﻿OF THE STATE ENTOMOLOGIST. 



21 



they can be, and such destruction in dealing with the Spring species 

 will be facilitated by a bandage of rags below the trap or by anything 

 that will afford the moth shelter for her eggs and that can be easily 

 removed and scalded: where no such lure is used, an application of 

 kerosene will prevent the eggs laid on the tree from hatching. But some 

 are likely to be laid where they escape the closest scrutiny, and while 

 the precautions I have indicated will insure against the ascent of 

 such, whether from the Fall or Spring species; without those precau- 

 tions some of the newly hatched worms which can pass through a 

 very minute crevice or over the smoothest surface, may get into the 

 tree ; and though they may be so few in numbers as to attract no at- 

 tention they nevertheless perpetuate the species in the orchard. The 

 second contrivance is an old one that has been employed for nearly 

 forty years in Massachusetts, and lately used with satisfaction by Mr. 

 J. G. Barker of Cambridge. 



Fig. 14 is a section of the wliole contrivance— a a being the zinc roof over the oil 



troughs, i6; dd, the surface of the earth , cc^ 

 the tar or lime which is used to fill the box 

 around the tree. 



Fig. 15 is a smaller view of the same. The 

 box is square — large enough to leave about four 

 inches of space around the tree; is sunk some 

 four inches in the ground, and rises about ten 

 inches above the surface. The trough is in shape 

 liive the letter V, two inches deep, and is made 

 by a tinman before nailing on the box; it is 

 tacked on two inches below the upper edge of the box, and then the roof is placed in 

 position and secured by a single screw into the upper edge of each side or board. It 

 anust, of course, be placed in a level position, to hold the oil. This is done by means 

 of a spade used in setting the box in the earth. The box 

 and roof are nearly completed in the tinshop, but the cor- 

 ner of both must be left open till placed around the tree, 

 when the parts are soldered together. The roof is about 

 four and a half inches wide, with the underside turned un- 

 der about the fourth of an inch, to keep it stiflFand in shape. 

 In order to examine the oil, and to see that all is right, it is 

 necessary to loosen one of the screws. The box will vary 

 somewhat in size with the magnitude of the tree ; with a 

 trunk six inches in diameter, the box should be about four- 

 teen inches square and fourteen inches high ; for a trunk a 

 foot in diameter, it should be about twenty inches square ; 

 but a variation of two or three inches would not be of great importance. A few inches 

 of tanbark or lime placed within, is for the purpose of preventing the moths from 

 ascending inside. One pint of crude petroleum (costing 3 cents per tree, at 24 cents 

 per gallon,) is enough for each tree. 



Canker-worm Trap— Sec tioii . 



Caukcr-worm Traji 



