REPORT OF THE SOCIETY 51 



Red clover was attacked by disease, the Anthracnose, which destroyed 

 numerous plants in early summer. The leaves withered from the tips, while on 

 their petioles and stems appeared longish, sunken areas on which were made out 

 masses of blunt, crescentic spores. 



On Indian corn the Smut disease was common. 



The fall of the leaves from the red currant was so rapid that by August 30th 

 most of the plants were bare of leaves. Leaf Spot or Anthracnose was the cause 

 here. It forms very abundant small brown spots on both sides of the leaf. 



The European Currant Rust was very common on black currant, where it 

 occurred mixed with the leaf Spot {Septoria). 



Downy Mildew of the grape leaves and fruit did less damage than in some 

 years. The hollyhock Rust caused severe defoliation and early withering, while 

 the silver maples' leaves on the lawns carried the Leaf Blotch on Tar Spot, 

 though the damage was slight. Orchard grass was seriously injured by th6 Mildew. 



On pears, both at La Trappe d'Oka and Ste. Annes, leaves and fruit were 

 spotted and cracked by the Pear Scab or Spot. At the former the dust spray 

 was used, at the latter liquid lime sulphur. 



The red root pigweed provided the White "Rust" (Cystopus) and lamb's 

 quarters the Downy Mildew. 



While the plum disease most widespread was Shothole or Leaf Spot, the fruit 

 of the egg plums was in great part spoiled on the trees by the Brown Rot. The 

 disease in mummied fruit left on the trees in 1917 has withstood the hard 

 winter, and germinates a one hundred per cent crop of spores. A careful search 

 in 1917 failed to yield any of the perfect stage of the disease. 



Of potato diseases little need be said. Early Blight was collected, as well as 

 Late Blight, on August 31st. Following that date the Late Blight progressed 

 rapidly on the cessation of spraying, eventually killing the tops. The wet fall 

 favored the resultant rot in late crop, but a large proportion of the tubers were 

 free, due to the spraying of Bordeaux and lead arsenate given. 



In stored potatoes Fusarium Dry Rot is present, apparently coming after 

 the Late Blight. 



The orange-red pustules of the Rose Rust were collected on cultivated 

 varieties, but the hurt is not serious. This rust does not pass to an alternate 

 host. 



In rye, Ergot was present to a very slight extent, the sclerotia abundantly 

 germinating without the action of frost. 



Soy beans were very considerably affected by a Bacterial Blight of the leaves. 



Of tomato diseases the Blossom End Rot was noted, while the Leaf Spot 

 (Septoria) was common on September 12th and caused some wilting. 



