128 PEOTECTION OF PLANTS — 1922-23 



Dickson, B. T. Diseases of the Potato. Sci. Agric. 2: 234-236. Fig. 11-12. 

 1922. — Notes on a stalk disease caused by "Sclerotinia sp." and on little potato 

 caused by "Corticiu^n vagum "B. and C. var. "solani^^ Burt. 



Dickson, B. T. Diseases of the Potato. Sci. Agric. 2: 310-312. 1922.— 

 Early blight, fusariose, com^non scab, skin spot, and. silver scurf ore treated briefly. 



Dickson, B.T. Diseases of the Potato. Sci. Agric. 2: 325-327. Fig. 13-14 

 1922. — Notes on dry rot, net necrosis, and black dot disease. This latter is appa- 

 rently due to " y ermicalaria varians." 



Dickson, B. T. Diseasejs of the Potato. Sci. Agric. 2: 417-419. 1922.— 

 Brief notes on various physiological troubles. 



Dickson, B. T. Plant diseases of 1921 in Quebec. 14th Ann. Rept. Que. Soc. 

 Prot. Plants for 1921— 1922: 52-58 Fig. 1-8. 1922. 



Dickson, B. T Diseases of the Potato. 14th Ann. Rept. Que. Soc. Prot. 

 Plants for 1922-1922: 67-105. Fig. 1-12. 1922. 



Dickson, B. T. Studies Concerning Mosaic Diseases. Macdonald Coll. 

 Tech. Btdl. No. 1-125. PI. 1-2: 1922 — A very comprehensive list of plants 

 known to be affected by mosaic is given The pathological histology of a large num- 

 ber of various species of plants affected with mosaic has been studied and numerous 

 histological features are found to be common to all The effect of coloured light on 

 tobacco mosaic and the effect of coloured light, sunlight, darkness, and freezing on 

 the expressed juice of tobacco mosaic plants ivas studied. Mosaic ivas found to be 

 transmitted by aphids and seed inheritance ivas established for several species. 



Eastham, J . W . Report of Provincial Plant Pathologist, Vancouver. 16th 

 Ann. Rept. B. C. Dept. Agric. for 1921: 64-69. 1922. — Three diseases not noticed 

 previously were observed during the year. These were clover wilt "(Sclerotinia 

 trifoliorum) ," buck-eye rot of tomato {" Phytophthora terrestriay , and blister rust 

 of white pine ("Cronartium ribicola). 



Faull, J. H. Forest Pathology: In Report of Forestry Branch, 1921. Ann. 

 Rept. Min. Lands and Forests, Ont. for 1910-1921: 259-266. Fig. I-4. 1922. 

 — Observations were continued upon white pine needle blight in the Temagami 

 Forest Reserve and these confirmed previous conclusions which had been drawn in 

 regard to this disease. The reddening of the leaves is due to the death of the absor- 

 bing roots which, in turn, is ascribed to a drying-out process that occurs in shallow 

 soils in periods of drought.. It is probable that other tree species are affected in a 

 similar manner. — A general investigation of butt rots of conifers is being carried on. 

 In this work a root and butt rot of spruce, hemlock, and white pine has been observed 

 for the first time. With this decay, which is of the type caused by Trametes pini, 

 a stalked poly pore, ^Polyporus tomentosus,^' is constantly associated. A prelimi- 

 nary account of the true tinder fungus " {Fomes fo7nentarious)^' is given in which it 

 is recorded that instead of causing a sap rot as commonly supposed this fungus seems 

 invariably to commence work in the heartwood of its hosts — Poplar canker {"Dothi- 

 chiza populea)" has been observed near Toronto causing much damage to a planta- 

 tion of Lombardy poplars. 



Faidl, J. H. Forest Pathology in Relation to Forest Conservation. 14th 

 Ann. Rept. Que. Soc. Prot. Plants for 1921-1922] 14-22. Fig. 1-5. 1922. 



