34 



Infested corn fields may be sprayed early in Ihe season with 

 Paris green,* one pound to two hundred gallons of water, and, if 

 properly done, without danger to stock feeding on the stover. 

 "Where the army worm is particularly abundant it may be advisable, 

 in order to prevent migration, to spray grass land or to burn over 



the fields at once. For 

 this latter purpose the 

 "Cyclone burner" 

 (Fig. 6), originally 

 designed for burning 

 brush laud infested by 

 the gypsy moth, will 

 be found of value. It 

 may be made by mount- 

 ing a small force pump 

 on a ten or fifteen gal- 

 lon tank, and connect- 

 ing the pump by means 

 of a short piece of oil hose with a one-half inch iron pipe at the 

 end of which a cyclone nozzle may be attached. The pipe should 

 be about ten feet in length and have a wooden casing for con- 

 venience in handling. The tank should be filled with cheap crude 

 oil. The oil is forced out at the nozzle, and by igniting the spray 

 at the nozzle a flame results, which destroys every living thing 

 with which it comes in contact. The cyclone burner may also be 

 used to good advantage for destroying the worms collecting in the 

 furrows. 



On cranberry bogs Mr. Lounsbury f recommends wide water- 

 filled ditches as the best means of checking the spread of the 

 insect. 



Natural Enemies. 



Among the natural enemies of the army worm, birds are entitled 

 to chief recognition. It is a well-known fact that smooth-skinned 

 larvae form a favorite article of the diet of insectivorous birds, and 



Fig. 6. 



* Arsenate of Lead or Arsenate of Barium, three pounds to one hundred and fifty 

 gallons of water, may be substituted for Paris green. Arsenate of Barium is a 

 promising new insecticide, which has been used experimentally with good results 

 against the gypsy moth during the past summer. Its use as an insecticide was 

 first suggested by the writer during the winter of 1895-96 as a result of investigations 

 upon the different arsenates, and it has so far proved superior to any of the arsenical 

 compounds now In use. Further experimentation, however, and, more particularly, 

 the practical use of the poison on a large scale in the field will be necessarj' to accu- 

 rately determine its value. 



t Bulletin 28, Hatch Experiment Station, 1895. 



