NEW DESCRIPTIONS OF LARVAE OF FOREST INSECTS: LARVAE OF THE GENUS EUPITHECIA (LEPIDOPTERA, GEOMETRIDAE)

1945 ◽  
Vol 77 (3) ◽  
pp. 53-55 ◽  
Author(s):  
W. C. McGuffin
Keyword(s):  
Forest Insect ◽  
Forest Insects ◽  
Insect Survey

During the last seven years, larvae representing more than a dozen species of the genus Eupithecia have been received by the Forest Insect Survey of Canada. With the hope that some of these larvae may be recognized more readily, two species are described herewith; additional notes are given on three species already described, and a key for the separation of mature larvae of these five species is presented at the end of this article.

Some Larvae of the Genus Itame Hübner (Lepidoptera: Geometridae)

1956 ◽  
Vol 88 (1) ◽  
pp. 6-16 ◽  
Author(s):  
W. C. McGuffin
Keyword(s):  
Life History ◽  
Forest Floor ◽  
The Other ◽  
External Morphology ◽  
Boreal Zone ◽  
Forest Insect ◽  
Forest Insects ◽  
Insect Survey ◽  
Reservoir Hosts

Although many forest insects feed in or on trees, a larger number live on the shrubs and herbs of the forest floor. The shrub and herb feeders should not be overlooked since they comprise an important part of the fauna and may serve as reservoir hosts of parasites of the more destructive forest insects. Some larvae of the genus Itame are tree feeders but many of them feed on shrubs. These larvae are frequently collected within the Boreal Zone of Canada. As no means for the identification of the larvae could be found in the literature this paper was written. It consists of an account of the life history and external morphology of the larvae of the genus, a key to separate the mature larvae and descriptions of ten species. These species are: I. ribearia (Fitch), I. evagaria (Hlst.), I. brunneata (Thunb.), I. andersoni Swett, I. occiduaria (Pack.), I. anataria (Swett), I. exauspicata (Wlk.), I. bitactata (Wlk.), I. denticulodes (Hlst.), and I. decorata (Hlst.). Studies of the first four species are based on material obtained on loans and studies of the other species were made on material reared by the Forest Insect Survey of the Forest Zoology Laboratory, Calgary, Alberta.

NEW DESCRIPTIONS OF LARVAE OF FOREST INSECTS. INTRODUCTION; I. PANTHEA (LEPIDOPTERA, PHALAENIDAE)

1942 ◽  
Vol 74 (1) ◽  
pp. 8-12 ◽  
Author(s):  
A. W. A. Brown ◽  
W. C. McGuffin
Keyword(s):  
Larval Stage ◽  
Considerable Proportion ◽  
Forest Insect ◽  
The Past ◽  
Forest Insects ◽  
Insect Survey

During the past five years several thousand samples of lepidopterous larvae have been collected from spruce in the course of the Canadian Forest Insect Survey (1). It was found that a considerable proportion of the species had been hitherto unknown in the larval stage, and that many others had been only briefly or superficially described. In this paper, and in subsequent instalments, descriptions will be presented for those species whose larvae, to the author's knowledge, have never been described before.

NEW DESCRIPTIONS OF LARVAE OF FOREST INSECTS, V, EUPITHECIA, HYDRIOMENA (LEPIDOPTERA, GEOMETRIDAE)

1942 ◽  
Vol 74 (8) ◽  
pp. 150-153 ◽  
Author(s):  
W. C. McGuffin
Keyword(s):  
Forest Insect ◽  
Forest Insects ◽  
Insect Survey

The geometrid larvae feeding on spruce form a large and varied group. In collections taken from all parts of Canada where spruce is found, the Forest Insect Survey has identified 31 species (Brown, 1). To the best of the author's knowledge, there are descriptions for only 16 of these species. In this and the two following papers, seven more are described and two are redescribed.

Estimation of Parasitism of Larch Sawfly Cocoons by Bessa harveyi Tnsd. in Survey Collections

1959 ◽  
Vol 91 (8) ◽  
pp. 496-500 ◽  
Author(s):  
W. G. H. Ives ◽  
R. M. Prentice
Keyword(s):  
Forest Insect ◽  
Small Areas ◽  
Pristiphora Erichsonii ◽  
Larch Sawfly ◽  
Insect Survey ◽  
Forest Biology ◽  
Biology Laboratory ◽  
Total Parasitism

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.

The Life History and Dispersal of the Bruce Spanworm, Operophtera bruceata (Hulst), (Lepidoptera: Geometridae)

1962 ◽  
Vol 94 (10) ◽  
pp. 1103-1107 ◽  
Author(s):  
C. E. Brown
Keyword(s):  
United States ◽  
Life History ◽  
The United States ◽  
American Continent ◽  
Forest Insect ◽  
North American Continent ◽  
The Third ◽  
The North ◽  
Insect Survey ◽  
Bruce Spanworm

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.

BESSA SELECTA (MEIGEN) (DIPTERA: TACHINIDAE) AS A PARASITE OF GILPINIA HERCYNIAE (HARTIG) (HYMENOPTERA: DIPRIONIDAE)

1947 ◽  
Vol 79 (5) ◽  
pp. 84-104 ◽  
Author(s):  
L. S. Hawboldt
Keyword(s):  
High Mortality ◽  
Great Difficulty ◽  
Control Factor ◽  
Forest Insect ◽  
Larch Sawfly ◽  
Insect Survey

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.

Artificially Disseminated Virus as a Factor Controlling the European Spruce Sawfly, Diprion hercyniae (Htg.) in the Absence of Introduced Parasites

1961 ◽  
Vol 93 (3) ◽  
pp. 228-238 ◽  
Author(s):  
F. T. Bird ◽  
J. M. Burk
Keyword(s):  
Virus Disease ◽  
Population Trends ◽  
Long Term Effects ◽  
Eastern Canada ◽  
Forest Insect ◽  
Insect Survey ◽  
Forest Biology ◽  
Biology Laboratory ◽  
Disease Free

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.

A NEW SPECIES OF BRACHYCYRTUS FROM BRITISH COLUMBIA (HYMEN.; ICHNEUMONIDAE)

1940 ◽  
Vol 72 (4) ◽  
pp. 85-86 ◽  
Author(s):  
G. Stuart Walley
Keyword(s):  
British Columbia ◽  
New Species ◽  
Forest Service ◽  
Adult Parasite ◽  
Forest Insect ◽  
South Eastern ◽  
Engelmann Spruce ◽  
Insect Survey ◽  
A New Species

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.

scholarly journals Conferința Internațională IUFRO ”Semnificația schimbărilor actuale de mediu asupra dăunătorilor și patogenilor din ecosistemele forestiere” Suceava, 16-20 septembrie 2019

2019 ◽  
Vol 19 (2) ◽  
pp. 209-218
Author(s):  
Mihai-Leonard Duduman ◽  
Daniela Lupaștean
Keyword(s):  
Central Europe ◽  
Forest Insect ◽  
Forest Insects ◽  
Disease Survey

În perioada 16 – 20 septembrie 2019, a avut loc la Suceava cea de-a 13-a conferință internațională a Grupului de lucru IUFRO* 7.03.10 „Methodology of forest insect and disease survey in Central Europe”, cu titlul „Recent Changes in Forest Insects and Pathogens Significance”. Conferința este organizată, la fiecare 2 ani, de către universități sau institute de cercetare din domeniul forestier din Europa iar, după 19 ani, conferința revine în România. Facultatea de Silvicultură din cadrul Universităţii ”Ștefan cel Mare” a avut onoarea de a fi organizatoarea acestei manifestări științifice importante, sub coordonarea comitetului grupului de lucru IUFRO 7.03.10. La buna desfășurare a conferinței au contribuit Asociația „Societatea pentru Silvicultură si Mediu Suceava”, precum și sponsorii Regia Națională a Pădurilor Romsilva și compania AlphaScent (USA). Temele abordate în cadrul conferinței se încadrează în sfera preocupărilor privind dăunătorii și bolile care afectează pădurile din Emisfera Nordică și identificarea de soluții tehnice pentru controlul bolilor și dăunătorilor, respectiv: actualizarea informațiilor privind distribuția bolilor si dăunătorilor forestieri; identificarea si monitorizarea speciilor invazive de boli și dăunători și identificarea de soluții pentru reducerea impactului bolilor și dăunătorilor forestieri. Conferința a reunit peste 80 de participanți și invitați, cercetători și practicieni din domeniul protecției pădurilor din 19 țări, care au împărtășit rezultatele activității lor în domeniul protecției pădurilor în cadrul celor 31 de prezentări orale și a celor 28 de postere afișate. Cu sprijinul colegilor de la Direcția Silvică Suceava, Ocolul Silvic Adâncata și Ocolul Silvic Pojorâta, programul conferinței a inclus o excursie in rezervațiile naturale Pădurea Zamostea Luncă și Codrul Secular Giumalău, o ocazie rară pentru participanți de a cunoaște și admira frumusețea naturii acestui colț de țară.

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