146 PROTECTIOX OF PLANTS — 1923-24 



Duflf, G. H. The Occurrence and Frequency of Species of Ribes and Grossularia in Ontario. 

 Ann. Kept. Min. Lands and Forests, Ont. for 1921-1922: 254-263. 3 fig. 1923.— The report 

 of a sur\ey from Petawawa on the Ottawa ri%'er to Georgian Bay undertaken in order to secure 

 definite data on the occurrence of wild Ribes and to learn if any ecological relationships existed 

 which might be of value wshould eradication ever become necessary. The results of the inves- 

 tigation showed that Rihcs are so numerous and occur so generallj' that a programme of eradica- 

 tion could onlj' be undertaken at a very high cost. 



Eastham, J. W. Fungicides. Sci. Agric. 3: 190-191. 1923.- — A brief discus.sion of present 

 methods of combatting plant diseases. No attempt, apparently, has been made to test the efficacy 

 of a large number of various chemicals upon different plant pathogens, most fungicides being modi- 

 fications of the copper sulphate or lime sulphur groups. Local conditions often require the modi- 

 fication of a formula which is quite satisfactory elsewhere. 



Eastham, J. W. Some Potato Disease Pi'oblems in British Columbia. Sci. Agric. 4: 89-94. 

 1923. — An account of the most important potato diseases occurring in British Columbia Leaf 

 roll is not rearly as common as in Eastern Canada but mosaic occurs very frequently. 



Eastham, J. W. Report of Provincial Plant Pathologist, Vancouver. 17th Ann. Rept. 

 B. C. Dept. Agric. for 1922:66-70. 1923. — Wilt of sunflowers caused by Sderoii/uasp. and mosaic 

 of red raspberry were noted for the first time. The status of blister rust in British Columbia is 

 described. 



Faull, J. H. Forest Pathology: In Report of Forestry Branch, 1922. Ann. Rept. Min. 

 Lands and Forests, Ont. for 1921-1922: 245-264. lig. 5-9. 1923.— "Red branch" of balsam, 

 pine, and cedar due to injury by Monahamus spp. late in the season is described. A preliminary 

 description of fi\e types of butt and heart rots of balsam is given. — A list of balsam rusts occurring 

 in Temagami is appended; this includes two new species described by Bell. 



Eraser, W. P., and P. M. Simmonds. Co-operative Experiments with Copper Carbonate 

 Dust and Other Substances for Smut Control. Sci. Agric. 3: 297-302. 1923.— The results 

 of extensive experiments upon control of smut indicate that copper carbonate is the most effective 

 of a number of dusts tested for this purpose. With heavily infected seed the formaldahyde treat- 

 ment gives better results and so, while dusting has certain advantages, it is not recommended 

 that it be substituted for this form of treatment until it has been further inv^estigated. 



Gussow, H. T. Interim Report of the Dominion Botanist. Canada, Dept. Agric. Exp. 

 Farms Branch for 1921-1922: 1-73. 3 fig. 1922. — The usual annual report of the wotk carried 

 on by the Division of Botany. Attention is drawn to the sections dealing with forest pathology, 

 potato inspection, leaf curl and mosaic of raspberries, and cereal rusts. 



Gussow, H. T. Report of the Dominion Botanist. Canada, Dept. Agric. Exp. Farms 

 Branch for 1922-1923; 1-74. Fig. 1-10. 1923.— The annual report of the Division of Botany 

 containing accounts of the various phases of investigative work carried on at the central and 

 field laboratories. 



Hind, H. Y. Essay on the Insects and Diseases injurious to the wheat Crops. 1-139. 

 Toronto. 1857.^In 1856 the Bureau of Agriculture and Statistics of the Government of Upper 

 Canada offered three prizes of L40, L25 and L15 for the three best essays, respectively, on the 

 "Origin, nature, and habits.^ — and the history of the progress, from time to time, — and the cause 

 of the progress, of the weevil, Hessian fly, midge, and such other insects as have made ravages on 

 the wheat crops in Canada; and on such diseases as the wheat crops have been subjected to, and 

 on the best means of evading or guarding against them". This essay, by the professor of chemistry 

 at Trinity College. Toronto, won the first prize. 



At that time entomology was apparently more highly developed than plant pathology since, 

 of a total of seven chapters. six are devoted to the consideration of injurious insects. In the chapter 

 on wheat diseases rust, smut, and ergot are dealt with and the writer has many quaint miscoii- 

 ceptions in regard to the nature of these fimgi. Thus, "Rust is the growth of two kinds of fungi, 

 uredo rubigo and uredo linearis". It is interesting to note that the author suspects that the rust 

 spores gain entrance to the wheat plant l)y way of the stomata. 



As for control it is recommanded that powdered charcoal be distributed over the wheatfields 

 in order to absorb the atmosphoric ammonia, which it is believed, favours the development of 

 rust by "stimulating the growth of the .sporules in the stagnated juices of the plants." In addi- 

 tion, early sowing and 'the selection of flinty-stemmed v-arieties whose stomata on the stalk will 

 have in great part closed before the "time for rust" are advised. 



Hockev, J. F. Blue Stem of Black Raspberry. 15th Ann. Rept. Que. Soc. Prot. Plants for 

 1922-1923 :"92-93. 1923.— This disease is reported for the first time from the Niagara Peninsula. 

 .\ fungus closelv resembling Acrostalag)7ius caulophayxs Lawrence was isolated from diseased canes 



Howitt, J." E. Two Diseases New to Ontario. Sci. Agric. 3: 1S9. 1923.— Pink root of 

 onions {Fusariuni malli Taub.) and white rot of grapes (C'^mothyrium diplodicdn} (Speg.) (Sacc.) 

 were observed for the first time in south-western Ontario. 



Kelsall, A. Experiments on the Dust Method of Smut control. Sci. Agric. 3: 303-307. 

 1923. — These experiments show that the dusting method of treatment for smut does not give per- 



