52 



PROTECTION OF PLANTS, 1921-22 



ducts to any and all parts not already affected, is readily understood and in 

 carrjung out the regulations several infringements have already been discovered. 

 The confinement of the insect to the minimum area is not only important in 

 regard to crop losses caused by it, but also in reducing the difficulty in the adop- 

 tion of control measures. The only sections experiencing extreme damages 

 thus far in Ontario have been confined to Elgin and Middlesex counties, more 

 particularly Elgin county. In view of this a second quarantine has been pla- 

 ced on these two counties, which prevents the movement of products affected 

 by the quarantine to points outside the two counties. 



PLANT DISEASES OF 1921 IN QUEBEC 

 By B. T. Dickson, Professor of Botany, Macdonald College 



The year 1921 in Quebec was typically a year of Fusarium root-rots and of 

 mosaics. 



Field peas were severely attacked by F. lathyri, beans by F. martii phaseoli 

 and asters by F. orthoceras. It was difficult to grow sweet peas in any light soil 

 owing to the heavy infection by F. lathyri in July and August. 



Fig. 1. — Plant diseases of 1921 Mosaic of Red Clover (T. pratense) 



