File:Annual report (1938) (18243213259).jpg

Title: Annual report
Identifier: annualreport19381943ento (find matches)
Year: 1872 (1870s)
Authors: Entomological Society of Ontario; Ontario. Dept. of Agriculture
Subjects: Entomological Society of Ontario; Insect pests; Insects
Publisher: Toronto, The Society
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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52 THE REPORT OF THE
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Fig. 4.—Degree of infestation of spruce budworm and Jack pine budworm in 1938. The jack pine budworm (Cacoecia fumiferana Clem.) has caused a serious and widespread infestation west of Lake Superior, and is appar- ently spreading eastwards (Fig. 4). Whereas the intensity in the greater part of Manitoba is light, serious concentrations are present in the Sandi- lands reserve, and in the Kenora, Rainy River and western Thunder Bay districts of Ontario. Parasitism in the areas of older infestations in south- east Manitoba was as high as 79 per cent., decreasing regularly as one ap- proaches the areas of newer infestation to 25 per cent, in the Port Arthur district. During the past few years, the spruce budworm (Cacoecia fumiferana Clem.) has built up a very heavy population on spruce and balsam in the Algoma district of Ontario. This infestation extends from the Mississagi River northeast to Foleyet, covering a pear-shaped area 100 miles long and 50 miles wide. It is probable that the balsam and most of the spruce, at- tacked in 1937 and 1938, will be killed. A light infestation is reported from Westbrook, just west of Kingston. Another outbreak which has been developing for the last few years is that of the hemlock looper (Ellopia fiscellaria Gn.) in the area between Parry Sound and Lake Muskoka, where a considerable amount of hem- lock has been destroyed. There is also a moderate infestation at Owen Sound, and the looper is common on spruce, balsam and white pine through- out the Parry Sound forest inspectorate. It may be emphasized that the Forest Insect Survey has two functions; firstly, to gather data on the distribution, biology and parasitism of all species encountered, and secondly, to record, correlate and distribute in- formation on infestations reported from any point in the Dominion. The steady growth of this project shows that it answers a real need. The author wishes to acknowledge the assistance of Mr. H. Raizenne in preparing the illustrations. References Glenn, P. A., 1922. Bull. 111. Nat. Hist. Survey 14:219. Reeks, W. A., 1938. Ann. Rep. Ent. Soc. Ont. 69.

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