Predicting the seasonal development of the yellowheaded spruce sawfly (Hymenoptera: Tenthredinidae) in eastern Canada

2007 ◽  
Vol 139 (3) ◽  
pp. 365-377 ◽  
Author(s):  
Jacques Régnière ◽  
Dan Lavigne ◽  
Alain Dupont ◽  
Nelson Carter
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Adult Emergence ◽  
Seasonal Development ◽  
Data Sets ◽  
Pheromone Traps ◽  
Degree Days ◽  
Eastern Canada ◽  
Larval Stages ◽  
Degree Day

AbstractDegree-day phenology models for the yellowheaded spruce sawfly, Pikonema alaskensis (Rohwer), were developed from data sets collected in infested plantations of black spruce, Picea mariana (Mill.), and white spruce, P. glauca (Moench) Voss, in New Brunswick and Quebec, Canada, between 1995 and 1999. The models describe the relationships between degree-day accumulation (above −1 °C, from 1 April) and cumulative adult emergence, capture in pheromone traps, the dates of appearance of first adult, egg, and larva, and the relative frequency of successive larval stages. The models predict adult emergence with a precision of ±2 days and male catch in pheromone traps with a precision of ±1.6 days. The first adult, first egg, and first larva occurred after 527 ± 42, 660 ± 52, and 725 ± 18 degree-days above –1 °C, respectively, and the dates of these events are predicted within ±1.8 days. The dates of 50% occurrence of the successive instars are predicted within 4.5 days of observed dates, and the date of peak 2nd instar is predicted within ±3.6 days.

Degree-day models to predict carrot weevil (Coleoptera: Curculionidae) emergence and oviposition in Nova Scotia, Canada

2020 ◽  
Vol 152 (3) ◽  
pp. 374-388
Author(s):  
Suzanne Blatt ◽  
Deney Augustine Joseph ◽  
G. Christopher Cutler ◽  
A. Randall Olson ◽  
Scott White
Keyword(s):  
Nova Scotia ◽  
Adult Emergence ◽  
Hill Equation ◽  
Base Temperature ◽  
Degree Days ◽  
Eastern Canada ◽  
Leaf Stage ◽  
True Leaf ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractCarrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), is a pest of carrot (Daucus carota var. sativus Hoffmann; Apiaceae) throughout eastern Canada. Carrot weevil emergence and oviposition were monitored in commercial carrot fields in Nova Scotia. Cumulative degree days were calculated using a base temperature of 7 °C (DD7), and models were developed to predict cumulative emergence and oviposition using nonlinear regression. Cumulative emergence and oviposition were adequately explained as functions of DD7 by a three-parameter sigmoidal Hill equation. Our emergence model predicted initial and peak adult emergence at 35 and 387 DD7, respectively, with oviposition on carrot baits occurring as early as 42 DD7. Models were then validated to evaluate how well they performed. Oviposition on carrot plants began at the fourth true-leaf stage (342 DD7) and continued until eleventh true-leaf stage. Growers using these models can identify their window of opportunity to manage their carrot weevil populations targeting the majority of emerged adults before oviposition begins in the field.

DEGREE-DAY RELATIONSHIPS TO THE DEVELOPMENT OF LITHOCOLLETIS BLANCARDELLA (LEPIDOPTERA: GRACILLARIIDAE) AND ITS PARASITE APANTELES ORNIGIS (HYMENOPTERA: BRACONIDAE)

1979 ◽  
Vol 111 (10) ◽  
pp. 1177-1184 ◽  
Author(s):  
E. F. Johnson ◽  
R. Trottier ◽  
J. E. Laing
Keyword(s):  
Pest Management ◽  
Natural Enemy ◽  
Field Studies ◽  
Management Programme ◽  
Seasonal Development ◽  
Daily Maximum ◽  
Degree Days ◽  
Degree Day ◽  
Temperature Thresholds ◽  
Stevenson Screen

AbstractDegree-day relationships in the development of Lithocolletis blancardella (Fab.) and Apanteles ornigis Weed, its major parasite, were established from laboratory and field studies in Ontario apple orchards during 1973, 1974, and 1975. Under constant laboratory conditions, temperature thresholds for development of overwintering pupae were estimated by three methods, and found to be 6.3°, 6.7°, and 5.7°C for L. blancardella, and 10.4°, 10.4°, and 11.3°C for A. ornigis. Degree-day accumulations in the field were calculated by two methods using daily maximum and minimum temperatures recorded from the pupal habitat and a Stevenson screen. Degree-days in the pupal habitat accumulated from 1 January, above 5.7°C for L. blancardella and 11.3°C for A. ornigis were more accurate than Stevenson screen degree-day accumulations for predicting first emergence; however, after emergence, seasonal development was best related to Stevenson screen degree-days accumulated from 1 April, above 6.7°C for L. blancardella and 10.4°C for A. ornigis. This study shows that degree-day relationships can be used in an apple pest management programme to optimize timing of insecticide applications against L. blancardella and preserve A. ornigis, its major natural enemy.

Invertebrate predation of postdispersal seeds and juvenile seedlings of black spruce (Picea mariana) in the boreal forest of eastern Canada

2005 ◽  
Vol 35 (3) ◽  
pp. 674-681 ◽  
Author(s):  
Mathieu Côté ◽  
Jean Ferron ◽  
Réjean Gagnon
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Pitfall Traps ◽  
Invertebrate Predation ◽  
Habitat Types ◽  
Eastern Canada ◽  
Exclosure Experiment ◽  
Seedling Predation ◽  
Lichen Woodland ◽  
Abundance And Diversity

We used an extensive vertebrate exclosure experiment to evaluate black spruce (Picea mariana (Mill.) B.S.P.) postdispersal seed and seedling predation by invertebrates in three boreal habitats of Eastern Canada: recent burn, spruce–moss, and lichen woodland. Between 9% and 19% of seeds were eaten by invertebrates. Seed predation was higher in recent burns than in spruce–moss and lichen woodlands. Abundance and diversity of potential invertebrate seed consumers sampled in pitfall traps also varied among habitat types. Among the invertebrate seed consumers sampled, Myrmica spp. (Hymenoptera: Formicidae) and Pterostichus adstrictus (Eschscholtz, 1823) (Coleoptera: Carabidae) were the most numerous; Formica spp. (Hymenoptera: Formicidae) and Pterostichus punctatissimus (Randall, 1838) (Coleoptera: Carabidae) were also present. Between 2% and 12% of juvenile black spruce seedlings were eaten by invertebrates. The most important seedling consumers were slugs (molluscs). Invertebrate predation of seeds and seedlings was highest (19% and 12%) in recent burns, indicating that invertebrate predation may significantly influence black spruce regeneration in these sites.

Female gametophyte and embryo development of black spruce along a shore-hinterland climatic gradient of a recently created reservoir, northern Quebec

1999 ◽  
Vol 77 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Luc Sirois ◽  
Yves Bégin ◽  
Johanne Parent
Keyword(s):  
Embryo Development ◽  
Picea Mariana ◽  
Female Gametophyte ◽  
Black Spruce ◽  
Growing Season ◽  
Seed Maturation ◽  
Cooling Effect ◽  
Sigmoid Function ◽  
Embryo Maturation ◽  
Degree Days

The development of female gametophytes and embryos in relation to cumulative growing degree-days was followed to see if the postulated cooling influence of the Robert-Bourassa reservoir (LG2, northern Quebec) slowed the reproductive process of black spruce (Picea mariana (Mill.) B.S.P.). During the 1996 growing season, three to five developing seed cones were harvested 11 times on nine trees distributed along a shore-hinterland gradient of the northern shore of the reservoir. The daily thermal sum (degree-days > 5°C) in the seed cone zone of the same trees was also monitored to describe the female gametophyte and embryo development of this species as a function of heat sum. The 23 developmental stages identified in this study confirm that the female gametophyte and embryo of P. mariana develop according to the same pattern exhibited by other Picea spp. These stages, although unequal in duration, succeeded each other according to a sigmoid function of the temperature sum. Direct temperature measurements taken 0, 25, and 100 m from the shore of the Robert-Bourassa reservoir suggest the interior trees experienced 107 more degree-days > 5°C than the shoreline trees during seed maturation. Although gametophyte development of the shoreline trees was delayed early in the growing season (Kruskall-Wallis, p = 0.05), this delay does not persist afterward. Despite the net cooling effect of the Robert-Bourassa reservoir, all studied trees achieved embryo maturation in 1996. During this growing season, the warmest since 1977, it took embryos 800-940 degree-days to mature. The shoreline trees reached this temperature threshold later than interior trees. It is suggested that the cooling effect of the Robert-Bourassa reservoir could contribute to the inhibition of embryo maturation in shoreline trees during growing seasons with less than 800 degree-days.Key words: black spruce, climate change, cone development, northern boreal forests, Picea mariana, seed maturation.

THE USE OF DEGREE-DAYS TO PREDICT EMERGENCE OF THE APPLE MAGGOT, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE), IN ONTARIO

1984 ◽  
Vol 116 (8) ◽  
pp. 1123-1129 ◽  
Author(s):  
J. E. Laing ◽  
J. M. Heraty
Keyword(s):  
Adult Emergence ◽  
Cold Period ◽  
Threshold Temperature ◽  
Rhagoletis Pomonella ◽  
Degree Days ◽  
Calendar Date ◽  
Degree Day ◽  
Emergence Traps

AbstractAdult flies of the apple maggot, Rhagoletis pomonella (Walsh), were monitored for 6 years at Guelph, Ontario using aerial and ground-emergence traps. Two degree-day (°D) models to predict adult emergence were tested. Fifty percent of the adults were captured in an average of 809 ± 50 (SD) °D8.7 and first capture was at 638 ± 60°D6.4. Degree-day models which have been proposed previously and those developed in this study were only slightly more accurate than average calendar date for predicting adult emergence. Differences in °D requirements for emergence in each year were correlated with the length of cold period and the correlation suggested that the length of cold period preceding morphogenesis affects either the number of °D required to complete postdiapause development or the threshold temperature for development.

Fire and substrate interact to control the northern range limit of black spruce (Picea mariana) in Alaska

2007 ◽  
Vol 37 (12) ◽  
pp. 2480-2493 ◽  
Author(s):  
Andrea H. Lloyd ◽  
Christopher L. Fastie ◽  
Hilary Eisen
Keyword(s):  
Sexual Reproduction ◽  
Picea Mariana ◽  
Fire History ◽  
Black Spruce ◽  
Seed Viability ◽  
Range Limit ◽  
Acidic Soils ◽  
Eastern Canada ◽  
Substrate Effects ◽  
Northern Range Limit

Black spruce ( Picea mariana (Mill.) BSP) is a common treeline species in eastern Canada but rare at treeline in Alaska. We investigated fire and substrate effects on black spruce populations at six sites along a 74 km transect in the Brooks Range, Alaska. Our southern sites, on a surface deglaciated >50 000 years ago, had significantly more acidic soils, more black spruce, and higher seed viability than our northern sites, which were deglaciated approximately 13 000 years ago. Despite similar fire history at five of our six sites, postfire recruitment dynamics varied with surface age. Sexual reproduction was vigorous in both postfire and nonfire years in populations on the older surface. On the younger surface, vigorous sexual reproduction was restricted to postfire decades and clonal reproduction by branch layering predominated in nonfire years. At the northernmost site, which was unburned, black spruce reproduced almost exclusively by layering. The species’ northern range limit thus reflects an interaction between fire and substrate: on recently deglaciated surfaces, sexual reproduction is restricted to postfire years. This substrate-induced dependence on fire may restrict the range of black spruce to sites that burn sufficiently often to allow occasional sexual reproduction.

scholarly journals Wood density and wood shrinkage in relation to initial spacing and tree growth in black spruce (Picea mariana)

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Shu Yin Zhang ◽  
Haiqing Ren ◽  
Zehui Jiang
Keyword(s):  
Path Analysis ◽  
Wood Density ◽  
Tree Growth ◽  
Picea Mariana ◽  
Black Spruce ◽  
Planting Density ◽  
Longitudinal Shrinkage ◽  
Eastern Canada ◽  
Initial Spacing ◽  
Transverse Shrinkage

AbstractThis study has quantified basic wood density and various types of wood shrinkage in relation to initial spacing (or initial planting density) and tree growth based on a 48-year-old black spruce (Picea mariana) spacing trial in eastern Canada. A total of 139 sample trees were collected from four initial spacings (3086, 2500, 2066, 1372 trees/ha) for this study. Analyses of variance (ANOVA) show that initial spacing is the most important parameter affecting wood density significantly, followed by tree diameter at breast height (DBH) class. With increasing spacing, wood density, radial and volumetric shrinkage tend to decrease, whereas longitudinal shrinkage tends to increase gradually. The largest spacing has the lowest wood density, the smallest transverse shrinkage and the largest longitudinal shrinkage. Path analysis indicates that wood density is the most important parameter affecting transverse shrinkage, followed by the distance from the pith. Furthermore, much of the variation of the transverse shrinkage with wood density may be due to the initial spacing and tree DBH class. Path analysis also reveals that longitudinal shrinkage is mainly related to log height and tree DBH class. With increasing log height, longitudinal shrinkage tends to increase, and transverse shrinkage tends to decrease. With increasing DBH class, the trees tend to have an increasing longitudinal shrinkage and a decreasing transverse shrinkage. Overall, this study suggests that a large increase in the initial spacing (e.g., 1372 trees/ha) might lead to a significant reduction in both wood density and transverse shrinkage, and a significant increase in longitudinal shrinkage in black spruce.

scholarly journals Complete Chloroplast Genome Sequence of a Black Spruce (Picea mariana) from Eastern Canada

2020 ◽  
Vol 9 (39) ◽  
Author(s):  
Theodora Lo ◽  
Lauren Coombe ◽  
Diana Lin ◽  
René L. Warren ◽  
Heather Kirk ◽  
...  
Keyword(s):  
Chloroplast Genome ◽  
Genome Sequence ◽  
Picea Mariana ◽  
Boreal Forests ◽  
Genetic Basis ◽  
Black Spruce ◽  
Eastern Canada ◽  
Complete Chloroplast Genome ◽  
Content Type ◽  
Chloroplast Genome Sequence

ABSTRACT Here, we present the chloroplast genome sequence of black spruce (Picea mariana), a conifer widely distributed throughout North American boreal forests. This complete and annotated chloroplast sequence is 123,961 bp long and will contribute to future studies on the genetic basis of evolutionary change in spruce and adaptation in conifers.

Paludification in black spruce (Picea mariana) forests of eastern Canada: Potential factors and management implications

2005 ◽  
Vol 213 (1-3) ◽  
pp. 151-159 ◽  
Author(s):  
Nicole Fenton ◽  
Nicolas Lecomte ◽  
Sonia Légaré ◽  
Yves Bergeron
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Eastern Canada ◽  
Management Implications ◽  
Potential Factors

Chemical Differences Between the Wood Extracts of Jack Pine (Pinus Banksiana), Black Spruce (Picea Mariana) and Balsam Fir (Abies Balsamea) from Eastern Canada

1998 ◽  
Vol 18 (4) ◽  
pp. 427-438 ◽  
Author(s):  
André Pichette ◽  
Francois-Xavier Garneau ◽  
France-Ida Jean ◽  
Bernard Riedl ◽  
Michel Girard
Keyword(s):  
Picea Mariana ◽  
Pinus Banksiana ◽  
Black Spruce ◽  
Abies Balsamea ◽  
Jack Pine ◽  
Balsam Fir ◽  
Eastern Canada ◽  
Wood Extracts
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