INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 



483 



Size. — The size of a tent naturally depends upon the size of the 

 tree. For young orchards a twenty-foot tent will serve until the 

 trees are about four years old and the tents can then be enlarged 

 by simply sewing a border around the edges. This border is usually 

 made of lighter 6-ounee drilling, in this way an orchard may be 



Fig 4S2 — Showing shnpe and Morrill method of marking a fumigating: tent. 

 (After U. s. Dept. Agric.) 



carried over until the ordinary larger tents can be used. In fact, 

 many fumigators do use a large tent upon a small tree by placing 

 a suitable square or triangular frame around the tree to support the 

 tent or, if the trees are strong enough, to allow them to support the 

 tents unaided. 



For ordinary work 45-foot tents are commonly used and meei .ill 

 requirements of a full-grown orchard, except for unusually large 

 trees, many of which require 70 or 80-foot tents. It is customary, 

 however, to use two or even three ordinary tents together when there 

 is only an occasional large tree. 



Materials.— The life and nature of a fumigation out lit depends upon 

 the qualitv and care of the tents. Many materials have been recom- 

 mended and tried; army duck and drills of various weights being 

 those most used. A special tight-woven drill tent was once recom. 



