14 
BULLETIN 1205, IT. S. DEPARTMENT OF AC. PJ CULTURE. 
Table 11 gives the summary of results of the field experiments 
in 1 1)22. 
Table 1 1. — Summary of results from post-harvest spraying and dusting, (922. 
Beetles per tree. 
Period. 
Platl 
(check). 
Plat 2 
(sprayed 
once). 
Plal 3 
(sprayed 
twice). 
Plal ! 
(dusted 
I wire). 
0.28 
. 36 
0.G6 
. 319 
0. 13 
. 11 
50 
22 
i.07 
.27 
.02 
.28 
Per cent. 
i 25 
Per cent. 
40.91 
/Vr cent. 
16.38 
Ptr cent. 
56 
» Increase. 
The data given in Table 11 substantiate the results of the post- 
harvest experiments of former years in that the number of beetles 
increased on the check plat and decreased on the sprayed and dusted 
plats. Post-harvest spraying or dusting would hardly have been 
an economical practice for the commercial peach grower in 1922, 
because the curculio infestation was light. Post-harvest treatments, 
however, would be of material value in case of a heavy infestation of 
the curculio, such as occurred in Georgia during the three previous 
years, 1919 to 1921, inclusive. 
RESULTS OF INSECTARY WORK IN 1922. 
The same type of insectary work in conjunction with the post- 
harvest field experiments was conducted in 1922 as in 1921. Thirty- 
six jars were used, with 10 beetles confined in each jar. These 
beetles were taken from the daily collections from the several plats 
between August 9 and September 1 for mortality records. Ten jars 
each were used for plats 1, 2, and 4, but only six for plat 3, owing 
to the fact that after the second spraying not enough beetles were 
collected from this plat for insectary tests. 
Table 12 gives the record of daily mortality of the beetles collected 
from the four plats. 
