Figure 7. — A stand rendered nonproductive by worked-out slash pines. 



W^M^S§:' 



F273052 



It is the common practice to hang cups on only a 

 portion of the trees 9 inches in diameter and larger; 

 but since the trees on which two or more cups are 

 hung make up for the uncupped trees, the total 

 number of incoming trees 9 inches and larger can 

 be expected under current practices to yield more 

 than 4% million cups each year if they are all dedi- 

 cated to gum naval stores operation. An analysis 

 of naval stores operations in northeastern Florida 

 indicates that, in a continuous (or sustained-yield) 

 operation, approximately \1% crops of 10,000 cups 

 each must be hung each year on new round trees 

 to maintain a total working body of 100 crops. 

 The annual addition of new faces on round trees 

 would, therefore, maintain a total working body of 

 nearly 37 }£ million cups, or 3,740 crops. Since an 

 increase in cupping must start with virgin faces 

 and is extended into the working body year by year, 

 it would probably take about 1 5 years to arrive at 

 the full working body justified by the annual sus- 

 tained income of new faces. 



If it be assumed that production of naval stores 

 will average 45 units per crop (in 1933-34 produc- 

 tion averaged 43 units per crop when 24 percent 

 of the cups were hung on trees under 9 inches 



d. b. h.), an annual sustained yield of 168,000 

 units appears possible. This figure may be com- 

 pared with the 1933-34 production of 81,610 units. 

 In 1934, less than 100,000 round turpentine pines 

 were cut for wood products. An annual cut of 

 this size from 9-inch and larger trees would reduce 

 the attainable sustained yield by only 450 units. 

 If the present practice of hanging cups on trees 

 smaller than 9 inches is continued in the future, 

 the number of cups that could be hung on fresh 

 trees each year would be increased to about 4% 

 million. The inclusion of the smaller trees would, 

 however, reduce the yield per crop and although 

 an annual sustained yield of 168,000 units could be 

 maintained, it would come from a larger number 

 of trees. A much larger production than that indi- 

 cated above could be maintained for several years, 

 but this would probably result in a reduction in 

 the sustained-yield possibilities for the area until the 

 restocking of second growth could overcome the in- 

 roads in the present growing stock. In some sections, 

 owing to the scattered nature of suitable timber, 

 naval stores men will probably be hard pressed to 

 maintain their operations at present levels without 

 sacrificing a part of the basic growing stock. 



23 



