MONTANA EXPERIMENT STATION. 



157 



found the fungus disease and the beetle at identical spols on apple 

 trees may be explained by the germinating spores of the fungus 

 disease finding in the punctures into the bark made by the beetles 

 in depositing their eggs, suitable places for gaining access to the 

 under layers of the bark. If this be the case then the weevil is 

 the primary cause and the fungus secondary. 



Considering what information we now have regarding this borer, 

 it is apparent that in the interests of the apple growers it will be well 

 to watch for it and become familiar with its habits. 



The beetle is small, black, and has a snout. See the accompany- 

 ing figures. 



Fig. 6. Work of the apple tree borer; — a, pupa in its cell;, b, exterior of 

 pupal cell; c, empty cell; d, parasitic pupa in its cell; e, two empty cells of 

 parasite; f, beetle and holes made by beetles in their escape — all natural 

 size. (Chittenden, Bulletin 22, New Series, Div. of Entomology, U. S. DepL 

 of Agr., 1900). 



