148 EEPORT OF THE No. S 



berries, and the spreading march commences anew. The eradication of the disease 

 accordingly can only be brought about by the destruction of the hosts in infected 

 areas. 



The stage of the rust upon the pine is the one in which the chief damage is 

 done. The fungus lives year after year in the bark tissues of the pine until the 

 stem or branch is girdled and the portion above dies. It is sure to kill the affected 

 trees if the attack is on the stem. 



During the past season we have had six Inspectors travelling throughout the 

 older parts of Ontario locating where the disease may have obtained a foothold. 



In addition to the work of these Inspectors, we have had very valuable assist- 

 ance and co-operation from Mr. McCubbin who has charge of the Federal office of 

 plant pathology at St. Catharines. We have also had the valued assistance of Prof. 

 Howitt, Botanist of the Ontario Agricultural College. The following is a summary 

 of the location and status of the disease as it now exists in Ontario : — 



A. — Eastern Limit. 



I. Durham County. 



1. Clarke Tp. — One pine and a few adjacent currants diseased in 1915. 



No trace of disease found in 1916. 



2. Darlington Tp. — Seventy-five pines diseased. Currant rusted area in- 



volved eight miles in a north and south direction; survey for east 

 and west limits unfinished. All infected pine removed. 



II. Victoria County. 



1. Ops Tp. — ^Three pines diseased. Currant rust progressed a maximum 

 distance of three miles .(S. E.) from original centre, involving 

 ninety hushes in ten town gardens. All infected pines removed. 



B. — ^NoBTHEBN Limit. 



I. Simcoe County. 



1. W. Gwillimbury Tp. — ^One hundred and ninety-four pines diseased. Cur- 

 rant rusted area now eleven miles square. All infected pines 

 removed. 



C. — ^Western Limit. 



I. Elgin County. 



1. Dunwich Tp. — ^Currant rust found in 1915. No currant rust found in 



1916. 



2. Bayham Tp. — Eight rusted currant bushes in two locations. 



D. — InteIiiob. 



I. Wellington County. — One infected pine found early in spring and removed. 

 No currant infection in 1916. 



II. Brant County. 



1. Brantford Tp. — ^^Two pines and one currant bush diseased in 1915. No 

 trace of disease in 1916. 



III. Halton County. 



1. Trafalgar Tp. — ^Eight trees and currant rust in 1915. Twenty-two trees 

 in 1916; much currant rust in 1916 on seventeen properties. 



E. — Niagara Peninsula. 



I. Wentivorth County. 



1. Saltfieet Tp.— Rust in seven currant properties. 



II. Haldimand County. 



1. S. Cayuga Tp. — ^^Two rusted currant bushes. 



