124 Journal of the Department of Agriculture. 



THE ERADICATION OF CITRUS CANKER. 



By E. M. DoiDGE, M.A., D.Sc, F.L.S., Mycologist, 

 Division of Botany. 



In the South African Journal of Industries for January, 1919, the 

 citrus canker situation up to December, 1918, was reviewed by 

 Dr. Pole Evans in an article entitled " Citrus Canker in South Africa 

 and its Eradication." 



The progress made during the past few months has fully justified 

 the determination of the Government to continue the eradication 

 campaign, and there is every indication that the opinion expressed by 

 Dr. Pole Evans that eradication can be accomplished in two or three 

 years' time will be justified. 



The following table shows the number of orchard trees found 

 infected each month from 1st July, 1917, when the regular inspection 

 was organized : — 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



Canker has been found on 98 properties, on 53 of these all citrus 

 trees have been destroyed, so that there is no possibility of reinfection. 

 The total sum paid in compensation up to date is £71,862. 17s. 8d. 



A more detailed statement is appended showing the farms 

 involved and the localities where canker is likely to recur, and the 

 accompanying maps illustrate the progress of the disease since the 

 publication of the article in the Journal of Industries for January, 

 1919. 



