44 PROTECTION OF PLANTS — 1922-23 



Pea. — Mosaic was found in rather isolated areas but Stigmonose caused 

 by Macrosiphum pist was the cause of heavy losses in late crops. 

 Pod spot (Ascochyta pisi) was common. 



Cucumber, Melon, Squash. — Wilt caused by B. tracheiphilus occurred in 

 practically every plot. The wilting was of the slow -developing type. 



Onions. — Onion smut (U. cepulce) wa° serious in several large areas near 

 Montreal, 



Downy mildew (P. schleideni) occurred in isolated areas and while it 

 alone was not serious greater loss was sustained because it was followed rapidly 

 by Botrytis sp. 



Pink-root or root-rot (F. malli) was present and seriou^ and again the 

 wilted leaved were attacked by Botrytis sp. and the loss aggravated. 



Celery. — Leaf and petiole blight (S. petroselini apii) was common and 

 serious on Paris Golden but Self -blanching was only slightly affected. 



Clovers. — Powdery mildew {E. polygoni) was present to an astonishing 

 extent — fields of clover (T. pratense) looking as though powdered with white 

 flour. 



Mosaic was again comijmon in certain areas. 



Sooty spot {Polythrincium trifolii) was of frequent occurrence but did not 

 cause any perceptible loss. 



Cereals. — Oat smut {U. avence) and barley smut (U. hordei) were present. 



Stinking smut of wheat {T. tritici) was found in isolated cases but was not 

 serious as was also the case with Loose smut {U. tritici). 



Fusarium blight in heads of rye and wheat is apparently commoner than 

 expected and a similar blight in corn was not difficulte locate as a rule. 



Ergot of rye and timothy was note as rather more prevalent than usual. 



Sunflower. — -Samples of sunflower stem suffering from Sclerotinia rot and 

 wilt were sent in from all parts of Quebec indicating its widespread occurrence 

 It has been impossible to ascertain the infection percentage. 



Rust (P. helianthi) was exceedingly common (75%) during September. 



Apple. — Brown rot (S. cinerea) was noted from many sources on Yellow 

 Transparent and Montreal apples. 



Black rot (Physalospora cydonioe), while not common, was frequently 

 found. 



There was a heavy scab infection (V. incequalis) wherever spraying was 

 not done or where orchards were poorly sprayed. 



Two interesting diseases were noted: — Phyllosticta leaf-spot (probably 

 P. solitaria) in one orchard to the extent of 100%. and Bitter rot {G. rufoma- 

 culans) in two orchards on Fameuse apples but only to a slight extent. 



