549 



trees ; Chalepus rubra (bass-wood leaf-miner) on linden ; Thrips 

 tabaci (onion thrips) effectively checked by a predaceous bug, Tri- 

 phleps tristicolor ; Aeoloihrips fasciatus ; Leptinotarsa decemlineata 

 (potato beetle) ; and Bryobia jyratensis (clover mite). 



Fyles (T. W.). The Naturalist in the City.— 47th Ann. Rept. 

 Entom. Soc. Ontario for 1916, Toronto, 1917, pp. 28-31. [Received 

 12th October 1917.] 



Injurv to a branch of red maple by the sawfly, Treniex columba, L., 

 is recorded, resulting in the limb snapping off at the point attached. A 

 spruce of fifteen inches diameter at the base, broke off short owing 

 to having been pierced in every direction by the mines of the Longi- 

 corn, Monochamus {Monokammus) scutellatiis. Say. 



Caesar (L.). Dusting Fruit Trees and Grapes for the Control of 

 Diseases and Biting Insects. — 47th Ann. Rep. Entom. Soc. Ontario 

 for 1916, Toroyito, 1917. pp. 31-43, 2 figs. [Received 12th October 

 1917.] 



Further tests with dust sprays have been carried out in districts 

 heavily infested with codling moth \Cydia. pomonella]. The dust 

 used was a mixture of very finely ground sulphur (85 per cent.) and 

 arsenate of lead powder (15 per cent.) ; in cases where biting insects 

 were absent, as on grapes, the lead arsenate was omitted. Some 

 operators used sulphur mixed with finely ground limestone. The 

 powder was applied by means of a 2|- horse-power gasoline engine, 

 through a 6 ft. length of three-inch rubber tubing, the hopper con- 

 taining about 100 lb. dust. Dusting may be done with safety either 

 when the foliage is dry or moist, but should be done on a calm day 

 to prevent waste ; if there is any wind, spraying should be at right 

 angles to its direction. 



The advantages of the dusting method are its quickness and, at the 

 hands of a skilful operator, its cheapness for treating large trees, 

 though in the case of small trees liquid spraying with lime-sulphur 

 and arsenate of lead costs less. 



The results showed that the method will control codhng moth 

 satisfactorily, but its great drawback is that there has not yet been 

 found a really satisfactory powder for controlhng scales or other 

 sucking insects. Finely ground soluble-sulphur mixed with hydrated 

 lime gave fairly good results against San Jose scale [Aspidiotus perni- 

 ciosus], but was unsatisfactory in practice, o^^^ng to its absorbing 

 moisture and hardening, thus clogging the spray machine. Another 

 defect is that the dust does not adhere to glossy fruits and foliage 

 as well as lime-sulphur solution. This method should however prove 

 advantageous in the control of the elm-leaf beetle [Galerucella luteola,], 

 the tussock moth [Hemerocampa], tent caterpillar [Malacosoma] and 

 many other biting insects, as well as leaf diseases on shade trees. 



Ross (W. A.). General Notes on Aphides which occur on Apple Trees. 

 — 47tli Ann. Rept. Entom. Soc. Ontario for 1916, Toronto, 1917, 

 pp. 43-49. [Received 12th October 1917.] 



This paper gives brief notes on ten species of Aphids that have 

 been taken on the apple in Ontario. Four of these : Aphis pomi 



