1920 ENTOMOLOGICAL SOCIETY. IT 



equally good results. The two applications of spray may be made in cases of 

 severe infestation. This insect is known to attack prunes, plums, peaches, apricots^ 

 and cherries, and where these fruits are seriously attacked the same procedure for 

 control, as outlined above, may be followed. 



Certain studies were undertaken at Vernon this year to breed to maturity 

 the various " worms " affecting fruit. This work was carried out to determine with 

 accuracy the species present in the fruit orchards and to differentiate between the 

 larvae of the various species for the purpose of assisting in diagnosing outbreaks 

 of Codling Moth. The following species occur: Tmetocera ocellana, Argyroploce 

 consanguiniana, Cacoecia rosacmna, Mineola tricolorella, and Laspeyresia prumvora. 



Insect distributors of fire blight were also the subject of study. Many insects 

 received attention in this connection and while some were incriminated as carriers 

 of both summer and winter blight, it is not believed that their control will either 

 eliminate the disease or control it to the extent expected by many growers. 



The Strawberry Eoot Weevil, Otiorhynchus ovatus, is still being subjected tO' 

 investigation, the main line of work being a demonstration in the principles of 

 crop of rotation. A section of land has been engaged for a period of six years to 

 put into practice the remedies for this weevil which we believe may be successfully 

 held in control by cultural methods. Mr. W. Downes, assistant in charge of this, 

 work, has recently shown that the weevils are parthenogenetic and 'that certain 

 overwintering females may oviposit in the early spring months. 



The chief small-fruit insects, with the exception of the Strawberry Root Weevil,, 

 which is the most serious, are the following : Bemhecia marginata, Phorhia ruhiv&raj. 

 Aristotelia fragariae, Synanthedon rutilans, Epochra canadensis, and an Empoasca 

 of the Loganberry. It is hoped that all these insects will be studied closely during 

 the next few years. With Epochra canadensis we have been unable, thus far, to 

 prove any value from the poisoned bait spray and are still recommending growers, 

 to rely on cultivation and the use of chickens to rid themselves of this pest. 



Among the vegetable insects the Cabbage Eoot Maggot and the Onion Maggot 

 were each the subject of considerable study. The bulk of the work against the 

 Cabbage Root Maggot is recounted on another page of these proceedings. The 

 work against the Onion Maggot has not resulted, as yet, in our being able to offer- 

 definite recommendations for control under field conditions as they pertain to the 

 Okanagan Valley. Our efforts to test the value of the poisoned bait spray have 

 not apparently been rewarded with success. Our inclinations lead us to believe 

 that late thinning and the use of a spring trap crop have considerable value, and 

 in this belief our growers are recommended, at present, to plant a few rows of 

 cull onions, 3-4 inches deep in the soil, in the early spring months, allowing the 

 onions to sprout and thus act as a trap crop for the first generation of the fly. 

 The work with the poisoned bait spray, which is, according to report, giving very 

 good results in Eastern Canada and in the Eastern United States, is being con- 

 tinued. Consequently it is hoped that our recommendations will assume a more 

 definite state in a few years' time. 



Among the insects affecting grain and range crops, the locusts situation 

 received considerable attention during the past year. The main species involved 

 were Comnula. pellucida, Melanoplus atlanis and M. femur-ruhrum. The paper 

 in this number of the Proceedings by Mr. E. R. Buckell, on some ecological and 

 life history notes of locusts, covers in part, the work accomplished. 



Spraying investigations that are being carried on, at present, in the Province, 

 are being maintained by the Provincial Horticultural Division. Their main in- 



