CALIFORNIA CITRUS CULTURE. 79 



METHODS OF PROCEDURE. 



For an outfit of thirty or thirty-five tents five men are required to 

 operate to an advantage. Two men pull the tents and kick in the edges 

 around the bottom. One man, the taper, takes the measurements of the 

 tree and calls them off to the man who weighs out the cyanide. After 

 determining the dosage this man also empties the generators from the 

 row just finished and has them ready for the next trees by the time the 

 chemical cart arrives. The man who weighs the cyanide determines the 

 dose on the schedule from the measurements called out by the man who 

 measures the tents. The cyanide man also lifts the tent so that the 

 last man who measures out the acid and water in the generators may 

 place them well under the tree, after which the cyanide is added. In 

 no case should the acid man touch the tents. "While the chemical men 

 are dosing one tree the taper is getting the measurements for the next 

 tree ready in advance. In brief, the procedure is as follows: putting 

 the tents over the trees, measuring and dosing. The string of thirty 

 tents can be easily dosed within forty-five minutes or an hour. Methods 

 of procedure vary considerably, the above being general. 



For extra large trees a special tent-hoisting apparatus (Fig. 53) 

 has been devised by Mr. C. E. McFadden, with which a 70 or 80-foot 

 tent can be easily and quickly put over the largest citrus trees. 



DOSAGE. 



The amount of cyanide used depends upon the pest to be treated. 

 Accordingly several schedules (Figs. 54, 55) have been made, based 

 upon dosage schedule No. 1 for purple or red scale made by E. S. 

 Woglum. This dosage consists of one and a half ounces of potassium 

 cyanide to every one hundred cubic feet of air space. The schedule 

 dosage for black scale usually consists of three fourths of schedule 

 No. 1 and is designated dosage schedule No. f . 



If sodium cyanide is used the dosages are reduced 25 per cent. 



Black Scale. Either dosage schedule No. J or -J for potassium 

 cyanide or -J for sodium cyanide. The smaller dosage is recommended 

 only where there is an even hatch of very young scale insects. 



Purple, Red, Yellow Scale. Use dosage schedule No. 1 for potas- 

 sium cyanide and No. f for sodium cyanide. 



Mealy Bug. The same dosage as for black scale gives almost as 

 good results as the heavier doses. 



