Forest Lepidoptera of Southern Ontario and Their Parasites Received and Reared at the Ottawa Forest Insect Survey Laboratory from 1937 to 1948.Henri Raizenne

1954 ◽  
Vol 29 (4) ◽  
pp. 383-383
Author(s):  
Ralph W. Macy
1966 ◽  
Vol 98 (3) ◽  
pp. 262-262
Author(s):  
O. H. Lindquist

A larva with an extra proleg was collected near Orangeville in southern Ontario by A. A. Harnden, of the Forest Insect Survey, on 13 August 1964. The species was Anchylopera burgessiana Zeller, a leaf folder on red oak, Quercus rubra L.An abnormal larva reported previously (Lindquist 1964) had twin anal prolegs on a common base. The specimen reported here has a complete supernumerary proleg situated between the normal anal pair (Fig. 1). The extra appendage has 27 crotchets arranged in a complete circle. It resembles the prolegs on abdominal segments 3–6, although these bear about 42 crotchets also arranged in a circle. Crotchets on the normal anal pair of prolegs number 25 and 29.


1961 ◽  
Vol 93 (5) ◽  
pp. 403-405
Author(s):  
W. Y. Watson ◽  
W. L. Sippell

Although many possible vectors of the Dutch elm disease, Ceratocystis ulmi (Buism.) C. Moreau, have been listed by Collins et al. (1936) and others, only two, Scolytus multistriatus (Marsh.), the European elm bark beetle, and Hylurgopinus rufipes (Eichh.), the native elm bark beetle, are known to transmit the disease with any regularity. In this capacity alone thcse two species of beetles are important pests of elm. The persistent spread of the Dutch elm disease in southern Ontario (Hord and Quirke, 1955) made it imperative that adequate surveys be maintained to indicate yearly changes in the occurrence of the introduced vector, and to ascertain more precisely the distribution of the native vector relative to the distribution of elm in Ontario. Consequently the Forest Insect Survey of the Forest Insect Laboratory, Sault Ste. Marie, intensified its elm bark beetle program in 1956, and from then to 1959, 138 positive samples of these two scolytid beetles have been received. An analvsis of these records and their relationihip to the current incidence of the Dutch elm disease in Ontario are presented in this paper.


1959 ◽  
Vol 91 (8) ◽  
pp. 496-500 ◽  
Author(s):  
W. G. H. Ives ◽  
R. M. Prentice

The Forest Insect Survey at the Forest Biology Laboratory, Winnipeg, has been compiling records for a number of years on the percentage of cocoons of the larch sawfly, Pristiphora erichsonii (Htg.), parasitized by the tachinid Bessa harveyi Tnsd. Sawfly cocoons were collected each fall from the soil in infested stands, and those containing living larvae were dissected to determine the percentage of parasitism by B. harveyi. These estimates have been used to provide an index of parasitism (Lejeune and Hildahl, 1954), but are of limited value for a number of reasons: (1) estimates can be expressed only as percentage of sound cocoons parasitized; (2) total parasitism cannot be estimated because a portion of the parasites emerge from the cocoons before collection; and (3) estimates of parasitism may not be representative of the stand because there is a tendency to collect cocoons where they are easiest to find; hence all the cocoons in a collection may be from one or two small areas. If the proportion of cocoons containing B. harveyi varies within a stand such collections may give unreliable estimates of parasitism.


1962 ◽  
Vol 94 (10) ◽  
pp. 1103-1107 ◽  
Author(s):  
C. E. Brown

The Bruce spanworrn, Operophtera bruceata (Hulst), is most common in the mid latitudes of the North American Continent; in Canada it occurs from Newfoundland to the interior of British Columbia (Prentice, In Press) and has been reported from Vermont and Wisconsin in the United States (Craighead, 1950.) Three outbreaks of this insect have been recorded in Alberta. The first occurred in 1903 (de Gryse, 1925) and was apparently of short duration. The second reported by Wolley Dod (1913) occurred in 1913 and denuded hundreds of acres of aspen poplar. Heavy defoliation in the third outbreak became evident in 1957 (Brown, 1957) but an examination of Forest Insect Survey records revealed that population buildup began about 1951. The outbreak continued to expand until 1958 and began to decline in 1959; by 1961 populations were again low except for one or two isolated areas where moderate to low populations persisted. At the peak of the outbreak in 1958 approximately 50,000 square miies were moderately or heavily infested and many more lightly infested.


1980 ◽  
Vol 58 (3) ◽  
pp. 394-399 ◽  
Author(s):  
John M. Dean ◽  
Robert E. Ricklefs

Abundance, variability, and aggregation of larval populations of 162 species of lepidoptera, feeding on the foliage of primarily deciduous trees in southern Ontario, were analyzed to test four hypotheses about the relationship of species to their resources. The lepidoptera larvae were treated both as exploiters of foliage and as resources for parasitoids. Multiple regression and partial correlation analysis revealed that (1) the abundance and variability of a moth population were independent of the diversity of host trees fed upon, (2) the incidence of parasitism on a moth population was independent of the variability of the host population, and (3) the diversity of parasites of a moth was independent of the variability of the host population. We raise the possibility that parasites may be ineffective control agents for lepidoptera species.


1947 ◽  
Vol 79 (5) ◽  
pp. 84-104 ◽  
Author(s):  
L. S. Hawboldt

This project arose out of studies of the European spruce sawfly, Gilpinia hercyniae (Htg.), in connection with the Canadian Forest Insect Survey at the Dominion Entomological Laboratories, Fredericton, N.B. Bessa selecta (Mg.) had been observed as a parasite of the larch sawfly, Pristiphora erichsoni (Htg.), but particular interest was aroused in it as a parasite occurring on the European spruce sawfly. The latter host was frequently found to bear the eggs and integumental funnels of B. selecta. The object was to study its biology and effectivness as a possible control factor of the spruce sawfly. However, great difficulty was experienced in rearing the host due to high mortality caused by disease. Hence the original aims were not attained to the entire satisfaction of the author.


1961 ◽  
Vol 93 (3) ◽  
pp. 228-238 ◽  
Author(s):  
F. T. Bird ◽  
J. M. Burk

An outbreak of the European spruce sawfly, Diprion hercyniae (Htg.), occurring in Eastern Canada between 1930 and 1942, was controlled by a virus disease (Balch and Bird, 1944). The sawfly has been kept at a low level by the disease and by parasitic insects introduced from Europe (Bird and Elgee, 1957).An infestation of the sawfly was discovered in 1947 near Sault Ste. Marie, Ontario, by the Forest Insect Survey Section of the Forest Biology Laboratory at Sault Ste. Marie. This infestation was about 100 miles beyond the previously known western distribution of the insect. Intensive larval sampling in 1949 showed that it was free from virus and practically free from introduced parasites. Thus, an excellent opportunity was provided to introduce the virus into a disease-free population, to study its establishment and spread, and to compare the long term effects of virus alone on population trends with the effects that virus plus introduced parasites were shown to have on population trends in New Brunswick (Bird and Elgee, 1957). The virus was introduced into the infestation in 1950 and studies were carried out each year from 1950 to 1959.


1940 ◽  
Vol 72 (4) ◽  
pp. 85-86 ◽  
Author(s):  
G. Stuart Walley

It was with some surprise that the writer encountered a representative of this rare and, until recently, little known genus, from a locality in south-eastern British Columbia. The specimen in question is a female reared at Ottawa, by officers of the Forest Insect Survey of the Division of Entomology, Irom the cocoon of a Chrysopid beaten from Engelmann spruce, Aug. 26, 1938, by Mr. D. N. Ross of the British Columbia Forest Service, in the vicinity of Bayne's Lake, B. C. The adult parasite emerged in the laboratory, Feb. 20, 1939.


1964 ◽  
Vol 96 (1-2) ◽  
pp. 134-134
Author(s):  
R. M. Prentice

The organization of the Forest Insect and Disease Survey, a continuing project of the Forest Entomology and Pathology Branch, Department of Forestry,was reviewed. Typical field and laboratlory operations in entomology at regional survey units were shown. The specific subject matter of the display included: a pictorial review of field sampling and insectary procedures; aids to identification of immature insects; a method of aerial survey wing an operational recorder; the life histories of seven species of defoliators; the establishment and spread of winter moth in the Maritimes and satin moth in British Columbia; and finally, machine methods of recording Survey data and procedures used in preparing the current series of national compilation of Forest Lepidoptera of Canada.


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