6 



ALFRED E. CAMERON. 



was the same in all three, namely 5-5-50, and to every 100 gallons of the mixture 

 six pounds of arsenate of lead were added as a poison for the Colorado potato beetle 

 {Leptinotarsa decemlineata) and the flea-beetle (Epitrix cucumeris). This poison 

 served to control the ravages of these pests at Elmer and Freehold, but at Robbins- 

 ville zinc arsenite was tried, with what results will be hereafter set forth in the section 

 on flea-beetle control. 



In the case of the proprietary Bordeaux preparations, Ansbacher's* was applied 

 at the rate of 20 pounds per 100 gallons, which sufficed to cover just about two acres. 

 Vreeland's Electro Bordo-Leadf was applied at the rate of about 18 pounds per acre 

 dissolved in 100 gallons, an intentionally, rather heavy application ; while 13 pounds 

 of Kil-Tone, J of which 18 pounds were dissolved in 100 gallons, served to treat one 

 acre at Elmer. 



It was so arranged that an interval of 8 to 12 days should elapse between each treat- 

 ment, this being considered the outside limit for safety, since the new shoots which 

 are springing up run serious risk of damage both from insect destroyers and fungus 

 parasites if a longer period is allowed to intervene between the applications. Assiduous 

 attention to spraying and thoroughness of application are important factors for good 

 results, and it has been shown by the experiments of the New York Agricultural 

 Experiment Station § that the more sprayings one makes the greater are likely to be 

 the yields, and therefore the profits. In New Jersey, the potato foliage begins to 

 overlap in the rows about the end of June, making it difficult for the operator to 

 drive a team into the field without injuring the plants. It is quite possible to have 

 made four applications previous to this, but the foliage continues to grow for a month 

 later. In cases where circumstances are favourable to the appearance of the late 

 blight, it would be absolutely essential to make at least two further treatments before 

 the foliage dies. 



* Analysis of Ansbacher's Bordeaux-Lead : — 

 Moisture . . 

 Copper Hydrate (Cu (OH),) . . 



Lead Oxide (Pb 0) 



Total Arsenic Oxide (As, Or,) . . 

 Inert ingredients by difference 



After drying. 

 Copper Hydrate (Cu (OH),) . . 



Lead Oxide (Pb 0) 



Total Arsenic Oxide (As, OJ . . 



Inert ingredients . . 



Arsenic Acid soluble in water . . 



t Analysis of Vreeland's Electro Bordo-Lead : — 



Dry Lead Arsenate 



Copper . . 



Inert ingredients 



Water soluble arsenic, expressed as metallic 

 I Figures for Kil-Tone are not available. 

 §Bull. 323, N.Y. Agric. Exper. Sta., Geneva, 1910, p. 323 







42% 







6-36% 







20-51% 

 9-19% 







5-91% 



15-16<%, 

 48-85% 

 21-90% 

 14-09% 







trace. 





.. 27-00- 



-33-00% 



, , 



. . 1-65- 



- 2-00% 



. , 



.. 64-67- 



-71-08% 





.. -107- 



— • 1 1 7 O'' 



