OF THE FAEM AITI) GABBEH. 



167 



weets haye attained their full size — about an inch in 

 length, when they cease eating, and let themselyes down 

 by a silken thread and enter the ground, where they soon 

 become chrysalids, in which state they remain all through 

 the summer and fall, and usually until the following spring, 

 when they emerge as moths. The fact that the female 

 moth is wingless makes it a comparatiyely easy matter 

 to keep these Canker-worms in check, for the parent 

 moth is obliged to crawl np the trunk of the tree to 

 deposit her eggs, and if she can be prevented from doing 

 this, of course she must lay her eggs below the obstruc- 

 tion, where they can be easily destroyed. 



Dr. William Le Baron giyes the following remedies 

 in his Second Illinois Eeport: 



^^Ist. Prevent the passage of the moths up the trees. 

 The most approved plan heretofore used is 

 to put a canvas or other cloth band, six 

 inches or more in width, around the trunk 

 and besmear it with tar, or a mixture of 

 tar and molasses, applied every other day. 

 The method suggested in this Report is 

 to put a band of rope or closely twisted hay ker-worm— 

 around the trunk, and over this a tin band 

 about four inches wide, so placed that the rope shall be 

 at the middle of the tin, making a closed cavity below, 

 and a free edge of tin above. The time to use these 

 appliances is mostly in the month of March, but also at 

 other times when the weather is sufficiently open to 

 permit the insects to run. 



" 2nd. If the moths are prevented from ascending the 

 tree, they will deposit their eggs below the obstruction, 

 and for the most part near to it. These eggs can be 

 destroyed by a single application of kerosene oil. 



3rd. If the moths are not prevented from ascending 

 the tree, they will deposit their eggs mostly upon the 

 underside of the scales of bark, on the upper part of 



