136 DEPARTMENT OF LANDS AND FORESTS FOR 1928 No. 3 



agencies and a description of each forest type as it is at present with recommen- 

 dations where necessary for its improvement. It is recommended to combine 

 the area into a working plan unit to cover some fifty years which if carried out 

 should approach something like ideal conditions at the end of that time with 

 gradual improvement as the plan progresses. 



The role which forests play in watershed protection, the prevention of 

 erosion on steep slopes, the equalization of seasonal flow in the prevention of 

 floods, and the maintaining of the purity of the water is one which is well recog- 

 nized and about which much has been written. The Loch Lomond forest survey 

 is the first in Ontario to be carried on with the primary object of watershed 

 protection in view. The report of this survey and the visible results which may 

 be expected from the progressive improvement of the forests will have con- 

 siderable bearing on future developments along this line. 



(b) Growth of Spruce and Jack Pine. — Continuing a study of the growth and 

 yield of spruce and jack pine data was collected in connection with the Timagami 

 West Forest Survey during the past summer. Several plots were measured for 

 growth of spruce. Work is now under way in the compilation of the data for 

 spruce and the construction of general yield tables. 



VI — Forest Investigations 

 Forest Pathology. 



During the season forest pathological work was continued with particular 

 reference to the snow fungus on white spruce. It is expected that a complete 

 report will be published at a later date on this investigation. 



An extensive survey was also made in the Parry Sound and Muskoka Dis- 

 tricts to determine the extent of spread of the white pine blister rust. Evidences 

 of the rust were found throughout the entire area and in the vicinity of North 

 Bay. 



Forest Entomology. 



Co-operating with the Federal Entomological Branch, two experiments 

 were carried out during the season in connection with the control of dusting 

 from aircraft of (1) the Hemlock Looper (Ellopia fiscellaria) in the Muskoka 

 District and (2) the Spruce Budworm (Cacoecia fumiferana) in the Sudbury 

 District. Encouraging results were obtained and it is expected that further 

 work will be carried on next season. 



