58 PROTECTION OI PLANTS, 1921-22 



later reported from Victoria, Australia, by McAlpine and from South Africa 

 by Doidge. 



Late blight was not noticed until about September 1st and during the warm, 

 wet period following it became pronounced. In storage during the middle and 

 late winter, extensive rotting occurred, doubtless due to Phytophthora infestans 

 in part, with Fnsarium spp. contributing largely as a result of invasion throagh 

 lesions and injuries in immature skins. 



Onion smut {Urocystis cepuloe) was serious in one or two market gardens 

 in the vicinity of Montreal. 



Beans were affected by anthracnose but the most serious loss was caused 

 by blight (Ps. phaseoli). 



Sclerotinia disease of sunflower has been present during the last two 

 seasons to a slight extent, but during 1921 it was present up to 2% in one 

 of the experimental plots at the College. 



Soft rot of cabbage, cauliflower and turnip was found in localized areas. 

 Rhizome rot of Iris, caused by B. carotovorus, was present in practically every 

 Iris bed on the Island of Montrea.', and at Macdonald College it has been the 

 major cause in the loss of some one hundred and twenty varieties during the 

 last five years. 



Rhubarb in gardens was found to be affected by Phyllostida straminella 

 causing leaf spot and CoUectotrichum erumpens causing principally a leaf 

 stalk rot. Both these diseases are new in Quebec and were recently' described 

 by F. L, Stevens (Ball. 213, Illinois Agricultural Experiment Station). 



Peonies were slightly affected by Botrytis blight and seriously by a leaf 

 spot disease which is being studied by ^Ir. Coulson of this Department. 



Of .the fruit diseases apple scab was well controlled, black rot of apple was 

 present in many orchards, silver leaf was present but not serious, brown rot of 

 plums (*S. cinerea) and bladder plums {E. pruni) were fairly common, and rasp- 

 berry curl was severe generally. 



Unfortunately it was impossible to make a detailed survey in order to deter- 

 mine the actual percentages of infection in the various crops but these notes 

 ndicite the chief diseases nresent. 



