24 



FUMIGATION FOR THE CITRUS WHITE FLY. 



N. 



W. 5 



5. 



hand corner, while the space (fig. 3, A) in the upper left-hand comer 

 is left for the fiimigator to set his lantern while he is writing down on 

 the diagram the dimensions of the tented tree and the amount of 

 dosage. It will be found convenient to attach a pencil to this board 

 with a short string. 



The diagrams of the grove are prepared as shown in figures 4 and 5, 

 representing a small grove set in regular and alternate rows respec- 

 tively. When set with any form of regularity the individual trees 

 may be conveniently referred to by numbering the rows in one direc- 

 tion and lettering 

 them in the other. 

 Thus the first tree of 

 row No. 1 is called 

 lA, the second IB, 

 etc., while in the 

 other direction the 

 trees are referred to 

 as 2A, .3A, etc. In 

 measuring the cir- 

 cumference of the 

 trees or in checking 

 the correctness of 

 the estimates based 

 on pacing, a 75 or 

 100 foot tape at- 

 tached to a reel is 

 needed. Water- 

 tight barrels are re- 

 ({uired for contain- 

 ing the stock of wa- 

 ter for use during 

 the night. 



When weighing 

 the cyanid a tin 

 scoop is sometimes useful, and leather gloves should be jjrovided 

 for the one who does the weighing. Wlien weighing of the cyanid 

 is to be done during the day five wooden boxes, with hinged covers, 

 of a size that will conveniently fit into the cart, or one box with 

 six compartments, should be constructed for use in holding paper 

 bags of cyanid in doses of 1, 2, 5, 10, and 20 ounces, respectively. 

 Experience will show the number and style of lanterns and torches 

 required. A hammer, hatchet, and other incidentals can be procured 

 as found necessary. 



Fig. 



Diagram of grove with alternating trees; first four rows in 

 process of fumigation with four tents; three sets of trees fumigated, 

 the tents being moved from south to north: X, X, X, trees missing. 

 (Original.) 



