44 PROTECTION OF PL ANTS-^1923-24 



A temporary Corn Borer parasite laboratory was established at St, 

 Thomas in 1923, with Mr. A. B. Baird in charge. In May of that year, a 

 small breeding stock of the European parasite, Hahrohracon hrevicornis Wesm., 

 was presented to us by the United States Bureau of Entomology. During 

 the season fairly strong colonies of the parasite reared in the laboratory were 

 liberated in important corn borer infested fields, over 600,000 individuals of 

 the parasite being released altogether. Several native parasites which attacked 

 the corn borer have also been under observation. In this work, Mr. Baird 

 has been assisted by Mr. H. G. Dyce. 



In 1922, a plant inspection office was established in the Customs Exami- 

 ning Warehouse, Toronto, Mr. W. A. Fowler in charge, and with the coming 

 into effect of the revised regulations under the Destructive Insect and Pest 

 Act, in Sept,. 1923, the fumigation stations at Niagara Falls and Wind- 

 sor, were closed, but the station at Montrose was retained. In the same year, 

 an inspection office was opened at Niagara Falls, Mr. R. W. Sheppard in charge, 

 and an inspection service established at Windsor, Ont., Mr. C. S. Thompson 

 in charge. 



Provincial 



The Provincial Entomologist, Prof. L. Caesar, has continued, since 1914, 

 to dii'ect the provincial entomological work, and his investigations have added 

 very materially to the knowledge of several of our important insect pests. 



Bulletins on such insects as the Cherr}^ Fruit Fly, Rhagoletis faiista O. S., 

 the Apple Maggot, Rhagoletis pomonella Walsh., ancl the Cabbage Maggot, 

 Hylemyia hrassicae Bouche, have been prepared by Prof. Caesar and these 

 present original data both as regards the biology of the insects and their 

 control. In addition to these publications the Department has continued to 

 include in its Annual Reports notes on entomological work conducted under 

 the direction of Prof. Caesar. Mr. A. H. McLennan, as the Ontario Vegetable 

 Expert, conducted educational work, particularly in regard to the control of 

 the Cabbage Maggot. 



During the summer months, inspectors of the Department visit nurseries 

 in Ontario, particularly in districts where the San Jose Scale is present. In 

 1920, 1921 and 1922 provincial inspectors also co-operated with the Dominion 

 Entomological Branch in the Corn Borer scouting work in the Province of 

 Ontario. For a number of years, too, the Department has assisted the federal 

 Department in the inspection of imported nursery stock. 



The Department continues to publish the Annual Reports of the Ento- 

 mological Society of Ontario and also to grant to the Society, annually, the 

 sum of $1,000. 



Since the appearance of the European Corn Borer, in western Ontario, 

 a laboratory has been established near Port Stanley, Ont., with Mr. G. J. 

 Spencer in charge. At this laboratory the life-history of the Corn Borer and 

 means of control have been studied. The whole problem in general has been 

 investigated in close co-operation with the officials of the Dominion Entomo- 

 logical Branch and as a result of this co-operation a bulletin on the corn borer 

 recently appeared under the authorship of IMessrs. G. J. Spencer and H. G. 

 Crawford. 



Ontario Agricultural College 



At the Ontario Agricultural College, the staff of the Entomological 

 Department in 1914 consisted of Dr. C. J. S. Bethune, Professor of Entomo- 



