550 Forestry Quarterly 



Western larch, Western Yellow pine, Lodgepole pine and Douglas 

 fir. Reduction of the leaf surface of a tree causes reduction in 

 both height and diameter growth. Severe infection throughout 

 the crown of a tree often results in its death. Mistletoe infection, 

 by weakening trees, makes them much more susceptible to fungi 

 and insect attack. Young seedlings usually die shortly after re- 

 ceiving the infection. 



Suggestions for control of the pest offered by the United States 

 Forest Service, in a recent bulletin setting forth results of studies 

 made along this line, are: (1) in logging operations infected trees 

 should be marked for cutting; (2) pure stands of susceptible trees 

 should not be established in regions where the pest is prevalent; 



(3) the mistletoe is a light-loving plant; also mistletoe seed may 

 be carried great distances — one quarter of a mile was reported in 

 one case; therefore close stands minimize the danger of infection; 



(4) all infected, isolated seed trees should be destroyed. 



C. J. Himiphrey, Pathologist in the Bureau of Plant Industry, 

 United States Departm^ent of Agriciiltiu*e, has prepared a useful 

 bulletin (typewritten) on Sanitary Handling of Timber, calling 

 special attention to the need of preventing infection with root- 

 producing fungi during storage of timber, which are the cause of 

 rot in buildings. The cause and conditions of rot are set forth 

 with reference to usual conditions in practical handling. The 

 means for prevention of infection are discussed with regard to 

 location of yards, cleaning of yards, care in handling sticks and 

 stacking limiber, construction of pile foundations, treatment with 

 preservatives, and use in buildings. 



Mr. G. N. Lamb has prepared an important chart, or calendar, 

 which shows, for the common trees of the eastern United States, 

 the dates of leafing, flowering, "in foliage," seed ripening, seed 

 falling, and leaf falling. The chart is the result of a compilation 

 of data obtained by observers of the Forest Service and also by 

 individuals working alone. The major activities of plants indicate 

 clearly the advance of the season, for these activities depend 

 upon the interaction of a nimiber of weather elements, e. g., 

 temperature, precipitation, himiidity, and evaporation. Trees, 

 being the most conspicuous plants and Uving for many years, lend 

 themselves to phenological observations. There is thus a large 

 body of available material for study along these lines. The tree 



