88 



THE GYPSY MOTH APPENDIX. 



Outdoor Experiments,* etc. Concluded. 



NO. OF DAYS. 



Di- 



Plumbic 



Arsenale, 



20-150. 



Tri- 



I'lumbic 



Areenate, 



20-150. 



CHECKS. 



No. 1. 



No. 2. 



No. 



1, 



2 



3 



4 



5 I 1 



6 1 



7 1 



8 . 1 



9, ... .1 



10, 



11 5 



12, 5 



13 5 



14 5 



15 5 



16 5 



IT 



IS 



19. 



20 



21 



_i 



_2 



3 

 3 

 3 



3 = 

 4 

 4 



4 

 4 



4 = 

 4 



4 

 4 

 4 1 



1 



3 = 



32 



3 



3 



3 



3 



4 



* Foliage uninjured. 



DI-PLUMBIC ARSENATE. 



Field Experiments. 



Twenty pounds to 150 gallons ; glucose, 1 gallon to 150 ; 

 red oak and white oak brush ; badly infested ; larva 3 in fifth 



and sixth stages. 



Pierce Street, Maiden. 



Sprayed June 25, 1897 

 June 29. Killing well. 



July 1. Killing- well. Stripping of foliage has stopped. 

 July 3. Killing well. Eighty per cent, of the larvre are dead 

 July 10. Killing well. Many larvre pupating 

 July 15. Poison nearly through killing, because of pupation of larva). 



Has given excellent results ; no burning of foliage. 

 July 21. Few dead larvte ; no burning. Poison has killed as well or a 



little better than the tri-plurnbic arsenate. 



