12 Farmers’ Bulletin 1246. 
conditions best for the application of ‘paradichlor” and the following 
dates tentatively decided upon as best on the average for the respec- © 
tive regions: 
Michigan,’Ohio, Connecticut... .-caiacstescee. oe... 2 se September 1. 
New Jersey, West Virginia, Maryland.................... September 10. 
North Carolina and the Ozarks. .:.....2.-.-2...020s0.622 September 25. 
Georgia and \ Texts co J 02). 5.20 emer eae oe od ts be October 10. 
There are, however, limited seasonal variations in time of cessation 
of egg laying by moths in the fall. If applications of ‘“‘paradichlor” 
: are made as indicated, any 
belated young larve as 
they hatch will be killed 
for the most. part during 
the continuance of the 
chemical around the 
trees—a period of several 
weeks—and beyond this 
time not much, if any, in- 
festation will occur. — 
PREPARING THE TREES. 
The earth for 15 or 18 
inches around the base of 
trees should be cleaned of 
grass and weeds and ley- 
eled off, without, however, 
digging up the soil any 
more than necessary to 
break the surface crust 
(ig: 11)--—-It boretssare 
present in the trunk of the 
Fria. 11.—Preparation of ground previous to applying para- trees somewhat above the 
dichlorobenzene and method of application of the chem- ground level, as indicated 
ae by the presence of gum or 
frass, a few shovelfuls of earth should be thrown around the tree and 
leveled off to form a bed for the application of the “ paradichlor”’ high 
enough to subject the infested trunk to the fumes of the gas. Asa 
rule the raising of the soil level around the tree will be unnecessary 
and is undesirable as favoring the washing down of the mounds by 
rain and interfering with the effectiveness of the treatment. If there 
is a decided mound of earth around the collar of the tree, this should 
be scraped down level with the surrounding soil. Excessive gum 
and frass should be removed and the bark lightly scraped. Exposed 
roots should be covered with a light layer of soil, since these are less 
resistant to gas fumes than the bark of the trees. 
