61 



I Chrysalis in the ground. 



Fignre 47. 



MAY BKICTLE. 



2. larva feeding. 



3 and 4. beetles. 



lessen the number of white grubs, which is the form shown as 2 

 figure 4G. Where the white grub is abundant in the ground it is 

 often very difficult to reach it by any remedies, so much so that 

 some of our best entomologists have recommended starvation bv 

 leaving the land untilled for one or two seasons. In the last Re- 

 port of the Experiment Station a new remedy has been recom- 

 mended which, I have strong hope, will prove efficacious and not 

 very costly, although further experiments are needed to determine 

 just the best method of application. This remedy is bisulphide of 

 carbon, a liquid in some respects like benzine or gasoline, in that 

 it readily vaporizes, and the vapor is destructive to insects. It is 

 very evil smelling and very inflammable, so that those using it need 

 to keep continually in mind the fact that no spark of fire can be al- 

 lowed to come in contact with the vapor, if it does, explosion and in- 

 jury is likely to follow. In using it, holes should be made in the 

 ground with a small bar of wood or iron, a teaspoonful or two of the 

 fluid poiu'ed in, theopeningstopped with a lump of clay or anvthing 

 of the sort. The volatile nature of the bisulphide causes it to 

 change rapidly from fluid to vapor and penetrate the surrounding 

 earth and destroy such insects, white grubs, wire worms etc., as 

 may be within reach. Just how far apart and how deep the holes 

 should be, must depend upon the nature of tiie soil and other local 

 conditions, and must be determined by experiments in difierent 



