W. R. Haddow

• Distribution and occurrence of white pine (Pinus strobus Linn.) and red pine (Pinus resinosa Ait.) at the northern Limit of their range in Ontario
• Forest types and their significance
• Needle blight and late fall browning of red pine (Pinus resinosa Ait.) caused by a gall midge (Cecidomyiidae) and the fungus Pullularia pullulans (De Bary) Berkhout
• Trametes pini (Thore) Fries and the disease caused by it in Pinus strobus L.
• Trametes Pini (Thories) Fries and the disease caused by it in Punus Strobus L.
• White pine blister rust reconnaissance 1952