53 EXPERIMENTAL FARMS 



4 GEORGE V., A. 1914 



ihe tarred-felt paper discs for cabbages and cauliflowers, and hellebore decoction and 

 screening the beds for radishes and onions. It is hoped that the results of the three 

 years' work will be ready shortly for publication. 



INSECTS AFFECTING FRUIT TREES. 



Reference has already been made to the work on fruit insects which has been 

 carried on at the different field, stations. A very important result of the work in 

 Nova Scotia was the discovery by Mr. G. E. Sanders of the presence of living San 

 Jose scale, which had been brought into the province on nursery stock imported from 

 Ontario. Assistance was given the provincial Government in the inspection of 

 nursery stock which had been imported during tbe last three years, and a con- 

 siderable number of trees infested with living scale were found. 



The work on the Indian orchards for the Department of Indian Affairs was con- 

 tinued, and a full account of this will be published in the annual report of that 

 Department. 



INSECTS AFFECTING FOREST AND SHADE TREES. 



The appointment of Mr. J. M. Swaine to have charge of the forest insect investi- 

 gations has permitted of the very considerable extension of the work in this most 

 important direction. 'During the year he has visited the Riding Mountain Forest 

 Reserve, Man., Algonquin Park, Ont., and one or two districts in Quebec and, as a 

 result, has collected a large amount of material and information which will be of 

 great service in connection with future work. 



A shipment was obtained of the cocoons of the Large Larch Sawfly infested with 

 the useful parasite (Mesoleius tenthredinis) from the English Lake district and these 

 were distributed by Mr. Swaine in Manitoba in the Riding Mountain Reserve. It 

 is hoped to receive a further supply of parasitized cocoons from England this spring. 



INSECTS AFFECTING DOMESTIC ANIMALS AND MAN. 



An investigation was made into the distribution of the Rocky Mountain Spotted 

 Fever Tick (Dermacentor venustus) in western Canada. A large number of ticks 

 belonging to several species were received, and it was found that D. venustus was 

 fairly common in southern British Columbia and also occurred in southern Alberta. 

 Observations were also made on the life history of this species. 



On account of the discovery by Drs. Sheppard, Rosenaw, Brues and Anderson 

 that the Stable Fly (Stomaxys calcitrans) could transmit the virus of Poliomyelitis 

 (infantile paralysis), investigations on the life-history and habits of this insect were 

 resinned and some interesting and valuable data have already been obtained. The 

 campaign against the hou^e fly was continu ] it is gratifying to record the 



appreciation with which efforts in this direction are met. 



INSECTS AFFECTING GARDEN AND GREENHOUSE. 



Experiments have been carried out and are still in progress on the control of 

 White flies (Aleyrodcs \ by fumigation, and on the control of wood lice, or sowbugs, 

 of which are seriou.- 1 . pests in some greenhouses. 



APICULTURE. 



In view of the further extension of this work, consequent upon the appointment 



Mr. F. W. L. Sladen as Assistant Entomologist to take charge, a beginning was 



ide by the importation of pure Italian queens from Bologna, Italy. It is planned 



