Field Studies on Attack Flight and Log Selection by the Ambrosia Beetle Trypodendron lineatum (Oliv.) (Coleoptera: Scolytidae)

1962 ◽  
Vol 94 (1) ◽  
pp. 74-92 ◽  
Author(s):  
J. A. Chapman
Keyword(s):  
Direct Observation ◽  
Experimental Verification ◽  
Field Studies ◽  
Ambrosia Beetle ◽  
Flight Period ◽  
Trypodendron Lineatum

Investigations in 1959 (Dyer and Kinghorn, 1961) revealed a large overwintering population of the ambrosia beetle, Trypodendron lineatum (Oliv.), in a level accessible stand of timber. It was decided to use this location for field studies on attack behaviour of this insect, with three general objectives in mind: 1) direct observation of beetles as they searched for and found suitable log material; 2) experimental verification by means of various ‘hidden log’ situations, with controls, of the importance of smell in the beetles' search, and 3) observation and measurement of differences in attractiveness between logs during the flight period.

LINEATIN ENANTIOMER PREFERENCE, FLIGHT PERIODS, AND EFFECT OF PHEROMONE CONCENTRATION AND TRAP LENGTH ON THREE SYMPATRIC SPECIES OF TRYPODENDRON (COLEOPTERA: SCOLYTIDAE)

2000 ◽  
Vol 132 (6) ◽  
pp. 877-887 ◽  
Author(s):  
B.S. Lindgren ◽  
S.E.R. Hoover ◽  
A.M. MacIsaac ◽  
C.I. Keeling ◽  
K.N. Slessor
Keyword(s):  
Sex Ratio ◽  
Reproductive Isolation ◽  
Release Rate ◽  
Sympatric Species ◽  
Ambrosia Beetle ◽  
Flight Period ◽  
Trypodendron Lineatum ◽  
Temporal Separation ◽  
Baited Traps ◽  
Pheromone Concentration

AbstractThe effects of lineatin enantiomer ratios, lineatin release rate, and trap length on catches and the flight periods of three sympatric species of Trypodendron Stephens were investigated in field bioassays using multiple-funnel traps. The ambrosia beetle, Trypodendron betulae Swaine, was caught in similar numbers in baited traps and blank control traps, showing that this species does not respond to lineatin. Our results confirmed that Trypodendron lineatum (Olivier) is attracted only to (+)-lineatin. Trypodendron rufitarsus (Kirby) and Trypodendron retusum (LeConte) were shown to utilize lineatin and like T. lineatum were caught only when (+)-lineatin was present. These results indicate that lineatin does not govern reproductive isolation among these three species. There was no effect by (+)-lineatin release rate within the range tested. The flight of T. rufitarsus commenced earlier and ceased before the peak of the T. lineatum flight, suggesting that temporal separation may be an important component of reproductive isolation between these two species. The flight period of T. retusum was similar to that of T. lineatum. Host odours may aid in reproductive isolation of these two species. Enantiomer blend did not significantly affect sex ratio in any species; however, sex ratio differed among species, indicating that different species responded differently to the traps or that natural sex ratios differ. Catches of T. rufitarsus and T. retusum increased with trap length when pheromone release per trap was held constant and when release was held constant relative to trap length. Trap length and release rate did not affect sex ratio.

Flight and Attack of the Ambrosia Beetle, Trypodendron lineatum (Oliv.) in Relation to Felling Date of Logs

1965 ◽  
Vol 97 (1) ◽  
pp. 42-57 ◽  
Author(s):  
E. D. A. Dyer ◽  
J. A. Chapman
Keyword(s):  
Douglas Fir ◽  
Ambrosia Beetle ◽  
Considerable Variability ◽  
Trypodendron Lineatum ◽  
Brood Rearing

AbstractLog preference of the ambrosia beetle, Trypodendron lineatum (Oliv.) (Coleoptera: Scolytidae), was studied by flight traps, attack density counts, and forced attacks, on 200 Douglas fir felled over a ten-month period. During heavy spring flights in late May, the beetles attacked logs from the August through January fellings, but not those cut February through May. At the end of the first brood-rearing period, parts of logs protected by plastic sheeting from earlier flights were attacked in this same pattern. Beetles confined on logs at different times attacked in essentially the same way as free beetles. It is concluded that felling date greatly influences subsequent attack. However, there was considerable variability in attack within groups of trees cut the same dates. Furthermore, attack on very short (1- and 3-foot) sections from the February fellings, when the corresponding logs were unattractive, showed that a factor other than time of felling also influenced log attractiveness. Some information was secured on flight and attack of other scolytid beetles in relation to felling date of logs.

ETHANOL AS THE PRIMARY ATTRACTANT FOR THE AMBROSIA BEETLE TRYPODENDRON LINEATUM (COLEOPTERA: SCOLYTIDAE)

1970 ◽  
Vol 102 (8) ◽  
pp. 985-995 ◽  
Author(s):  
Henry A. Moeck
Keyword(s):  
Anaerobic Treatment ◽  
Ambrosia Beetle ◽  
Repellent Effect ◽  
Trypodendron Lineatum ◽  
Low Concentration ◽  
Laboratory Bioassays

AbstractMethanol, acetaldehyde, and ethanol have been identified in extracts of attractive wood and bark. The attractancy induced by anaerobic treatment in both sapwood and phloem of conifers and broadleaf trees was characterized by ethanol as the most concentrated component. In laboratory bioassays, ethanol was attractive at low concentration to both sexes of Trypodendron lineatum (Olivier). Methanol and acetaldehyde, at the concentrations found, apparently play no role in attraction. Monoterpenes had a repellent effect on T. lineatum.

ATTRACTIVENESS OF LOGS CONTAINING FEMALE SPRUCE BEETLES, DENDROCTONUS OBESUS (COLEOPTERA: SCOLYTIDAE)

1968 ◽  
Vol 100 (7) ◽  
pp. 769-776 ◽  
Author(s):  
E. D. A. Dyer ◽  
D. W. Taylor
Keyword(s):  
Natural Populations ◽  
Field Studies ◽  
Flight Period ◽  
Low Level ◽  
Spruce Beetle

AbstractField studies were carried out on effect of attack by unmated spruce beetles, Dendroctonus obesus (Mann.) on log attractiveness. Test logs were screen-covered or sprayed with insecticide. Trays beneath logs, with glass-barrier traps beside them, were used to measure response of beetles from natural populations.About 89% of the beetles attracted at six replicate sites were taken at logs containing introduced females. Males always predominated in responses to these logs. After the initial flight, about equal numbers of each sex responded to logs without introduced females. Response to the latter dropped to a low level after the initial flight, but beetles continued to respond well to logs attacked by females throughout the flight period. Use of increased attractiveness to logs following introduction of female beetles shows promise as a means of studying, directing, or controlling infestations of the spruce beetle.

The aligning effect of light flicker on phototaxis of the ambrosia beetle Trypodendron lineatum (Olivier)

1968 ◽  
Vol 46 (3) ◽  
pp. 602-603 ◽  
Author(s):  
K. Graham ◽  
Isabelle A. Moeck
Keyword(s):  
Light Intensity ◽  
Ambrosia Beetle ◽  
Trypodendron Lineatum ◽  
Chemical Attractants ◽  
Light Flicker ◽  
Effect Of Light

A light which was flickered at approximately 5 cycles per second provoked a more direct guided response in the ambrosia beetle Trypodendron lineatum (Olivier) than did a steady source of the same intensity. Among the principal implications are those which concern the use of the beetles in bioassay of chemical attractants in which light is used as an opposing stimulus. The light intensity should be at least stabilized, and preferably flickered at an appropriate frequency.

scholarly journals KONTRIBUSI PENYULUH AGAMA ISLAM SEBAGAI PENDIDIK NONFORMAL DALAM MENAMBAH WAWASAN KEBERAGAMAAN PADA MASYARAKAT KEC. TANETE RIATTANG BARAT KAB. BONE

2020 ◽  
Vol 16 (2) ◽  
pp. 196-205
Author(s):  
Sri Anugrah Indriani
Keyword(s):  
Religious Education ◽  
Direct Observation ◽  
Formal Education ◽  
Religious Diversity ◽  
Field Studies ◽  
Islamic Education ◽  
Community Environment ◽  
Interview Techniques ◽  
Community People ◽  
Insight Into

AbstractIslamic religious education is not only obtained at the level of formal education. Education in the community environment also contributes to the development of religious diversity in society. The presence of Islamic religious instructors as non-formal educators is the answer to the needs of educators for the community. People who come from various backgrounds have their own place to study Islamic education. This research uses field studies that directly involve the community, conduct interview techniques, collect data and direct observation in the field. The results of this study explain that the insights of religious diversity so far have been good. The use of various methods greatly influences the insights received by the community. Therefore, Islamic extension workers as non-formal educators also need to prepare themselves to face the challenges that exist in the community environment. Keywords: islamic religious instructor, insight into the diversity of society. 

AN EVALUATION OF THREE TRAPS AND TWO LURES FOR THE AMBROSIA BEETLE TRYPODENDRON LINEATUM (OLIV.) (COLEOPTERA: SCOLYTIDAE) IN CANADA, NORWAY, AND WEST GERMANY

1987 ◽  
Vol 119 (3) ◽  
pp. 273-280 ◽  
Author(s):  
J.A. McLean ◽  
A. Bakke ◽  
H. Niemeyer
Keyword(s):  
British Columbia ◽  
West Germany ◽  
Ambrosia Beetle ◽  
Trypodendron Lineatum ◽  
Baited Traps

AbstractMultiple funnel, Schlitzfalle, and drainpipe traps baited with Linoprax® or Biolure® semiochemical baiting systems for the ambrosia beetle Trypodendron lineatum (Oliv.) were evaluated in similar experiments in British Columbia, West Germany, and Norway. In British Columbia, the Biolure-baited traps caught more T. lineatum of both sexes than did Linoprax-baited traps. The Linoprax-baited traps caught more male T. lineatum in West Germany and Norway but fewer females than the Biolure system. Low percentages of female T. lineatum were often recorded at drainpipe traps.

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