124 



SCIENTIFIC AGRICULTURE 



March, 1921. 



grown l<i the third geueratiou and re-inoculated gave a 

 proportion of i^lants that eoutiuued to breed true for re- 

 sistance to both strains in subsequent generations. Of 

 the susceptible class three-sevenths were resistant to 

 Strain A. but susceptible to Strain B., three sevenths re- 

 sistant to Strain B. but susceptible to Strain A and the 

 remaining one-seventh susceptible to both strains of the 

 causal organism. Thus we see that by crossing the two 

 varieties of beans mentioned it was possible to isolate 

 not only strams resistant to, but also strains susceptible 

 to, both strains of the anthracnose fungus, without re- 

 source to either a homozygous resistant or a homozygous 

 susceptible variety. 



Tlie enormous losses entailed annually from disea.ses 

 apparently beyond our control by artificial means as 

 well as the labor and expense of our sprayings and seed 

 treatments, point to the necessity of furthering as rap- 

 idly as possible natural means of control. Each year we 

 I)atiently submit to losses from various diseases of our 

 cei-eal aiid horticultural crops when such losses could be 

 prevented by intelligent breeding of resistant varieties. 



The need "of the hour, then, is the closer co-operation 

 between the plant pathologists and the plant breeders of 

 the country, investigators with special training in pa- 

 thological plant breeding, and finally sufficient moral 

 and financial support to carry tliis work forward to a 

 successful termination. 



Literature. 



(1) Ann. de I'lnst. Pasteur. Vol. I'S, 1899. 



(2) Nuov. Giorn. Bot. Hal 23: 361. 1891. 



(3) Compt. Bend. 135; 10(57. 1902. 



(4) Jour. Roy. Eort. Soc. 28: 142. 1903. 



(5) Md. Agr. Expt. Stn. Bull. 192. 1916. 



(6) N. Dak. Expt. Stn. Ann. Be.pt. 13, 1903, and 14, 

 1904. 



(7) Jour. Agr. Science. 3 : 102. 1908. 



(8) Alst. in Internat. Bev. 8ci. Pract. Agr. 9: 674- 

 675. 1918. 



(9) Col. Agr. Expt. Stn. Bui. 104. 1905. 



(10) A.B.A. Rept. 1: 190-191. 1905. 



(11) V. S. Plant hid. Bui. 86; 7-67. 1907. 



(12) A.B.A. Bcpt. 3: 190-195. 1907. 



(13) Phi/topath. 4: 398. 1914. 



(14) Wis. Agr. Expt. Stn. Res. Bui. 38, 1915. 



(15) Phijtopath. 5: 303-311. 1915. 



(16) Jour. Agr. Sci. 1: 40-44. 1905. 



(17) Lund's Universitets Arsskrift N.P. Afd. 2. 7: 

 57-82. 1911. 



(18) Science 25: 388-389. 1907. 



(19) Jour. Agr. Bes. 11: 373-606. 1917. 



(20) Phytopath 8: 12. 589-614. 1918. 



ANNUAL MEETING OF THE QUEBEC SOCIETY 

 FOR THE PROTECTION OF PLANTS. 



Tlie tliirtecuth annual meeting of the above Society 

 was held at Macdonald College on March 1st, 1921, and 

 tlie meml)ei's were cordially welcomed by the Principal, 

 Dr. P. C. Harrison. There was a good attendance of 

 members and associates and keen interest was evinced 

 in the papers presented. In addition to papers by reg- 

 ular members, tliree addresses were given by visitors 

 as follows : — 



Prof. H. H. Whetzel, head of the Department of 

 Plant Pathology at Coi-nell University, on "The Pre- 

 sent Status of Plant Pathology in Agriculture ; ' ' 



Dr. \V. T. MacClement, head of the Department of 

 Botany at Queen's University, on "Our Bird Allies." 



Mr. A. Gibson, Dominion Entomologist, on "The 

 Work of the Entomological Branch." 



Professor Whetzel instanced the great strides made 



in New York State towards efficient and hearty co- 

 operation between farmers, fruit growers, etc., and the 

 staffs of Agricultural Colleges. He pointed out that the 

 tendency is to demand trained men in Plant Patho- 

 logy in every agricudtural centre, just as doctors of 

 human ills and veterinarians are required in every 

 centre. The time will come when the Plant Patholo- 

 gist will "liang out his shingle" and be successful. 



Dr. MacClement gave a splendid address, well-il- 

 lustrated, on those birds useful and liarmful to agri- 

 culture. Charts showing the food content of young 

 and adult birds gave force to his arguments that useful 

 birds should be protected and encouraged. 



Mr. Gibson illustrated his address by slides of the 

 laboratories and insectaries in different centres where 

 the Entomolgical Branch has stations. 



The papers by Mr. Kelsall on tlie ' ' Chemistry of 

 Sprays" and by Mr. Petch on "Spraying versus Dust- 

 ing" were excellent and gave rise to considerable dis- 

 cussion. Kelsall showed exactly what reactions take 

 place, and under what conditions, when sprays are 

 used. Moisture and excretions from the fungus itself 

 play a most important part in making a fungicide ef- 

 ficient. The questions of leaf injury and the use of 

 calcium arsenate were dealt with iu detail. 



Mr. Petch finds that dusting is on the whole better, 

 more easily carried out, and is becoming clieaper than 

 spraying. This view was generally held to lie true by 

 the meeting, the only point of difficulty being the 

 control of Black Rot in the orchard. 



Prof. Lochhead, in his Presidential Address, di.scussed 

 the "Story of Sprays" and a copy of his paper appears 

 in the present issue, 



Mr. L. S. McLaine presented an illustrated paper on 

 "The Discovery of the European Corn Borer in South- 

 ern Ontario," discussing the area involved, the methods 

 of disinfection and quarantine. 



Dr. G. P. McRostie took up the question of plant 

 breeding for immunity and a copy of his paper also ap- 

 pears in the present issue of "Scientific Agriculture." 



Mr. Hocke.y was unfortunately ill in hospital, but his 

 paper was read by Prof. Dickson. There is no reference 

 in literature to the germination of the teliospores of 

 Puccinia Antirrhini causting rust of Snapdragon, but 

 Mr. Hockey was able to get as high as 22 per cent, ger- 

 mination and sporidia developed on the promycelia. 

 No infection occurred on the Snapdragon by sporidia, 

 so that if there is an aerial stage, it probably occurs on 

 an alternate host. 



The Frencli members presented a series of jiajiers as 

 follows : — 



"Protective Seed Treatment", by Mr. G. Maheux, 

 Provincial Entomologist for Quebec. 



"Protective Treatment of Woods used on the Farm" 

 by Ml-. A. Roy, of the Forest Service. 



' ' Observation on the Potato Plant Louse, ' ' by Mr. 

 0. Caron, Assistant Entomologist, Quebec. 



"The Larch Aphis," by Dr. J. C. Chapais, and 



' ' Care of Shade Trees on the Farm, ' ' by Mr. J. E. 

 Gravel, Foi-est Service, Quebec. 



Reports of delegates to the Ontario Entomological 

 Society and the Canadian Branch of the Phytopatho- 

 logical Society were given. 



The officers for the ensuing year are as follows : 



President, Prof. W. Lochhead, Professor of Zoology 

 and Entomology, Macdonald College. 



Vice-President, Rev. Fr. Leopold, Director, Oka Agri- 

 cultural College. 



Secretary-Treasurer, Prof. B. T. Dickson, Professor 

 of Botany, Macdonald College. 



