396 SYLVICULTURAL NOTES ON TIMBER TREES 



Larch, also, can advisedly be grown as standards in high 

 forest with coppice ; new plantations under this system can be 

 formed by planting Larch and Spanish Chestnut alternately, 

 and subsequently coppicing the Spanish Chestnut. 



Rotation. The rotation should be from 70 to 80 years, 

 though shorter rotations often prove very profitable for pit 

 timber. 



Average returns from pure crops in high forest should be, 

 per acre : 



Thinnings . . . 1360 cub. ft. to 2 in. q. g. 

 Final yield (at 70 years) . 3000 6 

 Total production . . 4760 2 



Average annual increment, 68 cub. ft. q. g. 



Equivalent net rental l for land only | at 3%= I7s. 2d. 

 (from date of planting) j at 4%= ios. 



Of Fungi. The Dasyscypha calycina (or Peziza Will- 

 kommii) = The Larch Disease or Larch Blister Disease, 



does immense damage to young crops, especially up to about 

 the 2Oth year. 



On account of this disease, the growing of European 

 Larch is now a most risky undertaking ; the Japanese Larch 

 has, however, hitherto proved more or less immune. 



In order to combat the spread of the disease, great care 

 should be taken that all seedlings be raised from seed 

 obtained from strong, healthy trees ; for, the individual vigour 

 of trees is hereditary. The produce of sickly trees has a 

 predisposition to be attacked, though the disease is probably 

 not actually hereditary. 



In this connection the use of home-grown seed should 

 always be tabooed, as the summer heat in this country is not 

 sufficient for the production of the finest seed. 



Phytophthora omnivera sometimes kills young seedlings. 



Agaricus melleus = The Honey Fungus, characterised by 

 its black rhizomorph strands and its cluster of mushroom-like 



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

 the crop. 



