CHAPTER XI 

 EQUIPMENT FOR FUMIGATING NURSERY STOCK 



T""!HK enclosure necessary for fumigating purposes 

 . in nurseries varies considerably. In some 

 cases boxes will accommodate the grower, 

 but the building is usually constructed in 

 accordance with the number of trees grown or handled. 

 Some nurserymen have found it necessary to construct 

 a house large enough to hold 12,000 to 15,000 first- 

 class trees at one time. Some firms handling a million 

 or more trees annually have rooms large enough to 

 admit a wagon-load of trees at one time, examples of 

 which are given in Figs. 52 and 64. 



A good tent, such as is seen in Fig. 12, can be used 

 in cases of emergency, but it is not advisable to de- 

 pend upon a tent altogether. Many nurserymen have 

 found a small box tent, similar to the one shown in 

 Fig. 32, very useful. Still others have used a sheet 

 tent over a wagon-load of trees to good advantage. 

 There are some objections to a tent or box covered 

 with canvas ; in the first place, by constant use it is 

 liable to be torn, and, secondly (and most important), 

 the cubic capacity of space enclosed under a sheet tent 

 will vary with the amount of stock fumigated. Herein 

 lies the greatest source of error, inasmuch as the 

 chemicals must be weighed every time for each indi- 

 vidual lot of trees treated. Where the box or Emory 



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