REPORT OF THE SOCIETY 77 



Case-making clothes-moth. — (Tinea pellionella L.) 



This household pest is common in many places in Quebec and has caused 

 Tery serious losses in and injuries to clothing and other household goods. It 

 is much more serious than is generaly reahzed. 



NOTES ON PLANT DISEASES IN QUEBEC DISTRICT FOR 1924. 



Omer Caron, Botanist, Dept. of Agriculture. 

 Cereals. 



The seed disinfection campaign started a few years ago has brought about 

 rery satisfactory results. We have no complete and accurate statistics as to 

 this but the dealers give us the information that they are selling more and more 

 formalin for this purpose. Although we firmly believe in the efficiency of the 

 copper carbonate treatment for oat disinfection we have not yet tried to intro- 

 duce this method since it is always dangerous to invite the farmers to change 

 their methods too often. With us the formalin dry treatment gives good results. 

 Formalin is a cheap material and when the directions for its use are scrupulously 

 adhered to it does not materially affect the germinative power and the strength 

 of the seed. 



Potatoes. 



During the season of 1924 many complaints have been received from 

 Eastern Quebec regarding the Black leg disease. On account of the high per- 

 centage of said disease in fields some producers have been refused certification 

 for their tubers. 



It sometimes happened that the damage attributed to Black leg was rather 

 caused by the Sclerotium disease of potatoes. We have made cultures on 

 potato-dextrose-agar with material kindly supplied by Mr. H. N. Racicot and 

 we have thus obtained an organism identical with the one discovered by Mr. 

 O. W. Lachaine in New-Brunswick a few years ago. It may then be stated 

 that the Sclerotial disease is now established in the Province of Quebec. 



Small fruits. 



We must mention here a strawberry disease which seems of importance for 

 it is generally widespread around Quebec city. It is a sort of crown-rot. Follow- 

 ing a dry spell the leaves turn yellow, wrinkle, wilt and the plant dies within a 

 couple of days. When pulled away it is generally observed that the rootlets 

 are rotten and the interior of the crown is brownish. The Senator Dunlap is 

 the most seriously affected variet^^ Though rather common in the United 

 States this disease is not considered a serious pest , probably because it never 

 causes as much damage with our neighbours as with us, where the percentage 



