Survey and mass trapping of ambrosia beetles (Coleoptera: Scolytidae) in timber processing areas on Vancouver Island

1983 ◽  
Vol 13 (3) ◽  
pp. 481-493 ◽  
Author(s):  
B. S. Lindgren ◽  
J. H. Borden
Keyword(s):  
Spatial Distribution ◽  
Inventory Management ◽  
Population Estimates ◽  
Distribution Data ◽  
Mass Trapping ◽  
Spatial Distributions ◽  
Ambrosia Beetles ◽  
Baited Traps ◽  
Temporal And Spatial ◽  
Trap Placement

The spatial distribution and population estimates of overwintering Trypodendronlineatum (Olivier) were determined by sampling beetles in the duff at four dryland log sorts. The temporal and spatial distributions of flying T. lineatum, Gnathotrichussulcatus (LeConte), and G. retusus (LeConte) over 3 years were determined by catches by pheromone-baited traps in three dryland sorts. At one dryland sort the distribution data from survey trapping and overwintering sampling were used to establish optimal trap placement for the subsequent year's trapping. At this dryland sort the trapping effort was expanded from a survey into a mass trapping program, using a barrier strategy. The total catches of all three species in 1979, 1980, and 1981 were 120 000, 690 000, and 2 800 000, respectively. Approximately 66 and 79% of the captured beetles in 1980 and 1981, respectively, were T. lineatum. When compared with high and low population estimates of overwintering T. lineatum the catches of this species represented 1–3, 12–21, and 44–77% of the total overwintering population for the respective years. For each year, the following winter's population remained constant relative to previous years. A mass trapping program, utilizing synthetic pheromones, multiple funnel traps, and sticky vane traps, was recommended in conjunction with improved log inventory management.

A SURVEY FOR THE AMBROSIA BEETLES TRYPODENDRON LINEATUM AND GNATHOTRICHUS RETUSUS (COLEOPTERA: SCOLYTIDAE) IN A SAWMILL USING PHEROMONE-BAITED TRAPS

1985 ◽  
Vol 117 (1) ◽  
pp. 49-55 ◽  
Author(s):  
T. L. Shore ◽  
J. A. McLean
Keyword(s):  
Temporal Distribution ◽  
Distribution Patterns ◽  
Mass Trapping ◽  
Spatial And Temporal Distribution ◽  
Trypodendron Lineatum ◽  
Ambrosia Beetles ◽  
Baited Traps

AbstractThe pheromones lineatum and (+)-sulcatol were used in traps in a sawmill to survey the ambrosia beetles Trypodendron lineatum (Olivier) and Gnathotrichus retusus (LeConte) respectively. Spatial and temporal distribution patterns for both species were identified. This information can be used for the establishment of a pheromone-based mass-trapping program for ambrosia beetles. The addition of ethanol and α-pinene to traps baited with (+)-sulcatol significantly increased the catches of G. retusus.

FACTORS INFLUENCING THE EFFICIENCY OF PHEROMONE-BAITED TRAPS FOR THREE SPECIES OF AMBROSIA BEETLES (COLEOPTERA: SCOLYTIDAE)

1983 ◽  
Vol 115 (3) ◽  
pp. 303-313 ◽  
Author(s):  
B. S. Lindgren ◽  
J. H. Borden ◽  
L. Chong ◽  
L. M. Friskie ◽  
D. B. Orr
Keyword(s):  
Aggregation Pheromone ◽  
Release Rate ◽  
Mass Trapping ◽  
Trypodendron Lineatum ◽  
Ambrosia Beetles ◽  
Factors Influencing ◽  
Forest Margin ◽  
Baited Traps ◽  
Funnel Trap ◽  
Better Than

AbstractThe optimal release rate of the aggregation pheromone, lineatin, for trapping Trypodendron lineatum (Olivier) was 40 μg/24h. Sticky vane traps were more efficient than three other trap types for T. lineatum and Gnathotrichus retusus (LeConte). For G. sulcatus (LeConte), a multiple funnel trap was more efficient than a sticky cylinder trap but no better than vane traps or Scandinavian drainpipe traps. Placement of bait in the middle or bottom of drainpipe traps increased their efficiency in capturing T. lineatum and G. sulcatus. Multiple funnel traps and drainpipe traps releasing lineatin at 10 μg/24h, with an additional dispenser releasing lineatin at 30 μg/24h 1.5–2 m away from the trap caught more T. lineatum than traps releasing lineatin at 10 μg/24h, and were as efficient as traps releasing the pheromone at 40 μg/24h. Thus, the beetles respond strongly to the trap silhouette once attracted to its vicinity. In late April traps placed 15–25 m inside the forest margin caught more T. lineatum than traps at the margin, probably intercepting overwintering beetles before they left the forest. A few strategically placed vane traps among numerous multiple funnel or drainpipe traps are recommended for mass trapping of ambrosia beetles in timber processing areas.

Temporal and spatial distributions of velvetleaf seedlings after 1 year's seeding

Weed Science ◽  
1998 ◽  
Vol 46 (4) ◽  
pp. 414-418 ◽  
Author(s):  
Jianhua Zhang ◽  
Allan S. Hamill
Keyword(s):  
Spatial Distribution ◽  
Environmental Conditions ◽  
Spatial Relationship ◽  
Spatial Distributions ◽  
Soybean Field ◽  
Reproductive Maturity ◽  
Previous Record ◽  
Close Spatial Relationship ◽  
Temporal And Spatial ◽  
Second Year

Two separate experiments were conducted from 1974 through 1980 and from 1976 through 1982 at an experimental farm in southwestern Ontario, Canada, to determine the pattern of temporal and spatial distributions of velvetleaf seedlings from seed produced by uncontrolled plants. For each experiment, a soybean field with no previous record of velvetleaf infestation was selected and planted with four patches of 10 velvetleaf plants. The plants were allowed to grow to reproductive maturity for 1 yr, and the density and spatial distribution of velvetleaf seedlings within the field were mapped over the next 6 yr. Although velvetleaf seedlings emerged each year after seeding, the highest percentage emerged the second year after seeding. Velvetleaf seedlings emerged at locations with or without a seeding plant, but a high density of emerged seedlings was often observed at locations some distance away from the seeding plants. The results suggest that under conventional harvesting methods there may not always be a close spatial relationship between the distribution of parent plants and their offspring, depending on the scale of the land and biotic and abiotic environmental conditions.

scholarly journals Modeling Spatiotemporal Population Changes by Integrating DMSP-OLS and NPP-VIIRS Nighttime Light Data in Chongqing, China

2021 ◽  
Vol 13 (2) ◽  
pp. 284
Author(s):  
Dan Lu ◽  
Yahui Wang ◽  
Qingyuan Yang ◽  
Kangchuan Su ◽  
Haozhe Zhang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Relative Error ◽  
Urban Areas ◽  
Large Scale ◽  
Population Distribution ◽  
Spatial Optimization ◽  
Distribution Data ◽  
Mountainous Areas ◽  
Mean Relative Error ◽  
Nighttime Light

The sustained growth of non-farm wages has led to large-scale migration of rural population to cities in China, especially in mountainous areas. It is of great significance to study the spatial and temporal pattern of population migration mentioned above for guiding population spatial optimization and the effective supply of public services in the mountainous areas. Here, we determined the spatiotemporal evolution of population in the Chongqing municipality of China from 2000–2018 by employing multi-period spatial distribution data, including nighttime light (NTL) data from the Defense Meteorological Satellite Program’s Operational Linescan System (DMSP-OLS) and the Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (NPP-VIIRS). There was a power function relationship between the two datasets at the pixel scale, with a mean relative error of NTL integration of 8.19%, 4.78% less than achieved by a previous study at the provincial scale. The spatial simulations of population distribution achieved a mean relative error of 26.98%, improved the simulation accuracy for mountainous population by nearly 20% and confirmed the feasibility of this method in Chongqing. During the study period, the spatial distribution of Chongqing’s population has increased in the west and decreased in the east, while also increased in low-altitude areas and decreased in medium-high altitude areas. Population agglomeration was common in all of districts and counties and the population density of central urban areas and its surrounding areas significantly increased, while that of non-urban areas such as northeast Chongqing significantly decreased.

scholarly journals Recent advances toward the sustainable management of invasive Xylosandrus ambrosia beetles

2021 ◽  
Author(s):  
Antonio Gugliuzzo ◽  
Peter H. W. Biedermann ◽  
Daniel Carrillo ◽  
Louela A. Castrillo ◽  
James P. Egonyu ◽  
...  
Keyword(s):  
Urban Areas ◽  
Physiological Stress ◽  
Plant Stress ◽  
Real Field ◽  
Broad Host Range ◽  
Ambrosia Beetles ◽  
Baited Traps ◽  
Rapid Spread ◽  
Mycoparasitic Fungi ◽  
History Of

AbstractWe provide an overview of both traditional and innovative control tools for management of three Xylosandrus ambrosia beetles (Coleoptera: Curculionidae: Scolytinae), invasive species with a history of damage in forests, nurseries, orchards and urban areas. Xylosandrus compactus, X. crassiusculus and X. germanus are native to Asia, and currently established in several countries around the globe. Adult females bore galleries into the plant xylem inoculating mutualistic ambrosia fungi that serve as food source for the developing progeny. Tunneling activity results in chewed wood extrusion from entry holes, sap outflow, foliage wilting followed by canopy dieback, and branch and trunk necrosis. Maintaining plant health by reducing physiological stress is the first recommendation for long-term control. Baited traps, ethanol-treated bolts, trap logs and trap trees of selected species can be used to monitor Xylosandrus species. Conventional pest control methods are mostly ineffective against Xylosandrus beetles because of the pests’ broad host range and rapid spread. Due to challenges with conventional control, more innovative control approaches are being tested, such as the optimization of the push–pull strategy based on specific attractant and repellent combinations, or the use of insecticide-treated netting. Biological control based on the release of entomopathogenic and mycoparasitic fungi, as well as the use of antagonistic bacteria, has yielded promising results. However, these technologies still require validation in real field conditions. Overall, we suggest that management efforts should primarily focus on reducing plant stress and potentially be combined with a multi-faceted approach for controlling Xylosandrus damage.

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