown rot from the use of the spray than from dusting, although the 
differences between the two methods of brown-rot control are not 
great and are probably to be attributed to a greater curculio infesta- 
tion in the dusted plat. In Plat VI, the dusted plat, 11.3 per cent 
of the fruit was infested with curculio and 5.2 per cent was infected 
with brown rot, as compared with a curculio infestation of 1.8 per 
cent and a browm-rot infection of 1.1 per cent in Plat I (Table 4), the 
plat which received the sprays at the same time that Plat VI received 
the dust applications. 
The addition of calcium caseinate to the sprays (Plat II) to increase 
their sticking and spreading qualities did not appreciably increase the 
