212 N. H. AGR. EXPERIMENT STATION. [Bulletin 139 



one pound to 100 irallons, with a pound or two of freshly slacked 

 stone lime is equally effective, but does not adhere as well. It is 

 useless to wait until the tree is covered with large Avebs and then 

 spray. To be effective the tree must be sprayed early in August 

 soon after the eggs hatch. As it is also advisable to spray at this 

 time for the young bro\\Ti-tail moth caterpillars, it will be found 

 to be good practice to spray about this time every year. 



Destroying the Pupae. — ^luch can be done to check the in- 

 crease of the web-worms, as well as of other insects, by destroying 

 the pupae in the winter. They may commonly be found in hol- 

 low trees, under bai-k, in fence corners, under rubbish, etc. In 

 many of these places they can be easily destroyed. We Jiave 

 found the holloAV trunk of an old tree containing a score or more, 

 when it might readily be cleaned out and filled with clay with 

 benefit to the tree itself. 



