October, '19] 



WOGLUM: DOSAGE SCHEDULE 



361 



A New Dosage Schedule 



The necessity of a special schedule for use with liquid hydrocyanic 

 acid is at once apparent by an examination of the complete results in 

 Tables I and II, which compare liquid hydrocyanic acid and pot- 

 generated gas. Such a schedule has been prepared and is herewith 

 presented. It is the product of nine months continuous field experi- 

 ment and observation during which records were kept on several 

 hundred acres of fumigated trees for the black, purple and red scales. 



Dosage Schedule for Citrus-Tree Fumigation with Liquid Hydrocyanic Acid 95-98 Per Cent 



Distance around in feet 



Unit clmrge=lS cubic centimeters 



In being based on the results of field practice rather than being a lab- 

 oratory calculated schedule prepared in accordance with tiicories of 

 leakage, size, shape, etc., it is to be expected that the dosage will not 

 in every case be found to conform perfectly with mathematical cal- 

 culations as based on such theories. However, it is believed that in 

 its present form this schedule has been so carefully prepared that it 

 will approximate uniform results in orchard treatment regardless of 

 the size of the tree and prove fully as satisfactory as the original sched- 

 ule prepared for pot-fumigation. 



