To —s ee, 
The Peach Borer. it 
favorable conditions. The vapor, while harmless to persons and 
domestic animals under ordinary conditions, is poisonous to insects 
confined in its fumes for a sufficient length of time. Its vapor is 
heavier than air and readily permeates the soil. The chemical is, 
for practical purposes, noninflammable, and the fact that it is a finely 
divided solid adds much to the ease with which it may be applied. 
As usually sold it is a little too coarse for rapid volatilization, and 
orchardists in purchasing it should specify that they be furnished 
with a grade of the fineness of granulated sugar or coarse salt. Only 
the pure article should be purchased. Should there be some loss 
by evaporation in the containers the remainder of the chemical is 
Fic. 10.—Peach tree to which a wash has been applied and earth 
mounded around the base. 
always 100 per cent pure. If mixed with some inert material, the 
loss by evaporation of the “paradichlor”’ will result in a weakened 
mixture difficult to employ at a known strength. 
WHEN TO APPLY IT. 
The application of “‘paradichlor’”’ to peach trees for the control 
of the peach borer should be made in the fall, after most of the moths 
have oviposited, to avoid late infestation of the trees. At this time 
many of the larve are still small and more or less exposed, and hence 
moresusceptible to the gas than if deep in their burrows on the crown 
androots. Applications must not be delayed, however, until the soil 
temperature is so low that proper volatilization of the chemical will 
notresult. Many studies have been made as to the soil temperature 
