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 6x7x9 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 



