564 



owing to the mild winter, was able to winter on the trees, and therefore 

 infestation was severe in all sections of the interior. Annr aphis persicae- 

 niger (black peach aphis) has recently appeared in Southern Okanagan, 

 and no satisfactory remedy has yet been found for it. Aegeria exitiosa 

 (peach-crown borer) was troublesome on peach and prune. Lepidosaphes 

 iilmi (oyster-shell scale) was difficult to control in 1921 owing to the 

 unusually long hatching period. The cutworm, Scotogramma {Mamestra) 

 trifolii, seriously damaged vegetable crops and lucerne in various 

 districts and in Kootenay is said to have attacked apple fruit. 



Hemerocampa pseudotsugata (Douglas fir tussock moth) [R.A.E., 

 A, ix, 321] has now spread through several sections of the interior. 

 Sitodiplosis (Thecodiplosis) mosellana (wheat midge) caused considerable 

 local damage. The larvae of the bud moth, Eucosma (Tmetocera) 

 ocellana, and of the leaf- roller, Tortrix (Archips) rosaceana, were more 

 abundant than usual. 



Experiments in the control of Hylemyia antiqua (onion maggot) 

 [R.A.E., A, ix, 582] have now been conducted over three years, 

 and the following conclusions have been reached. Poison baits, 

 though causing a high mortality, do not materially prevent oviposition. 

 The trap crops will take the major portion of oviposition of the first 

 generation during the most critical period of growth of the seedlings. 

 There is a partial third generation of the fly in the Okanagan Valley. 

 Thinning should be delayed until 14th-16th June, when all trap 

 onions must be removed and destroyed. Thinning should then be 

 completed as soon as possible, all infested seedlings being pulled up 

 and destroyed. A certain amount of oviposition is sure to occur after 

 removal of the traps ; this will chiefly be on previously injured or 

 weak plants, which should be allowed to remain to act as traps for the 

 rest of the season. From the middle of July onwards the pest is held 

 in check by natural enemies, among which is a Cynipid parasite 

 tentatively identified as Cothonaspis gillettei, Wash. The treatment 

 outlined above is not expensive and has proved successful under 

 commercial conditions. 



A heavy infestation of cabbages by Pieris rapae in early June was 

 completely checked by the use of a dust mixture containing 1 lb. lead 

 arsenate to 20 lb. hydrated lime. Several applications were made 

 before the crop was harvested. 



Evans (H. H.). Oyster Shell Scale. — Agric. Jl. Victoria, B.C., vii, 

 no. 7, September 1922, pp. 154-155, 1 fig. 



As a result of the unsatisfactory results obtained against Lepidosaphes 

 uhni, L. (oyster-shell scale) with lime-sulphur sprays, experiments 

 have been conducted with ordinary commercial fuel-oil and whale-oil 

 soap in the dilution 1:10, and with the miscible oil preparation known 

 as dormoil in the same dilution. The conclusion has been reached that 

 one of these can be used with advantage in the spring months, 

 while the trees are still dormant, but the possibility of injury to the 

 trees must be borne in mind, and it would be well to extend the tests 

 before definite recommendations are made. 



Veitch (R.). The White Grubs of the Sugar-cane Soils of Fiji. — 



Colonial Sugar Refining Co., Ltd., Sydney, Agric. Rept., no. 5, 

 March 1922, 14 pp., 4 plates. [Received Isth September 1922.] 



The bulk of the information contained in this paper has been 

 previously noticed [R.A.E., A, viii, 25]. 



