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Against Phorhia hrassicae (cabbage root maggot) promising results 

 were obtained with bichloride of mercury. Cutworms were most 

 abundant in western Canada during 1917 and 1918, Eiixoa ochrogaster 

 and Feltia venerabilis doing considerable damage in gardens. Wheat 

 and oats were attacked by Sidemia devastatrix (glassy cutworm) 

 and cabbages and turnips by Agrotis ypsilon. Cephus cincius (western 

 wheat-stem sawfly) caused extensive damage to wheat in Manitoba 

 and Saskatchewan. Investigations on Oscinid flies affecting western 

 grain and grasses have been continued, and much valuable information 

 has been secured regarding the life-histories and bionomics of several 

 important species. 



Other insects recorded are Loxostege stidicalis (sugar-beet webworm) ; 

 Macrosiphum granarium (grain aphis) ; Phorbia fusciceps (seed-corn 

 maggot), causing injury to beans and seed corn in eastern Canada ; 

 Itonida tritici (wheat midge) ; Harmolita [Isosoma) tritici (wheat 

 joint worm) ; wireworms injurious to potatoes ; Entomoscelis adonidis, 

 on turnips, cabbages, etc. ; Epitrix cucnmeris (potato flea-beetle), 

 on potatoes and tomatos, particularly in New Brunswick ; Macrobasis 

 unicolor (grey blister-beetle), on potatoes ; Perrisia {Dasyneitra) legu- 

 minicola (clover-seed midge), seriously affecting clover seed production 

 in Ontario ; the alfalfa-seed Chalcid [Bruchophagus funehris], injuring 

 50 per cent, of the crop in certain localities of British Columbia ; and 

 Neocerata [Dasyneura) rhodophaga (rose midge), very destructive to 

 outdoor roses in Ontario. 



The insects aflecting fruit crops included : — - A nthonomns quadrigibbus 

 (apple curculio), against which lime-sulphur and calcium arsenate 

 sprays proved effective ; Rhagoletis pomonella (apple maggot) ; 

 Schizura concinna (red-humped apple caterpillar) ; Hyphantria ciinea ; 

 Conotrachelus nenuphar ; Myzus cerasi (black cherry aphis), of which 

 red pepper grass [Lepidiiim apatelum) appears to be the alternative 

 food- plant ; Psylla pyricola (pear psylla), the life-history of which has 

 been further studied ; Polychrosis viteana (grape-vine moth), which is 

 of minor importance under Ontario conditions ; Anarsia lineatella, 

 the most serious pest of peaches in British Columbia, the life-history 

 of which received special attention ; Aristotelia fragariae ; and 

 Aegeria {Synanthedon) rutilans. 



Insects affecting forest and shade trees included Tortrix ( Harmaloga) 

 fiimiferana (spruce budworm) ; Pityokteines sparsus. Lee, and Pissodes 

 dubius, Rand., associated with balsam disease. Experimental work on 

 the control of Agrilus anxius (bronze birch borer), Cyllenc robiniae, 

 KaliosyspJiinga doJirni, Argyresthia thuiella, Diploiaxis spp., Lophyrus 

 lecontei, and Phylloryder [Lithocolletis) sp., affecting oaks, was also 

 undertaken. The life-histories of Diapheromera femorata on oak and 

 basswood and Prionoxystus macmurtrei on oak were also investigated. 

 Dryocoeies confusus (balsam bark-beetle) and Pissodes strobi (white 

 pine weevil) caused serious injury during 1917 and 1918, as did 

 Tortrix conflictana on poplars and Hemerocampa vetusta var. gulosa, 

 on Douglas fir. Argyroploce [Olethreutes) duplex was less destructive 

 than in previous years. 



Owing to the reported discovery of certain mites in Canadian grain 

 in England, a study of the conditions affecting grain from the time of 

 harvest until loaded at the seaboard was undertaken, and the results 

 show that under normal condition^ the infestation of grain does not 

 take place in Canada to a noticeable extent. Ephestia kiihmella was 

 found sparingly in accumulations of wheat in empty grain boats, and 



(2290) N 



