. be t 2 
PARADICHLOROBENZENE ON YOUNG PEACH TREES. Tt 
Table 7 shows that the spring treatment of paradichlorobenzene in 
Georgia is not as effective for the control of the peach borer as the 
early fall treatment. ‘This is perhaps largely due to the size of the 
larve in the spring and the fact that many individuals are in deep 
galleries by that time. The larger the borers and the deeper they are 
in the gallery the more difficult it is to kill them with paradichloro- 
benzene gas. The 1922 Bees treatment gave a borer mortality of 
72.4 per cent. The early fall treatment gave from 95 to 100 per cent 
\ 
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GEE! S30 SHE 
4 
TEMPERATURE, F 
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Fie. 1—Monthly mean soil temperature 3 inches below the surface, at Fort Valley, Ga. (The heavy 
horizontal line indicates the lowest temperature for best results with paradichlorobenzene.) 
mortality; 17.2 per cent of the borers were active six weeks after the 
spring applications were made, and 10.4 per cent of them were 
stupefied. 
Spring applications of paradichlorobenzene will not give as satis- 
factory control of the peach borer as the early fall applications, and 
they can not take the place of the fall treatments. They should 
only be used where for an unavoidable reason the grower was not 
able to apply the material in the fall. Where conditions warrant 
these spring applieations, they should be applied by April 1 in Georgia 
and the Gulf States. For best results with paradichlorobenzene, it 
