334 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE II 



EXTENSIVE AREAS DEVOTED TO A SINGLE SPECIES FREQUENTLY 

 PEOVE UNSATISFACTORY 



Carolina poplar, Cincinnati, Ohio, killed by the poplar borer (Saperda 

 calcarata). This picture illustrates the inadvisability of planting large areas 

 to a single species. The borer gained a foothold in this planting and prac- 

 tically every tree was killed by it. Pure plantings in many cases invite insect 

 disasters and in the event the planting is destroyed, the loss is keenly felt. 

 Mixed plantings are less likely to suffer complete destruction by a single 

 invader. 



