112 PEOTECTION OF PLANTS, 1921-22 



that this form and Polyporus sulphureus were closely related. This view, however, is shown 

 to be erroneous. The gross and histological features of the decay produced by this fungus- 

 together with an account of its distribution and hosts, are also described. 



Fatjll, J. H. — Preliminary Report: In Report of the Forestry Branch, 1918. Ann. Rept. 

 Min. of Lands ,Forests and Mines, Ont. for 1917-1918: 166-160. 1919.— An introductory note on 

 needle blight of white pine, a disease which is characterized by the progressive reddening of the 

 new leaves as they unfold from the buds until from one to two thirds of the total length at maturity 

 are involved. Several hundred diseased trees were marked for further study. 



Faull, J. a.— Report for 1919. Ann. Rept. Min. Lands, Forests and Mines, Ont. for 1918- 

 1919: 119-125. 1920. — Observations made on coniferous trees at a distance of four to six miles 

 from winter roasting beds indicate that no injury occurs in winter from sulphur fumes. Analysis 

 of the results obtained from a study of marked trees indicated that blighted young white pines 

 usually recover while a variable percentage of older trees also recover but more slowly. The 

 mortality in old trees is about 5%. In an endeavour to determine the cause of needle blight 

 several hundred inoculations, using juice from diseased foliage, were made on healthy twigs 

 of healthv trees. No infection resulted, however. The root systems of several small, blighted 

 trees were next examined. This revealed the seat of the trouble. The main branches of these 

 root systems were in most cases killed back from 4-12 inches or more from the tips and few of the 

 laterals appeared very healthy. In contrast the root systems of young, healthy trees were normal. 

 The leaf injury, then, is due to the fact that, in early summer, when there is a sudden increase 

 in the water requirements of the tree the roots are unable to supply it. The cause of the root 

 injury is, as yet, unknown though drought seems the most likely explanation. A list of tree 

 diseases observed in Northern Ontario is appended. 



Faull, J H. — Forest Pathology In Report of The Forestry Branch, 1920. Ann. Rept. Min. 

 Lands and Forests, Ont. for 1919-1920: 224-235. 9 fig. 1921.— Continuing the study of white 

 pine needle blight , observations on marked trees indicate that affected trees up to six in 

 diameter are likely to recover but the death rate in older trees is much higher wuth recovery 

 more uncertain and slower. Temperatiu-e records show that frost is not a factor in the occurrence 

 of blight. Winter browning of the foliage of coniferous trees was very prevalent in 1920. In 

 some cases trees were killed outright and in other twigs and small branches as well as foliage 

 suffered. This injury is usually localized, occlirring on the south side of the tree and in the 

 lower portion of the crown. It is due to transpiration occurring when the ground is frozen and 

 the roots are unable to replace the water given off by the leaves. "Red branch" of balsam is 

 ascribed to insect wounding of the bark late in the season followed by winter frosts. A twig 

 blight of balsam and canker of poplar are also mentioned together with a preliminary note on heart 

 rots of coniferous trees. 



Fletcher, J. — Smuts in small grain. Central Exp. Farms Rept. 141-142. 1 fig. 122-124. 

 3 fig. 1895. 



Fraser W. p. — Notes of Some Plant Diseases of 1913. 6th Ann. Rept. Que. Soc. Prot. 

 Plants for 1913-1914: 45-50. 3 fig. 1914. 



Fraser, W. P. — Storage Rots of Potatoes and Other Vegetables. 6th Ann. Rept. Que. Soc. 

 Prot. Plants' for 1913-1914: 50-51. 1914. 



Fraser, AV. F.—The Cereal Rusts. 7th Ann. Rept. Que. Soc. Prot. Plants for 1914-1915: 

 II6-I20'. 1915. 



Fr\ser, W. P. — Plant Disease Investigations in Western Canada. Agric. Gaz. Can. 8: 

 318-320. 1921.— Svstematic work in plant pathology was begun in Western Canada m 1917. 

 when an agreement was reached whereby the Dominion Government appointed and paid the 

 investigators while the universities and agricultural colleges provided laboratory and greenhouse 

 facilities. Most of the work to date has been in connection with stem rust of wheat although 

 smut of western rye grass and stripe disease of barley have also been investigated. Eight strains 

 of stem rust have been separated and plant breeding for rust resistance is being earned on at the 

 University of Saskatchewan. This is the line of research which is most promising of results in 

 cotabdtting the rust. 



Frencn, p. E.—Experi7nental work. B. C. Dept. Agric. Ann. Rept. 12: 24-28. 1917. 



