June, '22] o'kane: crop protection institute 209 



the past two seasons as a substitute for spraying with a certain degree 

 of success. No objectionable deposit is left on the foliage of the cut 

 flowers because of the frequent syringing, but the ease and rapidity of 

 application makes it possible to keep the leaves continually dusted. 

 Besides, the fungicidal value of the sulfur for the control of leaf-spot 

 and mildew should not be overlooked. The final conclusions on the 

 effectiveness of the dust treatments will probably be reached during 

 the coming season. 



Hydrocyanic Acid Gas 



The use of hydrocyanic acid gas as a fumigant has been mentioned^ as 

 a control measure for the adult stage. Since then the successful use of 

 this gas has been demonstrated on a practical and commercial scale. 

 During the past season a total of approximately 32,000 rose plants were 

 fumigated during the resting or "drying-off' period with a dosage of two 

 ounces sodiimi cyanide per 1000 cu ft. of space, with an exposure of 

 two hours and at temperatures ranging from 66° to 88° F. In some 

 cases the houses received three or four successive fumigations. In 

 these tests it was demonstrated that muslin curtains could be used 

 successfully to confine the gas in any section of an open range of houses. 

 The anticipated burning of the tender growth is a negligible factor be- 

 cause any such injury would be removed in the severe pruning which 

 was mentioned previously. Of the 32,000 plants including 1000 newly 

 set young plants, not one was lost or retarded in growth because of the 

 fumigation. 



President Arthur Gibson takes the chair. 



President Arthur Gibson: This constitutes the fifty-eight annual 

 meeting of the Entomological Society of Ontario, and this organiza- 

 tion is very glad to meet with the American Association of Economic 

 Entomologists today. We appreciate the fact very much that you 

 came to Canada and are holding your meeting in Toronto this year. 



The first paper is by Mr. W. C. O'Kane. 



ONE YEAR OF THE CROP PROTECTION INSTITUTE 



By W. C. O'Kane, Chairman oj the Board of Governors 



One year ago at this time, members of this Association were asked 

 to give their support to a newly organized movement, the Crop Pro- 

 tection Institute. A similar request was made of the men in Plant 



^Loc. cit. 



