FOREST CONDITIONS IN DELAWARE. 



43 



soon as the mature tree is weakened by storms, it also becomes a mark 

 for these attacks. The removal, therefore, of all but the sound and 

 healthy trees in loblolly stands is always a wise preventive measure 

 against insect pests and fungous diseases. 



Growth and Yield of Pure Stands. In the management of loblolly 

 pine it is desirable to secure and maintain even-aged, well stocked 

 stands, because the quantity and quality yield of such stands will be 

 the highest. (See figure 4.) The tables below indicate the growth and 



Fig. 4. Pure well-stocked stand of Loblolly Pine, which sprung up on old fields. 



yield of such stands. The measurements for these tables were taken in 

 stands established by natural seeding for the most part on abandoned 

 fields in Worcester County, Maryland. This county adjoins Sussex on 

 the south, and the tables apply equally well to both. The yield in cubic 

 feet includes all the trees in the stand, while that for board feet in- 

 cludes only trees 6 inches and over in diameter at breastheight, or 4J 

 feet above the ground. 



