SCOTS PINE 403 



former succeed. It is, however, preferable not to mix them 

 unless there is any special reason for so doing. 



Scots and Weymouth Pine may, in the same way, be 

 advisable if the success of pure Weymouth Pine be doubtful. 



Scots Pine often pay well when grown on short rotations 

 of 35 to 40 years, if there be a market for pit wood. 



The land is left clean at the end of a short rotation, but 

 is very foul at the end of a long rotation, if a pure crop has 

 been grown. 



The natural regeneration of Scots Pine should only be 

 attempted by leaving strips of trees, and allowing the seed 

 to blow on to a vacant area. Wherever heather land exists, 

 a young crop can usually be easily established from seed. 

 But it will seldom be possible, except, perhaps, on northern 

 aspects at high altitudes, to obtain natural regeneration on 

 land from which a crop has just been cleared ; for, though 

 originally heather land, it will, in most cases, be found to be 

 covered with grass, owing to the soil improvement that has 

 taken place. Such would not, however, usually be the case 

 in dry continental climates. 



Rotation. This should be about 80 to 90 years for large 

 mature timber. 



Average returns from pure crops in high forest should be, 

 per acre : 



Thinnings . . . 1050 cub. ft. to 2 in. q. g. 

 Final yield (at 80 years) . 3450 6 

 Total production . . 5 2O 2 



Average annual increment, 65 cub. ft. 



Equivalent net rental 1 for land only ) at 3%= is. 3d. 



(from date of planting) ) at 4% = minus 35. 4d. 



Of Fungi. Phytophthora omnivera attacks seedlings. 



Hysterium pinastri ( = Lophodermium pinastri), known 

 as the Leaf-shedding disease, attacks young trees, especially 

 those from I to 7 or 8 years of age. 



Botrytis cinerea attacks the foliage and young shoots, 



1 After deducting interest on ^8, the cost of planting and establishing 

 the crop. 



