. Annual report. Entomological Society of Ontario; Insect pests; Insects. ENTOMOLOGICAL SOCIETY 51 southern Ontario. More important is the increased infestation of fall web- worm (Hyphantria textor Harv.) Serious damage occurred in the St. Lawrence Valley from St. Lambert to Valleyfield, and moderate infesta- , tion as far as Belleville; this species was abundant also in southern Mani- toba and in parts of the Niagara Fig. 3.—Degree of infestation of forest tent-caterpillar in 1938. The forest tent caterpillar (Malacosoma disstria Hbn.) appears to be at the end of an infestation pe
. Annual report. Entomological Society of Ontario; Insect pests; Insects. ENTOMOLOGICAL SOCIETY 51 southern Ontario. More important is the increased infestation of fall web- worm (Hyphantria textor Harv.) Serious damage occurred in the St. Lawrence Valley from St. Lambert to Valleyfield, and moderate infesta- , tion as far as Belleville; this species was abundant also in southern Mani- toba and in parts of the Niagara Fig. 3.—Degree of infestation of forest tent-caterpillar in 1938. The forest tent caterpillar (Malacosoma disstria Hbn.) appears to be at the end of an infestation period, being on the wane in the original cent- res and severe in patches in the outlying areas (Fig. 3). Such is certainly the case in Ontario, the two main infestations of which are discussed else- where. There is a heavy infestation along the Saskatchewan River from Nipawin 25 miles downstream. It is interesting that here the large ground- beetle Carabus taedatus Fab. is reported as a valuable control factor. A patchy infestation in northern Manitoba extends from the Duck Moun- tains north to The Pas. Southern Manitoba has severe infestations in the regions of Portage la Prairie, the Red River, and the Pembina Valley. The Quebec infestations of forest tent caterpillar at Megantic and Levis continue to be severe though parasites are abundant; a new outbreak is reported from Rawdon. One point in Prince Edward Island represents the only serious infestation reported from the Maritimes. It is interesting to note that the western tent caterpillar (Malacosoma pluvialis Dyar) was a common admixture even as far east as the Ottawa Valley and Abitibi County, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
