;hade-tree, is suffering from the ra^ 

 ous enemy, and dying one by one 

 and known to but a few. This is 



the larvae or grubs of which work 



When the grubs are numerous, their broad, flat burrows so 

 reticulate and run into one another as to effectually girdle 

 trunks of two to three feet in diameter, when, with the circu- 

 lation arrested, 'the death of the tree inevitably follows. 



No effective remedy against this attack has as yet been found, 

 u is probable, however, that where it has not proceeded too 



thick repellant^uLtanceToT whic? carbolic acid and Paris 

 green should be components), that would repel egg-deposit 

 or prevent the passage through it of the newly-hatched larva. 

 This coating would not need to be applied to the entire trunk, 

 but might be limited to a broad zone of several feet, at and 

 beyond that part where the burrows of the preceding year 

 were mainly run— to be found by removing portions of the 

 bark which will readily scale off from the deserted older 

 mfested portions. 



A still better remedy, I think, would be the following : 

 Kemove the outer bark from the entire infested portion of the 

 tree m the spring (occupied at the time by the larvae or the 

 pupae) by shaving it down to the inner bark until the first 

 indications of the fresh burrows are disclosed. A kerosene 

 wnulsion of good strength brushed over the shaven surface 

 would kill the insects, after which a coating of some thick 

 substance, as lime and cow-dung, should be applied to prevent 

 \vin<J Plitting ° f sap " wood from ex P osure to the sun ' dr >' in g 

 ven a greater extent than the 



3 detlSed in°The eX ^ri/Tw"? 

 '^cultural Gazrttr for April 29, 1848, and 

 3 ackard in his recent report on "Insects In- 

 t and Shade Trees," as follows : 



