A Key Age Interval in Generation Survival

doi:10.4039/ent96145-1

A Key Age Interval in Generation Survival

The Canadian Entomologist ◽

10.4039/ent96145-1 ◽

1964 ◽

Vol 96 (1-2) ◽

pp. 145-145 ◽

Cited By ~ 1

Author(s):

Keyword(s):

Population Dynamics ◽

Forest Management ◽

New Brunswick ◽

Spruce Budworm ◽

Forest Research ◽

Research Project ◽

Green River ◽

Set Up

In 1944 a forest research project involving industry and two levels of government was set up to integrate entomological, pathological, silvicultural and management studies aimed at the control of the spruce budworm through forest management. The entomological phase of this praject, called the ‘Green River Project’, was initiated in 1945, and by 1949 was deeply involved in the budworm outbreak that occurred in northern New Brunswick during the period 1949-59. The basic aim was to elucidate the population dynamics of the budworm during an outbreak.

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Notes on the Biology of Synetaeris tenuifemur Walley (Hymenoptera: Ichneumonidae)

The Canadian Entomologist ◽

10.4039/ent9524-1 ◽

1963 ◽

Vol 95 (1) ◽

pp. 24-28 ◽

Cited By ~ 6

Author(s):

C. A. Miller ◽

T. R. Renault

Keyword(s):

British Columbia ◽

New Brunswick ◽

Choristoneura Fumiferana ◽

Spruce Budworm ◽

Green River ◽

Low Level ◽

Northwestern Ontario ◽

North Western

The species discussed below was first recorded under the name Synetaeris n. sp. as a parasite of the spruce budworm, Choristoneura fumiferana Clem., in Ontario by McGugan and Blais (1959), although they point out that it may have been collected from budworm in British Columbia during the 1940's but incorrectly identified at that time. These authors collected S. tenuifemur during the declining years of a budworm outbreak in the Lake Nipigon region of northwestern Ontario, and it was during the declining years of a severe outbreak that the parasite was first reared from budworm in the Green River area of north-western New Brunswick (Morris, 1963, in press). These data suggest that S. tenuifemur is associated with endemic budworm populations, an assumption advanced by McGugan and Blais (1959). However, it was not found in the Green River area from 1945 to 1947 when budworm density was at a low level prior to the 1949-1959 outbreak.

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The Interaction of the Spruce Budworm, Choristoneura fumiferana (Clem.), and the Parasite Apanteles fumiferanae Vier.

The Canadian Entomologist ◽

10.4039/ent91457-8 ◽

1959 ◽

Vol 91 (8) ◽

pp. 457-477 ◽

Cited By ~ 29

Author(s):

C. A. Miller

Keyword(s):

New Brunswick ◽

Choristoneura Fumiferana ◽

Spruce Budworm ◽

Forest Pest ◽

Mortality Factors ◽

Term Study ◽

Green River ◽

Long Term Study ◽

The Subject

In the late 1940's significant increases in the population of the spruce budworm, worm, Choristoneura fumiferana (Clem.), occurred in northern New Brunswick and culminated in a severe outbreak of this major forest pest. The outbreak has been the subject of intensive investigations dealing with emergency chemical control operations (Webb, 1956) and with a long-term study of the population dynamics of the budworm. The latter program, called the Green River Project, is located on the Green River Watershed in northwestern New Brunswick. Its objectives, the co-operating agencies involved, the mortality factors being studied, and methodology have been discussed elsewhere by Morris et al. (1956), Morris (1951), Morris and Miller (1954), and Morris (1955).

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NINE YEARS OF DEVELOPMENTS IN A MATURE MIXEDWOOD STAND, GREEN RIVER NEW BRUNSWICK

The Forestry Chronicle ◽

10.5558/tfc36006-1 ◽

1960 ◽

Vol 36 (1) ◽

pp. 6-9 ◽

Cited By ~ 3

Author(s):

E. L. Hughes

Keyword(s):

New Brunswick ◽

Growth Data ◽

Green River ◽

Growth Capacity ◽

Birch Trees

Growth data collected on three permanent one-acre sample plots, established in a mixedwood stand in northwestern New Brunswick in 1947 and remeasured in 1956, indicate (1) growth capacity of the site may be as high as 79 cubic feet per acre per year, (2) birch trees weakened by dieback do not provide much competition to softwoods and (3) because of the mortality of birch attributed to birch dieback, the stand is evolving from a mature mixedwood towards an irregularly-aged softwood stand.

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The influence of hardwood content on balsam fir defoliation by spruce budworm

Canadian Journal of Forest Research ◽

10.1139/x26-182 ◽

1996 ◽

Vol 26 (9) ◽

pp. 1620-1628 ◽

Cited By ~ 108

Author(s):

Qiong Su ◽

Ted D. Needham ◽

David A. MacLean

Keyword(s):

New Brunswick ◽

Natural Enemies ◽

Spruce Budworm ◽

Balsam Fir ◽

Generalized Model ◽

Stand Management ◽

Working Hypothesis ◽

Model Combining

Changing stand composition by increasing hardwood content has been suggested as a long-term method for reducing susceptibility and vulnerability of balsam fir (Abiesbalsamea (L.) Mill.) to spruce budworm (Choristoneurafumiferana (Clem.)). Twenty-five mixed balsam fir–hardwood stands were selected in northern New Brunswick, with five stands in each 20% hardwood class (0–20, 21–40%, etc.). Defoliation each year from 1989 to 1993 was significantly (p < 0.0001) related to hardwood content, with r2 ranging from 0.57 to 0.81. As hardwood content increased, defoliation of balsam fir decreased. From 1989 to 1992, the years of moderate to severe defoliation, balsam fir stands with <40% hardwoods sustained 58–71% defoliation, on average, versus 12–15% defoliation in stands with >80% hardwood. A generalized model combining hardwood content and the estimated defoliation in pure softwood stands in a given year explained 77% of the variation in defoliation over stands and years. This study indicated that mixed balsam fir–hardwood stand management, with hardwood content >40%, could substantially reduce losses during spruce budworm outbreaks. Further research is warranted to elucidate the mechanism involved, but our working hypothesis is that greater hardwood content increased the diversity or populations of natural enemies such as birds and parasitoids.

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PREDATION BY INSECTS AND SPIDERS INHABITING COLONIAL WEBS OF HYPHANTRIA CUNEA

The Canadian Entomologist ◽

10.4039/ent1041197-8 ◽

1972 ◽

Vol 104 (8) ◽

pp. 1197-1207 ◽

Cited By ~ 18

Author(s):

R. F. Morris

Keyword(s):

Population Dynamics ◽

Nova Scotia ◽

North America ◽

Population Density ◽

New Brunswick ◽

Numerical Response ◽

Initial Number ◽

Hyphantria Cunea ◽

The North ◽

The Mean

AbstractThe number of predators inhabiting nests of Hyphantria cunea Drury was recorded annually for 13 years in four areas in New Brunswick and two areas on the coast of Nova Scotia. The most common groups were the pentatomids and spiders, which sometimes reproduced within the nests, but the mean number per nest was low in relation to the number of H. cunea larvae in the colonies. The rate of predation on fifth-instar larvae was low. Small or timid predators appeared to prey largely on moribund larvae or small saprophagans during the principal defoliating instars of H. cunea.No relationship could be detected between the number of larvae reaching the fifth instar and the number of predators in the colony; nor could any functional or numerical response of the predators to either the initial number of larvae per colony or the population density of colonies be found. It is concluded that the influence of the nest-inhabiting predators is small and relatively stable, and may be treated as a constant in the development of models to explain the population dynamics of H. cunea.H. cunea is a pest in parts of Europe and Asia, where it has been accidentally introduced from North America. The introduction to other continents of the North American predator, Podisus maculiventiis (Say), is discussed briefly.

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A METHOD FOR REARING THE LARVAL STAGES OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA CLEMENS (LEPIDOPTERA: TORTRICIDAE), FOR PHYSIOLOGICAL STUDIES

The Canadian Entomologist ◽

10.4039/ent1221271-11 ◽

1990 ◽

Vol 122 (6) ◽

pp. 1271-1272 ◽

Cited By ~ 3

Author(s):

Hemendra Mulye ◽

Roger Gordon

Keyword(s):

Population Dynamics ◽

North America ◽

Choristoneura Fumiferana ◽

Insect Pest ◽

Spruce Budworm ◽

Forest Pest ◽

Forest Insect ◽

Larval Stages ◽

Eastern Spruce Budworm ◽

Physiological Studies

The eastern spruce budworm, Choristoneura fumiferana Clemens, is the most widely distributed and destructive forest insect pest in North America. Although much is known about the ecology, population dynamics, and impact of C. fumiferana on tree growth (Sanders et al. 1985), there is very little information available on the physiology of this forest pest. Physiological studies are crucial to the development of novel strategies for spruce budworm control.

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Natural variation in balsam fir foliar components of dietary importance to spruce budworm

Canadian Journal of Forest Research ◽

10.1139/x77-007 ◽

1977 ◽

Vol 7 (1) ◽

pp. 47-53 ◽

Cited By ~ 9

Author(s):

G. G. Shaw ◽

C. H. A. Little

Keyword(s):

Population Dynamics ◽

Natural Variation ◽

Spruce Budworm ◽

Balsam Fir ◽

Total Sugars ◽

Caloric Value ◽

Seasonal Trends ◽

Geographical Variations ◽

Foliar Concentrations ◽

Foliar Concentration

Year-to-year, geographical, and local variations in foliar concentrations of crude fat, nitrogen, total sugars, and starch and in foliar caloric value were determined for maturing, current-year needles of balsam fir (Abiesbalsamea L.). All except geographical variations proved to be statistically significant. Seasonal trends of chemical concentrations in maturing needles were in agreement with previous findings.Much of the variation in foliar caloric value could be explained by changes in foliar concentration of crude fat.Year-to-year changes in foliar nutrients may influence spruce budworm population dynamics.

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Population Dynamics of major Mangrove species in the Sundarbans, Bangladesh

Indian Journal of Forestry ◽

10.54207/bsmps1000-2019-8l2tin ◽

2019 ◽

Vol 42 (4) ◽

pp. 317-322

Author(s):

Asm Helal Siddqui ◽

◽

Akramul Islam ◽

Keyword(s):

Population Dynamics ◽

Growth Dynamics ◽

Forest Research Institute ◽

Forest Research ◽

Mangrove Species ◽

Permanent Sample Plots ◽

Sampling Process ◽

Multistage Sampling ◽

The Sundarbans ◽

Saline Zone

Growth dynamics of major mangrove species in three salinity zones of the Sundarbans was conducted by establishing permanent sample plots (PSPS) by the Mangrove Silviculture Division of the Bangladesh Forest Research Institute. Multistage sampling process was applied to collect data from 33 Permanent Sample Plots (PSPs), area of each PSP being 400 m2. Total number of seedlingh, saplings in each saline zone and total regeneration percentage of each species in the PSPs was worked out.

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