803 JOURNAL, OP FORESTRY 



A popular discussion of Armillaria mellea on 

 Root Rot various conifers in Great Britain is given. It is 



of Conifers stated that probably no species of conifer is 



immune. The usual symptoms are briefly de- 

 scribed. The most susceptible confers are said to be Corsican pine, 

 Weymouth (white) pine, Scots pine, and Sitka spruce. Deodar is 

 often killed. Norway spruce is not very susceptible when young. 

 Larch is often very resistant. Douglas fir is probably the least sus- 

 ceptible. The disease is chiefly to be feared where oak and beech 

 have been removed and conifers planted. Destruction of sporophores 

 is rcommended as well as trenching isolated infections. The trenches 

 should be about 9 inches deep and kept open. Small infected plants 

 should be removed and replaced with broadleaf species. Grubbing 

 stumps is said to be the best method of combat, but expensive. 



C. J. H. 



Root Rot of Conifers. Forestry Commission, Great Britain, Leaflet 6, 4 pp., 

 2 figs. 



Statistics of past and present protection, stand. 

 The Cost of and forest area are given, together with a com- 

 Forcst Fire parison of growth and cut. Also includes figures 



Pvoteciion of the number, acreage, and loss from fires. The 



cost items of a fire protection system are out- 

 lined, and indicate a rate of 1.8 cents per acre, or $0.0015 per $100 

 valuation. J. K., Jr. 



Peters, J. G. Lumber, S78 :30g-30h, 1921. 



The root and basal trunk rot due to Fomes 

 Conifer ainiosits is discussed. It is said to be the most 



Heart Rot frecjuent cause of heart rot in various confers in 



Great Britain. When old trees are attacked they 

 are seldom killed. Young trees, however, rapidly succumb in a man- 

 ner similar to those attacked by Armillaria meallea. The fungus enters 

 underground parts through wounds or dead roots and the rot is fre- 

 quently unsuspected until thinnings are made. If the infection is 

 quite general it is recommended that the crop be utilized at an early 

 opportunity. Blanks due to the fungus should be filled in with broad- 

 leaf species, which are free from attack. Larches and spruces suffer 

 most, but Douglas fir is not seriously afifected except when young, when 



