CONTROL FOR WHITE GRUBS. 



Fig. 1. — Sketch of the Greenhills Estate. 



Arrows indicate direction of prevailing winds. Shaded areas regularly injured 

 by grubs. White immune. Stippling indicates additional areas injured, 

 following abnormal flight of the beetles in 1920. 

 + + Feeding trees of the beetles. 

 = = Roads and headlands. 



X Muscardine fimgus destroying grubs. 

 B Bacterial disease destroying grubs. 

 O None of the grubs diseased. 



