22 



FUMIGATION FOR THE CITRUS WHITE FLY. 



MISCELLANEOUS REQUIREMENTS. 



According to the method of procedure hereinafter described and rec- 

 ommended for use in fumigating for the white fly, when an outfit of 

 more than four or five tents is in use, a cart or stone drag and a horse 

 may be desirable for carrying the materials from tree to tree. An 

 ordinary hand push-cart can be recommended as convenient for use 

 in some cases. Wlien a horse or a hand push-cart is not available, a 

 box-like tray (PI. IV, fig. 1) with handles should be constructed. 

 This should be large enough to contain a supply of acid and cyanid 

 for all of the trees covered at one time by the set of tents in use. One- 

 half of the tray should be reserved for as many 3-quart pitchers as 



may be needed and for the graduate, and the 

 other half should be provided with compart- 

 ments for the bags of cyanid, if weighing is 

 done by day, or an "open box for the loose 

 cyanid if the weigliing is done as each tree 

 is fumigated. A torch should be fixed over 

 the center of the tray, and if the cyanid is 

 weighed as used there should be a strip of 

 board across the tray to serve as a platform 

 for the balances. Balances are preferable to 

 spring scales for use in weighing the cyanid. 

 They should not be larger than necessary for 

 weighing 40 ounces of cyanid at once. For 

 containing the acid temporarily, stoneware 

 churns of a capacity of 3 or 4 gallons are 

 much used in California, and can be recom- 

 mended for use in Florida. Frequently sev- 

 eral 3-quart pitchers are more convenient than 

 the stoneware churns. A measuring glass of 

 16 ounces capacity is needed for measuring 

 the acid, and an extra measuring glass should 

 be provided for use in case of breakage. The 

 acid is dipped into the measuring glasses by 

 means of a long-handled enamel-ware dipper, or poured in from a 

 pitcher. For carrying water a couple of large pails are needed. 



The one who measures the acid and generates the gas should be 

 provided with rubber gloves of good quality and long enough to 

 cover the wrists well, or even the entire forearm. For generating the 

 gas, earthernware jars from U to 5 gallons capacity are necessary, 

 according to the size of the trees and dosage required. Extra jars 

 should be provided to obviate possible inconvenience in case of break- 

 age. Cylindrical jars are preferable to those which narrow at the top, 

 as the chemicals are much more likely to boil over in the latter than in 

 the former. The cyanid, after being weighed, may be put into paper 



Fig. 3.^Plan for schedule board, 

 showing convenient arrange- 

 ment: ^, space for resting lan- 

 tern temporarily; B, scratch 

 pad; C, dosage table; D, dia- 

 gram of grove. (Original.) 



