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EXPERIMENTS WITH PARIS GREEN ON TENT 

 CATERPILLARS. 



Wishing to determine the smallest amount of Paris green that 

 would destroy one of our common insect pests, I selected the common 

 tent caterpillar {Clisiocampa americana Harr.) to experiment upon. 



One Pound of Paris Green to 100 Gallons of Water. 

 First Molt. 

 April 29, 1891, at 3 p.m. spra^^ed a branch of apple tree with Paris 

 green and water in the above proportions (1 lb. to 100 gals.), and 

 placed 15 young caterpillars upon the leaves. At 11-30 a. m. April 

 30, two were dead, at 1-30 p. m., four more had died, and at 9 a. m. 

 May 1, all were dead. 



Second Molt. 

 April 29, at 4 p. m. sprayed a similar branch with the same prepar- 

 ation, and placed 10 one-third grown caterpillars upon the leaves. 

 At 3-30 p. M., April 30, one was dead, at 9 a. m.. May 1, four more 

 had died, and at 3 p. m., all were dead. 



Third Molt. 

 April 30, at noon, sprayed as above, and placed 15 two-thirds 

 grown caterpillars on the leaves. All were dead at 8 a. m., May 1. 



Fourth Molt. 

 April 30, at noon, sprayed as above, and placed 15 full-grown 

 caterpillars on the leaves, and all were dead at 10 a. m.. May 1. 



One Pound Paris Green to 150 Gallons Water. 

 First Molt. 

 April 29, 1891, at 4 p. m., sprayed a branch of apple tree with Paris 

 green in water (1 lb. to 150 gals.), and placed 15 young caterpillars 

 upon it. At 8 A. M., April 30, several were dead; at 9-30, two 

 more were dead ; at 1-10 p. m., four more had died, and at 9 a. m., 

 May 1, all were dead. 



Second Molt. 

 April 30, at 9-30 a. m., sprayed in the same manner, and placed 

 15 caterpillars on the leaves. May 1, at 8 a. m., five were dead ; at 

 9-30, two more had died, and at 10 a. m. all were dead. 

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