New York Agricultural Experiment Station. 401 



The following chart shows the size and arrangement of the different 

 plats and methods of treatment. 



6 rods wide 



6 rods wide 



6 rods wide 



Once sprayed 



Homemade 

 Fish-oil Soap 



1 lb. to 5 gal. water 



Twice sprayed 



BlacK Leaf 40 



1 gel to 200 qal. water 



Twice sprayed 



Orjce sprayed 



Tie sin Potash Soap 

 Twice sprayed 



Insecticide Soop 



1 lb. to 3/3 gal. water 

 Twice sprayed 



Once sprayed 



1 lb. to 3 V3 gal. water 

 Once sprayed 



Chart 2. 

 (Parallel lines, except those at right, indicate ditches.) 



Results. — One hour after spraying, a rough estimate of the effects of 

 the different treatments was made, which was based on the number of 

 insects moving as compared with those dead on the ground. In 

 general, where the vines were thin and scattered, the soap solutions 

 killed the majority of the nymphs, but on the heavy vines the appli- 

 cations were quite ineffective. The estimated percentages of insects 

 destroyed by the different mixtures are as follows: By two applica- 

 tions of insecticide soap, resin-potash soap and homemade fish- 

 oil soap, 70 per ct. of the insects were killed, and by one application 

 20 per ct.; by two applications of " Black Leaf 40 " 1 per ct. were 

 killed, and by one application, none were killed. 



Since there was no apparent injury to vine or fruit from the treat- 

 ment of July 11, and as there was still some soap stock on hand 

 and the insects were very numerous, it was thought best to make a 

 third series of tests. Accordingly, on July 15 all that portion of 

 the bog sprayed July 11 was resprayed as follows: 

 26 



