REPORT OF THE SOCIETY 53 



Anarsia lineateUa Zell., were studied by !Mr. Treherne, as a result of which, as 

 stated in the report of the Dominion Entomologist for 1917 and 1918, ''the 

 spraying of peach and apricot orchards with lime sulphur and arsenate of lead, 

 the pre-blossom spray with lime-sulphur being emphasized, was enforced by 

 the Provincial Department of Agriculture." 



In 1918, the federal provincial headquarters were moved from Agassiz 

 to Vernon. Here Mr. Treherne continued Codling Moth and other important 

 fruit insect studies. In this j^ear, a laboratory was established at Victoria, 

 with Mr. W. Downes in charge. From this laboratory investigations relating 

 particularly to insects affecting strawberries and other small fruits were 

 conducted. The Strawberry root-weevil, Brachyrhinus ovatus Linn, was 

 spscially studied by Mr. Downes and observations on this insect have been 

 continued since. The value of barriers for protecting crops from the weevil 

 has been demonstrated under commercial conditions as explained in Pamphlet 

 No 5, N. S., published in 1922. The Agassiz laboratory was in charge of Mr. 

 A. B. Baird from 1917 to 1920 inclusive. Since then Mr. R. Glendenning has 

 been in charge. 



Studies of several lepidopterous insects affecting the apple were continued 

 by Mr. Treherne in 1919. In this year the provincial and federal activities 

 wers co-ordinated, Mr. Treherne assuming the general direction of the work. 

 Outbreaks of the Roadside Grasshopper, Cammda peUucida Scudd., in the 

 Bridesville-Rock Creek area and in the Chilcoten district; the Lesser Migrato- 

 ry Grasshopper, Melanoplus atlanis Riley, at Celesta; and thg Red-legged 

 Grasshopper, M elanoplus Jemur-ruhrnm DeG. in the Fraser Valley, were inves- 

 tigated. In 1920, special studies were undertaken in the Chilcotin district 

 by Mr. E. R. Buckell of the provincial service, under the direction of Mr. 

 Treherne. Studies of the life-history and control of the Imported Onion 

 Maggot, Hylemyia antiqua Mg., which had been in progress for several years 

 were continued in the Okanagan Valley in 1919, 1920 and 1921 by our offi- 

 cers in association with Mr. M. Ruhmann of the provincial service, and in the 

 latter two years important demonstrations further emphasized the value of the 

 corrosive sublimate remedy for the Cabbage Maggot, Hylemyia hrassicae^ou- 

 che. In 1920, Mr. Treherne continued studies of insects affecting the apple and 

 biological notes were made on Mineola tricolor ella Grt., Rachela briiccatailulst , 

 Epicallima dimidiella Wlshm., Peronea maximana, Busck, and Cacoecia ro- 

 saceana Harr., etc. Experiments in the superheating of refrigerator cars for 

 the destruction of larvae, such as those of the Codling Moth, were also in- 

 cepted with the assistance of the Provincial Horticultural Branch. 



In 1921, Mr. Treherne was promoted to the position of Chief, Division of 

 Field Crop and Garden Insects, with headquarters at Ottawa. During his absen- 

 ce froni Vernon, the work has been carried on largely under his continued direc- 

 tion with ]\Ir. E. P. Venables assisting locally. This latter officer has from 1921 

 to date conducted further work on the life-history and control of apple insects. 

 The Fruit-tree Leaf-roller, Cacoecia argyro^pila Walk., caused noticeable injury 

 in the Okanagan Valley in 1922 and studies of the same were at once begun. 

 These have required the major portion of Mr. Venables' time. In 1920, an 

 important infestation of the Satin Moth of Europe, Stilpnotia salicis Linn., was 

 discovered by Messrs. Tothill and Baird in the city of New Westminster. Mr. 

 R. Glendenning was instructed to make a detailed study of the insect and this 

 occupied most of his time in 1921, since when he has continued to make ob- 

 servations each yeai. A full report on this work is being prepared. The 

 insect has now spread to Vancouver Island. Other msects which have been 



