INFLUENCE OF HOST FOLIAGE ON DEVELOPMENT, SURVIVAL, FECUNDITY, AND OVIPOSITION OF THE SPEAR-MARKED BLACK MOTH, RHEUMAPTERA HASTATA (LEPIDOPTERA: GEOMETRIDAE)

1979 ◽  
Vol 111 (3) ◽  
pp. 317-322 ◽  
Author(s):  
Richard A. Werner
Keyword(s):  
Host Plants ◽  
Development Rate ◽  
Larval Feeding ◽  
Betula Papyrifera ◽  
Egg Viability ◽  
Feeding Intensity ◽  
Interior Alaska ◽  
Birch Trees ◽  
Paper Birch

AbstractSpear-marked black moth, Rheumaptera hastata (L.), females tended to oviposit more readily on paper birch, Betula papyrifera Marsh., than other deciduous plants indigenous to interior Alaska. Larval feeding intensity was about 40% higher on birch foliage than on other host plants. Larvae reared on various host plant species differed in survival, development rate, and body weight. Food quality of host plants on which females were reared as larvae affected oviposition, fecundity, and egg viability. Larval development rate and survival decreased when fed foliage from birch trees that were repeatedly defoliated for 2 and 3 years.

Occurrence, proportion, and vertical distribution of red heartwood in paper birch

2008 ◽  
Vol 38 (7) ◽  
pp. 1996-2002 ◽  
Author(s):  
Guillaume Giroud ◽  
Alain Cloutier ◽  
Jérôme Alteyrac
Keyword(s):  
Vertical Distribution ◽  
Tree Height ◽  
Tree Age ◽  
Quebec City ◽  
Betula Papyrifera ◽  
Breast Height ◽  
Birch Trees ◽  
Paper Birch ◽  
Thick Disks ◽  
Old Trees

Normal paper birch ( Betula papyrifera Marsh.) wood has a clear and uniform color. However, some paper birch trees contain reddish-brown-, discolored wood known as red heartwood. Its occurrence, proportion, and vertical distribution were investigated. One hundred and fifty trees were randomly sampled from three stands located at the Montmorency Forest, 75 km north of Quebec City, Quebec, Canada. A subsample of 18 trees showing occurrence of red heartwood at stump height were felled, and 5 cm thick disks were cut at every 0.5 m of height. Red heartwood volume, proportion, and vertical distribution were determined from the disks. Trees with larger diameter at breast height and lower tree height had a higher probability of red heartwood occurrence. Red heartwood starts occurring in 40-year-old trees on average in the stands studied. The volume of red heartwood was positively correlated with tree age, and the proportion of red heartwood was positively related to tree age, and negatively related to the amount of sunlight on the live crown. Red heartwood proportion was 13.3% of the tree merchantable volume, mostly located under the live crown.

Detection of red heartwood in paper birch (Betula papyrifera) using external stem characteristics

2011 ◽  
Vol 41 (7) ◽  
pp. 1491-1499 ◽  
Author(s):  
Benoît Belleville ◽  
Alain Cloutier ◽  
Alexis Achim
Keyword(s):  
Three Dimensional ◽  
Longitudinal Axis ◽  
Betula Papyrifera ◽  
Breast Height ◽  
Birch Trees ◽  
Value Loss ◽  
Standing Trees ◽  
Paper Birch ◽  
Scar Width ◽  
Tree Vigour

Red heartwood, a dark nonhomogenous discolouration in paper birch trees ( Betula papyrifera Marsh.), limits the applications and uses of sawn boards to nonvisible low-value products, thus resulting in substantial value loss. The occurrence and distribution of red heartwood were investigated in 12 paper birch trees grown in the province of Quebec, Canada. The youngest tree was 62 years old at breast height and the oldest 86 years old for an average of 75 years old. In this study, 225 occurrences of external traits, relating to branch scars and forks, previously proposed as initiation points for red heartwood were identified and measured. The distribution of red heartwood was digitally mapped and the effect of these external traits on the red heartwood surface and shape inside each tree was examined. Results show that red heartwood initiates from an external trait and that multiple external traits can contribute to the development of a red heartwood column following the longitudinal axis of the stem. Red heartwood appeared to initiate mainly from external traits at the base of the tree. A modelling exercise indicated that the width of the red heartwood column inside a standing tree can be estimated from branch scar width and height from the ground. Tree vigour could not be linked to the proportion of red heartwood inside standing trees. A three-dimensional analysis of log shape could potentially be used to detect red heartwood presence in a log before processing to optimize the log sawing pattern.

Occurrence and nutritive quality of lowbush cranberry on the Kenai Peninsula, Alaska

1976 ◽  
Vol 54 (9) ◽  
pp. 966-970 ◽  
Author(s):  
John L. Oldemeyer ◽  
Robert K. Seemel
Keyword(s):  
Cell Walls ◽  
Strongly Correlated ◽  
Betula Papyrifera ◽  
Acid Detergent Fiber ◽  
Kenai Peninsula ◽  
Canopy Coverage ◽  
Nutritive Quality ◽  
Paper Birch

The quantity and quality of lowbush cranberry (Vaccinium vitis-idaea L.) were studied on the Kenai National Moose Range, Alaska. Its frequency of occurrence and canopy coverage were highest in mature hardwood stands, intermediate in postburn regrowth stands of paper birch (Betula papyrifera) and spruce (Picea mariana and P. glauca), and lowest in mature spruce–hardwood stands. Its biomass, which was strongly correlated with canopy coverage (r = 0.976), was estimated as 1000–3000 kg per hectare in this area. In vitro dry matter disappearance (with moose rumen inocula) ranged from 41.2% in winter to 50.8% in summer, but the protein content (5.4–5.7%) did not change throughout the year. In winter, cell walls, acid-detergent fiber, and lignin increased slightly, while the concentration of eight detectable minerals decreased sharply.

The effect of refuge trees on a paper birch ectomycorrhiza community

2000 ◽  
Vol 77 (10) ◽  
pp. 1523-1528 ◽  
Author(s):  
J M Kranabetter
Keyword(s):  
Late Stage ◽  
Forest Succession ◽  
Early Stage ◽  
Betula Papyrifera ◽  
Forest Disturbances ◽  
Community Similarity ◽  
Rooting Zone ◽  
Multi Stage ◽  
Birch Trees ◽  
Paper Birch

Live trees within forest disturbances could support refugia populations of ectomycorrhizae fungi from which to reestablish ectomycorrhiza communities during forest succession. The effectiveness of refuge paper birch trees (Betula papyrifera Marsh.) in maintaining a forest ectomycorrhiza community on birch seedlings, both in clearcuts and forests, in northwest British Columbia was examined. Seedlings next to refuge birch trees in clearcuts had equal levels of average morphotype richness and eveness as seedlings next to mature birch trees in forests. Seedlings outside of the rooting zone of refuge trees had significantly less average morphotype richness in both clearcuts and forests, decreasing by 38 and 15%, respectively. The ectomycorrhiza communities were also more unique (lower community similarity) next to refuge trees than for seedlings away from refuge trees, especially in clearcuts. These treatment effects could be explained by differences in the ability to disperse and establish between early-stage, multi-stage, and late-stage ectomycorrhiza fungi. The results suggest refuge trees would be effective in forest management as sources of inocula for multi-stage and late-stage fungi.

Comparative drought sensitivity of co‐occurring white spruce and paper birch in interior Alaska

2021 ◽  
Author(s):  
Patrick F. Sullivan ◽  
Annalis H. Brownlee ◽  
Sarah B.Z. Ellison ◽  
Sean M.P. Cahoon
Keyword(s):  
White Spruce ◽  
Drought Sensitivity ◽  
Interior Alaska ◽  
Paper Birch

Ecological correlates of folivore abundance in north Queensland rainforests

2001 ◽  
Vol 28 (1) ◽  
pp. 1 ◽  
Author(s):  
John Kanowski ◽  
M. S. Hopkins ◽  
Helene Marsh ◽  
J. W. Winter
Keyword(s):  
Nutritional Quality ◽  
Host Plants ◽  
Inverse Relationship ◽  
Ecological Factors ◽  
Habitat Destruction ◽  
Metamorphic Rocks ◽  
Northern Australia ◽  
Altitudinal Variation ◽  
Foliage Quality

The ecological factors controlling the distribution and abundance of the folivorous marsupials endemic to the rainforests of northern Australia are not understood. In this study, we surveyed folivore abundance at 40 sites stratified by altitude and geology in rainforests of the Atherton Tableland, north Queensland. All five species of folivore that inhabit the study area were more abundant in highland (800–1200 m) than in upland (400–800 m) forests. Allowing for the effects of altitude, four species of folivore were more abundant in forests on nutrient-rich basalts than in forests on nutrient-poor acid igneous or metamorphic rocks. The abundance of two folivore species also varied inversely with rainfall. Altitudinal variation in folivore abundance in the study area has been attributed to habitat destruction, Aboriginal hunting, the distribution of host plants and climate; however, none of these hypotheses has been tested. Variation in folivore abundance with geology is plausibly explained as a response to the nutritional quality of foliage. Foliage quality may also explain the inverse relationship between two of the folivores and rainfall. The results of this study show that only a relatively small proportion of north Queensland rainforests support abundant populations of the endemic folivorous marsupials.

scholarly journals Understanding the Plant Aphid Interaction: A Review

2021 ◽  
Vol 2 (6) ◽  
pp. 1-6
Author(s):  
Waghmare Kranti ◽  
Ghayal Nivedita ◽  
Mahesh Shindikar
Keyword(s):  
Host Plants ◽  
Indirect Defense ◽  
Genetically Engineered ◽  
Aphid Infestation ◽  
Aphid Control ◽  
Aphid Feeding ◽  
Strategic Ability ◽  
Genetically Engineered Crops ◽  
Plant Sap

The interaction between plant-aphid is phenomenal and complex. Aphids possess efficient mouthparts which feed on plant sap intensively. Adaptation to host plants and successful feeding is achieved through the strategic ability of aphids to reproduce sexually and asexually (parthenogenesis). Aphid infestation damages the plant in diverse ways and induces plant defense. Though plant elicit direct and indirect defense to resist aphid feeding, the effectiveness of plant resistance depends largely on the aphid infestation rate and quality of the host plant. To control aphid infestation and plant damage, dependency on insecticides is undesirable due to insecticidal resistance of aphids and environmental pollution. The approach towards the development of the genetically engineered crops which are aphid resistant can be the considerable potential to aphid control..

Semiochemical-mediated aggregation of the ambrosia beetle Trypodendron betulae (Coleoptera: Curculionidae: Scolytinae)

2020 ◽  
Vol 153 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Susanne Kühnholz ◽  
Regine Gries ◽  
John H. Borden
Keyword(s):  
Aggregation Pheromone ◽  
Field Trapping ◽  
Betula Papyrifera ◽  
Detection Analysis ◽  
Enantiomeric Ratio ◽  
Linalool Oxide ◽  
Electroantennographic Detection ◽  
Paper Birch ◽  
Trap Catches ◽  
Chromatographic Mass

AbstractPorapak Q-captured volatiles from both sexes of Trypodendron betulae Swaine (Coleoptera: Curculionidae: Scolytinae) excised from newly attacked logs of paper birch, Betula papyrifera Marshall (Betulaceae), as well as volatiles from unattacked birch logs, were analysed by coupled gas chromatographic electroantennographic detection analysis. Active compounds were identified by gas chromatographic mass spectroscopy. The enantiomeric ratio of 6-ethenyl-2,2,6-trimethyloxan-3-ol (linalool oxide pyranoid) was determined using a Cyclodex B column. Field-trapping experiments disclosed that the female-produced aggregation pheromone of T. betulae is a blend of the (3S,6R)-trans- and (3R,6R)-cis-linalool oxide pyranoid. Trap catches were synergistically increased when the pheromone was combined with both the host volatile ethanol and with conophthorin, which was found in female beetles as well as host volatiles. Use of linalool oxide pyranoid reproductively isolates T. betulae from sympatric Trypodendron Stephens species for which only (+)-lineatin has been identified as an aggregation pheromone.

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