April,’24] snapp: paradichlorobenzene and peach borer 257 
years, more or less flecking of the bark layers or cambium injury from 
the use of the and ounce dose. 
Effects from Allowing Paradichlorobenzene to Remain 
Around the Trees All Winter 
Each year a hundred, or more, trees five years of age, or older, 
were treated with one ounce doses of paradichlorobenzene in the fall 
and the mounds left up around the trees over winter to note the 
effects from allowing the crystals to remain around the older trees all 
winter. 
Examination of these trees made during the spring and again in 
July of 1922 and 1923 showed no tree or trunk injury from allowing the 
mounds to remain around the trees over winter. Some injury may be 
revealed during the spring or summer of 1924 from allowing the mounds 
to remain around the trees in Georgia during the present winter, on 
account of the abnormal weather conditions that occurred there last fall. 
Results from Late Fall, Early Winter, 
and Spring Applications 
The effectiveness of late fall, early winter, and spring applications of 
paradichlorobenzene was tested on trees five years of age, or older, in 
another series of experiments. A different group of trees was treated 
with the one ounce dose every other week from the middle of October 
until the middle of December, and examinations for effectiveness made 
during the following May. To determine the effectiveness of the spring 
applications a number of trees was treated with the one ounce dose about 
April 1st and examined for borer control during the middle of May. 
These experiments showed that the applications made during the 
latter part of October and during November in Georgia gave a control 
of around seventy-five per cent. December applications in Georgia 
were worthless as no borer mortality resulted from the applications 
placed during that month on account of the low soil temperature. 
Paradichlorobenzene applied to trees in the spring around April 1st in 
Georgia resulted in about a seventy per cent control. 
Paradichlorobenzene for peach borer control gives the best results 
when used at the close of the oviposition period of the adult. Life 
history studied of the peach borer in Middle Georgia show that maximum 
emergence of adult moths takes place in middle September and the last 
of them are on wing during the latter part of that month. Allowing 
five days for the oviposition period of the last females, and a maximum 
