1716 



Canadian Foreslri/ Journal, June, 1918 



Forests and Mines. Similar action 

 should be taken in Quebec, M'ith the 

 River St. Lawrence as the base line. 

 It will be of interest here to note 

 some of the quarantines now in force 

 against the white jiine blister rust. 



specimens similar to the cut. So 

 widely spread is the disease in South- 

 ern Ontario that immediate eradica- 

 tion is out of the question. Indeed, 

 we may as well accustom ourselves 

 to the thought that the rust is pro- 



Area 



Canada 



United States.. 



California 



Delaware 



Indiana 



Kansas 



Michigan 



Massachusetts 



Minnesota 



White Pines Ribes Quarantined Area 



All None * All foreign countries: Europe and 



,\11 Asia, New England and New Y*rk 



are quarantined as regards lilack 

 currant. 



East of IVIississippi River. 



All points outside State. 



All points outside State. 



All points outside State. 



All points outside State. 

 None Europe. 



Maine, New Hampshire, Vermont, 

 Massachusetts, Rhode Island, Con- 

 necticut, New York, New Jersey, 

 Pennsylvania, Ohio, Wisconsin. 



And similar action has been taken by 

 almost a dozen other states, and as 

 in nearly all cases cited, since the 

 beginning of 1917. 



Success of Quarantine 



It is likewise significant^to em- 

 phasize the fact that local communi- 

 ties have in more than one case 

 maintained successful quarantines; 

 thus the orchardists of Rogue River 

 Valley, Oregon, combined in 1910, 

 put into effect a quarantine against 

 orchard diseases, and hired an expert 

 plant pathologist as an adviser. 

 Similarly, the melon growers of Rock- 

 ford, Colorado, have employed such 

 action with success. 



8. Scouting carried on during the 

 last two years by the Ontario and 

 federal governments has shown that 

 blister rust is spread throughout 

 practically all of southern Ontario 

 with a spot infection at Petawawa, 

 and others in Ilahburton, Victoria, 

 Peterborough and Simcoe counties. 

 Much valuable information in this 

 work has been gained through the 

 schools in response to a circular with 

 colored reproduction of a diseased 

 currant leaf sent out by the Ontario 

 Forest Service, at the suggestion of 

 Mr. \V. A. McCubbin, calling for 



bably a permanent factor with us in 

 Canada and will have to be considered 

 in future forestry propositions and 

 be combated as in the case of cereal 

 smuts, potato mildew and other 

 blights. Our commercial pine forests 

 lie mostly north of the old Canada 

 Atlantic Railway, which runs from 

 Parry Sound to Pembroke and Ot- 

 tawa, and the infection has not yet 

 crossed that line except at Petawawa. 

 It would seem most hopeful then to 

 isolate Northern Ontario, with the 

 Canada Atlantic as the southern 

 boundary, and that using this as a 

 base, operation's be directed towards 

 the south. These operations would 

 consist of scouting, of eradicating 

 spot infections, and of experimenting 

 with safety belts. In regard to the 

 last operation, there is good reason to 

 believe that the fungus will not spread 

 beyond a belt a third of a mile wide 

 if that be kept free from the alternate 

 host. Michigan touches Northern 

 Ontario along the St. Mary's River, 

 and Michigan is said to be free from 

 the disease and is guarding against it. 

 There is some infection in Southern 

 Minnesota, but the State authorities 

 are actively engaged in routing it out. 

 In Quebec, the St. Lawrence forms a 

 natural bar, and suitable action could 



