400 Report of the Department of Entomology of the 



potash soap, 1 pound to 6 gallons of water, on plants that were in 

 full bloom, and other vines that were well infested with the 

 insects. 



Results on insects and plants. — As far as could be determined very 

 little if any of the spray reached the young nymphs and little or 

 no protection was afforded the vines. An examination on July 27 

 showed that the set of fruit had been reduced at least 75 per ct. 

 as the result of injury to the blossoms. 



Bog No. 2. — On this bog the following insecticides were tested : 

 Vreeland's insecticide soap, Good's resin potash soap, homemade 

 fish-oil soap 10 and "Black Leaf 40." The first application was made 

 July 9. The spraying plats were arranged as shown in Chart 1. 



canal 



to 



1 



o 

 ft, 



Fish-oil Soap 



1 to 7 

 1 bill, uoei 

 twice sprayed 



Insecticide Scop 



1 to 5 

 1 bbl. used 



Res in Potash Soap 

 1 to 5 

 1 bbl. used 



Black Leaf 40 



1 to 800 



lbbl. used 



B.L.40 



1 to 400 



1 bbl used 



3roc5s 



6 rods 



6 rods 



Chart 1. 



5 rods 



3 rods 



These materials were applied with a cluster of three " Mistry 

 Jr." nozzles at a pressure on pump of 180 lbs., the engine and pump 

 being mounted on a float in the canal. (Plate VII, fig. 2.) By exam- 

 ining the vines as fast as sprayed, it was found that many of the 

 nymphs had been disturbed and were working up towards the tops 

 of the vines. Hence, on the plat where homemade fish-oil soap was 

 used, a test of respraying was made as soon as it had been sprayed 

 over once. 



Results on insects. — Two hours after spraying, all the plats were 

 examined again, and no dead nymphs of the toad-bug were found 

 except where the double spraying with the fish-oil soap was 



given. 



On July 11, a second attempt was made to kill the cranberry toad- 

 bug by spraying. In this effort a different section of the bog was 

 used, which is devoted to the Centennial variety. As the bog is 

 laid with galvanized piping, for spraying all portions from the canal, 

 this equipment was used for the treatment of the experimental 

 plats. (Plate XVII, fig. 1.) 



10 N. Y. Agr. Exp. Sta. Bui. No. 257, p. 434. 



