541 



Riviere (G.). Le Psylle du Poirier dans la Region Parisienne.— //. 



Soc. Nat. Hortic. France, Paris, xxii, August 1921, p. 286. 



An unusual abundance of Psylla pyri is recorded from the Paris 

 region, and the necessity for preventing its further spread is emphasised. 



Gibson (A.). Common Garden Insects and their Control. — Canada 

 Dept. Agric, Ent. Branch, Ottaioa, Circ. 9, Revised April 1921, 

 20 pp., 1 fig. [Received 20th September 1921.] 



This is a revision of a paper already noticed \R. A.E., A, v, 337]. 



Griddle (N.) & Mitchener (A. V.). The Control of Grasshoppers. — 



Canada Dept. Agric, Ent. Branch, Ottawa, Crop Protection I^eaflet 



14, March 1921, 4 pp., 2 figs. [Received 20th September 1921.] 



Efficient organisation and general co-operation are essential to the 

 success of campaigns for the destruction of grasshoppers. The 

 establishment of mixing centres equipped with the Manitoba poison 

 bait mixer [R.A.E., A, ix, 259] where farmers may secure read}^ 

 mixed bait would greatly facilitate operations. The grasshoppers to 

 be controlled in the Prairie Provinces are Melanoplus atlantis and 

 Camniila pdhicida [cf. R.A.E., A, viii, 316; ix, 126]. 



Seamans (H. L.) & Strickland (E. H.). The Pale Western 

 Cutworm. — Canada Dept. Agric, Ent. Branch, Ottawa, Crop 

 Protection Leaflet 15, June 1921, 3 pp., 3 figs. [Received 20th 

 September 1921.] 



A brief outline of the life-history and habits of Porosagrotis orthogonia 

 (pale western cutworm) is given, and recommendations are made for 

 combating. this moth [R.A.E., A, iv, 346; viii, 192]. Special stress 

 is laid on the importance of cleaning up fields by 31st July and leaving 

 them entirely alone until 15th September. Any weeds that may 

 germinate between these dates will not reach the flowering stage in 

 time to attract the moths, and any light shower will tend to cake 

 tlie surface of the soil and seal the cracks, thus destroying hiding 

 places for the moths and making the field unattractive for oviposition. 



Hopping (R.). The Control of Bark-beetle Outbreaks in British 

 Columbia. — Canada Dept. Agric, Ent. Branch, Oitaiva, Circ. 



15, June 1921, 15 pp., 13 figs. [Received 20th September 

 1921.] 



Various bark-beetles cause considerable damage in British Columbia 

 to nearly all coniferous trees, and especially to lodge-pole {Pimis 

 contorta) and yellow pine (P. ponderosa) in the southern part of the 

 interior. A brief account is given of the damage done by each species, 

 arranged under the trees attacked. vSuggestions are also made for 

 controlling outbreaks [cf. R.A.E., A, viii, 489]. The species dealt 

 with are : — Dendroctonus monticolae, Hopk. (mountain pine beetle), 

 on yellow pine, lodge-pole pine and western white pine (P. monticola) ; 

 D. brevicomis, Lee, on yellow pine ; D. psendotsugae, Hopk., on 

 Douglas fir {Psendotsuga taxi folia) ; D. obesiis, Mannh., on Sitka 

 spruce {Picea sitchensts) ; D. borealis, Hopk. (northern spruce beetle) 

 on Engelmann's spruce (P. engelnianni) ; and D. valens (red turpentine 

 beetle) found in the bases of all pines. 



