42 FARMERS BULLETIN 860. 



Carbon disulphid injected into the .soil was found nnsadsfactory 

 and very expensive in an effort made to kill the larvje. 



WHITE GRUBS.' 



The large root-feeding white grubs are found occasionally in 

 cranberry bogs, but rarely are of nuich importance. The specific 

 injury results from the feeding of the grubs on the fine roots of the 

 vines, these being cut off completely, so that the vines with a thin layer 

 of turf may be easily lifted and rolled back like a rug. The grubs 

 then will be found at the surface or very near the surface of the 

 exposed ground. 



Fall reflowing for a period of 10 days, from October 25 to Novem- 

 ber 4, did not kill grubs in the soil, and they hibernate with safety 

 on winter-flowed bogs. For small infestations of a feAV square rods, 

 it seems best to " turf off " the infested area, which will be defined 

 closely by the dead vines, and to reset with new vines. 



Should a large area be infested and the destruction of the bog be 

 threatened, it is probable that holding the winter flowage until July 

 15 would rid the bog of grul)s. 



iParticulnrly I'Jiiitiihis iiforylaniis Horn., Djisvinciux tnich.upHliii-^ I'.uini. ;in(l LacJiiio>^- 

 teiiiii (//((////iv'Siu. 



