84 



Compsilura concinnata have been reared and were forwarded in July 

 for colonisation at various points in eastern Canada. The total 

 number of parasites imported up to date are : Apanteles lacteicolor, 

 67,500 ; C. concinnata, 30,725 ; Calosoma sijcopJianta, 4,200. 



Investigations respecting the natural factors controlling or tending 

 to control the abmidance of certain highly injurious insects revealed 

 the fact that in the control of Hyphantria textor (fall webworm) the 

 red-eyed vireo, Vireosylva olivacea, L., is the most important factor, 

 about 40 per cent, of the larvae being destroyed by this bird at five 

 observation points. The most useful enemy of Lepidosaphes uhni 

 (oyster-shell scale) was foimd to be a j)redaceous mite, Hemisarcoptes 

 mains. Woodpeckers destroyed most of the cocoons of Samia cecropia 

 (emperor moth). The problem of the natural factors controlling the 

 Tortricid, Cacoecia (Archips) cerasivorana, in a region where the insect 

 does not appear to increase in numbers, is being investigated. The 

 introduction into Canada of Mesoleius tenthredinis for the control of 

 Lygaeonematus (Nemaius) erichsoni (larch sawfly) has already been 

 described [see this Review, Ser. A, v, p. 347]. 



Insects affecting grain and field crops have been under investigation ; 

 the life-histories of Lachnosterna gibbosa, L.fusca, L. dubia and L. rvgosa 

 (all species occurring in Ontario), and of L. rugosa, L. dubia, L. grandis 

 and L. nitida in Manitoba and Saskatchewan have been studied, and 

 the data collected wall be published. Cutworms were the cause of 

 serious damage, particularly Euxoa ochrogaster in Manitoba and eastern 

 Canada and E. exceUens in British Columbia, some of the latter being 

 destroyed by the fungus, SorosporeUa uvella. Poisoned bran mixture 

 was found very useful for controlHng these. ChoHophila {Phorbia) 

 brassicae is apparently increasing in numbers and destructiveness 

 throughout Canada ; in experiments for the control of Hylemyia 

 antiqua {Phorbia cepanmi) sodium arsenite gave promising results. 

 A severe outbreak of Cephus sp. (western wheat-stem sawfly) occurred 

 in Manitoba and Saskatchewan. In the same provinces Mayetiola 

 destructor (Hessian fly) is being investigated. Ceramica picta (zebra 

 caterpillar) stripped the foliage of turnips, cabbage and kale in Ontario 

 and the Maritime Provinces. Cabbages and turnips were also attacked 

 by a new Tortricid pest, Tortrix wahlbomiana var. vigaureana 

 {oleraceana). 



Other destructive insects were Bruchus pisorum (pea weevil), 

 Pemphigus betae (beet aphis) and Psila rosae (carrot rust fly). Thrips 

 iabaci (onion thrips) was largely controlled by the predaceous bug," 

 Triphleps tristicolor. Greenhouse pests include Callojnstria floridensis 

 (Florida fern caterpillar), Dasyneura rhodophaga (rose midge), Eumerus 

 strigatus (narcissus bulb fly), Diarthronomyiahypogaea (chrysanthemum 

 midge) and Tarsone?7ius jxillidus (cyclamen mite). 



In eastern Canada much attention has been given to the control of 

 insects af?ecting apple [see this Review, Ser. A, v, pp. 343-346 

 and 549]. In Quebec sprays for Anthonomus quadrigibbus (apple 

 curcuUo) have been tested [see this Review, Ser. A, iv, p. 480]. The 

 mite, Tetranychus pilosus, was abundant on plums and apples and the 

 silver-leaf mite, Phyllocop)tes schlechtendali, on peaches in the Niagara 

 District. In British Columbia the life-history and control of 

 Taeniothrips inconsequens {pyri) (pear thrips) has been studied [see 

 this Review, Ser. A,^v, pp. 70 and 117]. Rhagoletis pomonella (apple 



