REPORT OF THE SOCIETY 43 



the Rose Chafer, Macrodaciylus subs'pinosus Fab.; the Black Cherry aphis, 

 Myzus cerasi Fab.; the Strawberry Weevil, Anthonomus signatus Say; the 

 Rose Midsre, Dasi//2e?/ra rhodophaga Coq.; the blackberry Leaf-miner, Matallus 

 hefhiinei MacG., and others, have been worked out and improved methods of 

 control established. IMiich extension work has also been conducted from this 

 laboratory and demonstrations in spraying and dusting under commercial 

 conditions have been given each year in a number of important sections. Mr. 

 Ross has also devoted much time to a systematic study of the family Aphididae. 

 In IMay, 1919, an illustrated bulletin on the Apple Maggot, prepared jointly 

 by Prof. L. Caesar and JNIr. Ross was published by the Ontario Department 

 of Agriculture, At the Vineland laboratorv, Mr. Ross has been assisted by 

 Messrs. C. H. Curran, W. Robinson, W. P. Garlick and J. A. Hall. 



During the absence on military service of Mr. H. F. Hudson, ]Mr. J. R. 

 Gareau was placed in charge of the Strathro}- laborator}', in 1915; his chief 

 investigations related to white grubs. During the summers of 1916 and 1917, 

 Mr. H. G. Crawford w^as employed temporarily at Strathroy to extend these 

 investigations owing to the continued absence of Mr. Hudson. In 1918, 

 the temporary portable laboratory at Strathro}^, was replaced by a permanent 

 structure, Mr. H. F. Hudson continuing in charge. At this laboratory field 

 crop insects have been given special study. White grubs, Lachnosterna spp., 

 as already mentioned, have received particular attention and the habits and life- 

 histories of several important species have been worked out. Much new informa- 

 tion has also been obtained on the Colorado Potato Beetle, Leptuiotarsa decem- 

 lineata Say; the Hessian Fly, PhytopJiaga destructor Say; the Clover Leaf 

 Weevil, Hypera punctata Fab.; the Army Worm, Cirphis unipuncta Haw., 

 etc. Recently Mr. Hudson has also assisted in European Corn Borer studies 

 in western Ontario. In 1914, there was a very severe outbreak of the Army 

 Worm in Ontario, damage to the value of S250,000. being effected to growing 

 crops. Mr. Hudson took a prominent part in the control campaign and, 

 in co-operation with ofF.cials of the Ontario Department of Agriculture, rendered 

 valuable aid in saving considerable acreages of crops. The trench method of 

 control was the one specially demonstrated. An account of this work is pub- 

 lished in Entomological Bulletin No 9, which appeared in 1915. 



Following the discovery of the European Corn Borer, Pyrausta nuhilalis 

 Hbn., in 1920, by Messrs. Keenan and Simpson, a temporary field laboratory 

 was established at Port Stanley in the spring of 1921, Mr. H. G. Crawford, 

 of the Division of Field Crop and Garden insects being placed in charge. The 

 scouting work conducted during the previous 3'ear by the Division of Foreign 

 Pests Suppression in co-operation with the Provincial Department of Agriculture, 

 revealed that seven counties were infested by the borer. In the latter year, 

 biological investigations were incepted and methods of control studied. 

 These studies are still being continued and much success has attended the 

 efforts of our officers. In all of this work we have been closely associated 

 W'ith provincial officials and also with officers of the L'nited States Bureau of 

 Entomolog}'. At the conclusion of the scouting work in 1923, 21 counties 

 in Ontario were known to be infested, the important infestations, remaining, as 

 in 1921, in Elgin and ]\Iiddlesex counties and the Entomological Branch has 

 maintained quarantines on all such counties. The Port Stanley laboratory has 

 served as the headquarters for those engaged in scouting for the corn borer, 

 Mr. W. N. Keenan having the immediate direction of this latter work, assisted 

 by Messrs. L. J. Simpson and C. R. Twinn. In the biological and control 

 investigations, ]\Ir. Crawford has been assisted by Mr. R. H. Painter. 



