THE TENT CATERPILLAR 



rated with kerosene are also used, as well as various 



other devices. But burning is a remedy which is 



likely to cause more harm than good. It may not 



injure the tree much, but one is always tempted to 



use it on the larger branches where the bark is 



very likely to be seriously damaged. I have seen 



a fine young apple tree killed by the use of a 



torch on its tent caterpillars, and have known 



many larger trees to be seriously injured in the 



same way. 



4. Spraying with the Arsenites. — On 

 many accounts there is no more satisfactory 

 method of subduing the tent caterpillar in 

 the orchard than by spraying with Paris 

 green or London purple mixed with water. 

 Not only is this pretty certain to kill off all 

 the young caterpillars on the trees, but it also 

 destroys canker worms and also other leaf- 

 eating caterpillars as well as the larvee of the 

 Codling Moth or Apple Worm, discussed 

 in Bulletin 35 of this Station. 



Fortunately spraying has been adopted 

 by a great many commercial fruit-growers 

 as an essential part of the season's opera- 

 tions, and the practice is growing in 

 favor yearly. Four or five ounces of 

 Paris green, with a pint or two of 

 fresh lime water, are added to a bar- 

 rel holding forty or fifty gallons of 

 water, thoroughly mixed and sprayed 

 upon the trees soon after the worms 

 hatch, by means of a force 

 pump and spray nozzle. A 

 simple and effective spray- 

 ing outfit, which has been 

 used to good advantage in 

 the experiments at this Sta- 

 tion, is represented in Fig. 



