CORN PESTS AND DISEASES 259 



these insects searching for places suitable for the 

 support of the young. Professor Forbes says direct 

 remedies for the attacks of white grubs are either inap- 

 plicable to the corn field, are of doubtful economic 

 value, or are too little understood, as yet, to make them 

 worthy of recommendation. For example, kerosene 

 emulsion may properly be applied to infested lawns, 

 and, if followed by a copious watering, may kill large 

 numbers of the grubs, but the cost of the material and 

 treatment will preclude its use against grubs in com ; 



Fie 65-Pale Striped Flea Beetle 



(After Chittenden) 



and kainit and other potash fertilizers will destroy 

 grubs in the earth, but for this purpose must be used at 

 a rate inadmissible in farm practice. 



The southern corn root worm will probably be 

 found much more generally present in corn fields than 

 indicated by reports. Its injuries are very similar in 

 general character and effect to those of the much more 

 abundant and better known northern corn root worm, 

 mentioned below. The presence of this root worm in 

 the field gives origin to the usual general effects of the 

 loss of roots by the plant, varying according to the age 



