INSECTS INJURIOUS TO AaEIGULTUER 203 



States, as well as Canada, New Brunswick, and Nova 

 Scotia. 



REMEDIES. The universal remedy is Paris green, one part mixed 

 with about twenty parts of cheap flour, and dusted with a dredging- 

 box over the vines early in the morning while the dew is on the ground. 

 As the dry powder blows about, and is a poison, Paris green being a 



FIG. 245. Colorado potato-beetle, n, e^g<; b, b, b, larva; c, pupa; d, beetle. 



preparation of arsenic, it is better to apply, with a spraying-machine 

 or watering-pot, a liquid preparation, i.e., a mixture of Paris green 

 and water. On small farms and in gardens near the dwelling-house 

 Paris green should be used with caution, as it has been known to 

 poison cows and horses. 



Blistering-beetles (Macrolasis cinerea Fabr., Epicauta 

 pensylvanica De Geer, etc.). These insects do more or less 

 damage to potato- leaves in certain years. The black blister- 

 ing-beetle (E. pensylvanica^) is commonest northward; it is 

 totally black, and is a little smaller than the gray species 

 (M. cinerea}, which is ash-colored on the head, the pro- 

 thorax, and under side of the body. The striped blistering- 

 beetle (E. vittata) is longer and slenderer than the others 

 named, and is clay-yellow, with six black longitudinal 

 stripes. The remedies recommended for the Colorado 

 beetle will destroy these and all other insects feeding on 

 potato-leaves. 



