234 FUMIGATION METHODS 
allowed to be covered. He has found no instance, as 
yet, of living scale on any such treated stock. 
Orchard fumigation.—One of Canada’s fruit grow- 
ers writes Professor Lochhead regarding the application 
of the tent system of fumigation on small orchard trees 
as follows: ‘‘ We took a common apple barrel, mak- 
ing it fit the trees by using a width of ten-cent factory 
cotton well soaked in linseed oil, and while wet tacked 
it on the barrel. When dry it seemed to adhere to 
the barrel, making it practically air-tight. Then I 
headed back the three-year-old plum trees, so as to 
drop the sacks over them. For large trees we made 
tents 6x 7x9 feet high, with posts at each end and 
sills and plates, these being well braced both horizon- 
tally and perpendicularly. Then I made a door, 
fastened to one post by three hinges, and shut to next 
post by a bolt in center and buttons at the top and 
bottom. I measured out factory cotton twenty-six 
inches long and sewed three widths together. This 
was oiled and tacked on while wet. We put on 
top piece first with tacks, then commenced side cover- 
ings where the door shuts, and brought it right around 
the frame, letting it lap two inches on top and leave a 
balance of ten inches to lay on ground, which is cov- 
ered with earth. Then a common lath is nailed over 
the lap all around the top. When complete cut out 
the hole on the side the door hinges on, to allow the 
tent to pass over the tree. This will require three 
days to dry properly. ‘Trees treated with the last tent 
were eight years old and had borne four crops of fruit. 
We had to head them back considerably. It takes 
three men to handle these large tents, but one man 
