Spruce budworm outbreaks and the incidence of vagrancy in eastern North American wood-warblers

1998 ◽  
Vol 76 (3) ◽  
pp. 433-439 ◽  
Author(s):  
Michael A Patten ◽  
Jutta C Burger
Keyword(s):  
Population Density ◽  
North American ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Population Densities ◽  
Seiurus Aurocapillus ◽  
Data Set ◽  
Negatively Associated ◽  
Wood Warblers

The Tennessee (Vermivora peregrina), Cape May (Dendroica tigrina), Bay-breasted (D. castanea), and Canada (Wilsonia canadensis) warblers and the Ovenbird (Seiurus aurocapillus) appear to show positive numerical responses to outbreaks of the spruce budworm (Choristoneura fumiferana); the Magnolia (D. magnolia), Black-throated Green (D. virens), and Blackburnian (D. fusca) warblers may occur in lower numbers during outbreaks because of increased competition with these budworm specialists. Thus, we predicted that the number of fall vagrant Tennessee, Cape May, and Bay-breasted warblers and Ovenbirds occurring in California are highly positively associated with budworm population density, positively intercorrelated, and negatively associated with numbers of Magnolia, Black-throated Green, and Blackburnian warblers. A 23-year (1972-1994) data set of budworm population densities and vagrant warbler occurrences in California showed that (i) budworm population density was an excellent predictor (explaining about 50% of the variance) of numbers of occurrences of the Cape May, Bay-breasted, and Canada warblers; (ii) all warbler species tended to co-occur, with numbers of Cape May and Bay-breasted warblers especially highly intercorrelated; and (iii) Magnolia Warbler numbers were negatively associated with those of budworm specialists, but Black-throated Green and Blackburnian warblers showed no association.

Response of the ovenbird (Aves: Parulidae) to an outbreak of the spruce budworm

1975 ◽  
Vol 53 (11) ◽  
pp. 1669-1672 ◽  
Author(s):  
Reto Zach ◽  
J. Bruce Falls
Keyword(s):  
Functional Response ◽  
Clutch Size ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Great Variability ◽  
Food Abundance ◽  
Numerical Response ◽  
Seiurus Aurocapillus ◽  
Wood Warblers

The response of the ovenbird (Seiurus aurocapillus) to an outbreak of the spruce budworm (Choristoneura fumiferana) was investigated in Algonquin Park, Ontario. Ovenbirds exhibited a functional response involving an unusual method of foraging for this species. The numerical response was based on smaller, more tightly packed territories and probably also on larger first and subsequent clutches. It is suggested that the great variability in clutch size of certain wood warblers (Parulidae) may indicate a tendency to lay successive clutches under conditions of food abundance.

EVALUATION OF HIGH-CAPACITY, NONSATURATING SEX PHEROMONE TRAPS FOR MONITORING POPULATION DENSITIES OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

1986 ◽  
Vol 118 (7) ◽  
pp. 611-619 ◽  
Author(s):  
C.J. Sanders
Keyword(s):  
Sex Pheromone ◽  
Wind Tunnel ◽  
Population Density ◽  
Choristoneura Fumiferana ◽  
High Capacity ◽  
Spruce Budworm ◽  
Pheromone Traps ◽  
Population Changes ◽  
Population Densities ◽  
Sex Pheromone Traps

AbstractThe efficiency of two sticky-bottomed traps and seven high-capacity, nonsticky traps in catching male spruce budworm [Choristoneura fumiferana (Clem.)] moths was evaluated in a wind tunnel. The place where the male moths first contacted the trap, the length of time that passed until they entered the trap, and the number remaining in the trap after 5 min were recorded. The most efficient traps were the Pherocon 1 C, a sticky-bottomed trap, and the Multi-Pher and Uni-trap, both nonsticky traps with internal funnel-shaped baffles that prevent moths from escaping. As sticky traps become saturated at relatively low densities they are not suitable for monitoring wide changes in population density. The Multi-Pher and Uni-trap are therefore recommended for monitoring population changes of the spruce budworm, establishing thresholds for management action, and estimating population density.

MONITORING SPRUCE BUDWORM POPULATION DENSITY WITH SEX PHEROMONE TRAPS

1988 ◽  
Vol 120 (2) ◽  
pp. 175-183 ◽  
Author(s):  
C.J. Sanders
Keyword(s):  
Sex Pheromone ◽  
Population Density ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Pheromone Traps ◽  
Cooperative Research ◽  
Population Densities ◽  
Larval Population ◽  
Northwestern Ontario ◽  
Sex Pheromone Traps

AbstractAnnual catches of male spruce budworm (Choristoneura fumiferana [Clem.]) in sex pheromone traps over a 21-year period in northwestern Ontario were well correlated with larval population densities in each subsequent year (r2 = 81%). On the basis of the criterion of 3 successive years of increasing catches or a threshold of 50 moths per trap, warning of extensive defoliation could have been given 6 years in advance. In 18 plots in northwestern Ontario and 35 plots distributed throughout the province, coefficients of determination (r2) between catch and population density in the same generation ranged from 40 to 74% in 1982 and 1983, but fell below 23% in 1984 when population densities in many plots were high. Coefficients of determination between catch and population densities in the following generation (eggs or larvae) ranged from 41 to 62%. On the basis of several years of cooperative research, sex pheromone traps are now in operational use in eastern North America for monitoring spruce budworm populations.

LONG TERM STUDY OF THE EFFECTIVENESS OF AERIAL APPLICATION OF BACILLUS THURINGIENSIS – ACEPHATE COMBINATIONS AGAINST THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1977 ◽  
Vol 109 (9) ◽  
pp. 1239-1248 ◽  
Author(s):  
O. N. Morris
Keyword(s):  
Bacillus Thuringiensis ◽  
Choristoneura Fumiferana ◽  
Larval Mortality ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
White Spruce ◽  
Balsam Fir ◽  
Population Densities ◽  
Long Term Study

AbstractBacillus thuringiensis (Dipel® 36B) mixed with a sublethal concentration of acephate (Orthene®) (O, S-dimethyl acetylphosphoramidothioate), an organophosphorous insecticide, was applied at 2.35–14 l./ha to white spruce (Picea glauca) and balsam fir (Abies balsamea) trees infested with spruce budworm, Choristoneura fumiferana (Clem.). The treatment rate was 20 Billion International Units of B. thuringiensis (B.t.) activity with or without 42 g of active ingredient of acephate/ha.The ground deposit of the standard Dipel wettable powder formulation was 12% of emitted volume compared with 21–32% for the Dipel 36B flowable. The viability of B.t. spores was drastically reduced after 1 day of weathering but a high level of biological activity by the spore–crystal complex persisted for up to 20 days post-spray due probably to crystal activity.The addition of about 10% of the recommended operational rate of acephate to the B.t. suspension increased larval mortality by 34% when applied at 4.7 l./ha. Reductions in budworm populations were 97–99% in B.t. + acephate plots and 86–90% in B.t. alone plots.Plots with moderate budworm densities of up to 27 larvae/100 buds on white spruce and 36/100 on balsam fir were satisfactorily protected from excessive defoliation in the year of spray by B.t. with or without acephate. Plots with higher population densities were not satisfactorily protected based on the branch sample examination but aerial color photographs indicated good protection to the top third of the trees. Population declines were greater and defoliation and oviposition were lower in the treated plots than in the untreated checks 1 year later without further treatment. Two years later the larval population densities in all plots were low but the density was twice as high in the untreated check as in the treated plots, indicating long term suppression by the treatments. Defoliation was negligible in all plots.The treatments had no deleterious effect on spruce budworm parasitism. The data indicate that the integrated approach using Bacillus thuringiensis – chemical pesticide combinations is a viable alternative to the use of chemical pesticides alone in spruce budworm control. Large scale testing is now warranted.

FORECASTING THE EFFICACY OF OPERATIONAL BACILLUS THURINGIENSIS BERLINER APPLICATIONS AGAINST SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA CLEMENS (LEPIDOPTERA: TORTRICIDAE), USING DOSE INGESTION DATA: INITIAL MODELS

1992 ◽  
Vol 124 (6) ◽  
pp. 1101-1113 ◽  
Author(s):  
Richard A. Fleming ◽  
Kees van Frankenhuyzen
Keyword(s):  
Bacillus Thuringiensis ◽  
Population Density ◽  
Choristoneura Fumiferana ◽  
Lethal Dose ◽  
Spruce Budworm ◽  
Initial Application ◽  
Eastern Spruce Budworm ◽  
Population Reduction ◽  
Support Tools ◽  
Image Position

AbstractSingle aerial applications of Bacillus thuringiensis Berliner (Bt) to control infestations of the eastern spruce budworm (Choristoneura fumiferana Clemens) have had varied operational success. Double applications are too expensive for general use, but might prove useful if directed to areas where the initial application was unsuccessful. This requires forecasts of the efficacy of the initial application in operational spray blocks within 4–5 days.Data were collected in 30 spray blocks in 1989 in a feasibility study to determine if such forecasts of spray efficacy could be made from the prespray budworm population density, N0, and from the proportion of the population that had ingested a lethal dose Bt within 2 days of application, M. A mathematical model forecasting the postspray budworm population density, NF, was derived from population-dynamic considerations and fitted (r2 = 0.48, p < 0.0001):The proportion of current foliage defoliated, D, depended (r = 0.81) on N0 and on whether the block was sprayed (I = 0) or not (I = 1):Only one measure of defoliation involved M in any statistically significant way. The predicted (from values of N0) proportion of defoliation prevented by Bt application, dD, was weakly (r2 = 0.25, p = 0.002) related to M:The large proportion of the variation in efficacy that remains unexplained by the models involving M limits the operational utility of this approach as it now stands for specific sites. The potential for further development of these models as decision support tools for fairly large spray blocks is discussed in terms of improving the sampling plan and including additional predictor variables.Methods are also presented that reduce bias in calculations of population reduction (Abbott 1925) and foliage protection when data are available from few control and many treatment blocks.

FACTORS AFFECTING CALLING BY FEMALE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1972 ◽  
Vol 104 (11) ◽  
pp. 1751-1762 ◽  
Author(s):  
C. J. Sanders ◽  
G. S. Lucuik
Keyword(s):  
Choristoneura Fumiferana ◽  
Mating Behaviour ◽  
Spruce Budworm ◽  
Population Densities ◽  
Factors Affecting ◽  
Calling Behaviour ◽  
Eastern Spruce Budworm ◽  
Distance Communication ◽  
C 50 ◽  
Pheromone Release Rate

AbstractCalling (extrusion of the sex pheromone-producing gland) by spruce budworm females follows a circadian rhythm regulated by the initiation of the photophase. At 2 °C 50% of the females call by 131/2 hr after "lights-on." Calling starts earlier at cooler temperatures. Females that have not been exposed to lights-on start calling as soon as darkness occurs. Virgin females are most attractive 3 to 4 days after emergence. Mated females call intermittently and are attractive but compete poorly with virgins. Once started, female budworm call continuously throughout the calling period, implying that their pheromone release rate is lower than if they called for short intervals only as in some other Lepidoptera. This may influence the quantities of synthetic pheromone required to disrupt mating behaviour. Calling behaviour is not influenced by the proximity of other adult budworm. At high population densities, males are apparently able to locate females before or as soon as they start to call, suggesting that communication is short range. Longer distance communication probably operates at low population densities. Population regulation by disrupting mating behaviour is therefore unlikely to succeed except at relatively low population densities.

RELATIONSHIPS BETWEEN CATCH IN PHEROMONE-BAITED TRAPS AND LARVAL DENSITY OF THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1983 ◽  
Vol 115 (11) ◽  
pp. 1437-1443 ◽  
Author(s):  
S. B. Ramaswamy ◽  
R. T. Cardé ◽  
J. A. Witter
Keyword(s):  
Adult Male ◽  
Choristoneura Fumiferana ◽  
Larval Density ◽  
Spruce Budworm ◽  
Population Densities ◽  
Sticky Traps ◽  
Baited Traps ◽  
Highly Correlated

AbstractLarval densities and catch of adult male Choristoneura fumiferana (Clemens) in pheromone-baited covered funnel traps in the same year were highly correlated. Such traps avoid saturation problems associated with conventional sticky traps. Release of marked males resulted in recapture rates of up to 21% in covered funnel traps. The findings suggest that non-saturating pheromone-baited traps could be used to monitor population densities and trends of the spruce budworm.

THE EFFECT OF THE POXVIRUS OF THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE), ON MAMMALS AND BIRDS

1972 ◽  
Vol 104 (9) ◽  
pp. 1333-1342 ◽  
Author(s):  
Charles H. Buckner ◽  
John C. Cunningham
Keyword(s):  
Life History ◽  
Adverse Effects ◽  
Small Mammals ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Normal Weight ◽  
Population Densities ◽  
Wild Mammals ◽  
Life History Parameters ◽  
Rats And Mice

AbstractLaboratory-bred rats and mice fed heavy doses of the poxvirus of the spruce budworm showed no ill effects and made normal weight gains as compared with controls over a period of 8 weeks, and no deaths occurred in the treated groups. Laboratory and wild mammals exposed to aerial spray in open-topped cages similarly showed no adverse effects. Population densities, fecundity, and other pertinent life history parameters of small mammals and birds were studied relative to treatment of a forest with the poxvirus for control of spruce budworm. There were no observable interactions between these small vertebrates and the virus. It is concluded that, from the standpoint of homoiothermic vertebrates, the virus is a safe insecticide.

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