Häufigkeit und Verbreitung von Malamoeba scolyti Purrini bei Dryocoetes autographus in einigen Gebieten Nord- und Nordwestdeutschlands

1985 ◽  
Vol 104 (1) ◽  
pp. 373-380 ◽  
Author(s):  
J. -F. Kirchhoff ◽  
E. Führer
Keyword(s):  
Dryocoetes Autographus ◽  
Malamoeba Scolyti

Effects of trap height on captures of arboreal insects in pine stands of northeastern United States of America

2013 ◽  
Vol 146 (1) ◽  
pp. 80-89 ◽  
Author(s):  
Kevin J. Dodds
Keyword(s):  
United States Of America ◽  
Northeastern United States ◽  
Additional Species ◽  
Dryocoetes Autographus ◽  
Similarity Indices ◽  
Trap Height ◽  
Monochamus Scutellatus ◽  
The Common ◽  
Pine Stands ◽  
Unique Species

AbstractKnowledge of the effects of variables that can influence trapping results should help to optimise efforts in exotic species detection and other surveys. Two vertical trap placements (understorey, canopy) were tested to determine influence of these two heights on captures of Scolytinae (Coleoptera: Curculionidae), Cerambycidae (Coleoptera), and Siricidae (Hymenoptera) using semiochemical-baited multiple-funnel traps. Traps were baited with α-pinene, ethanol, ipsdienol, and ipsenol. A total of 8463 insects from 65 species and one genus were captured during the study. Average species richness, species diversity, abundance, number of unique species, and expected diversity were higher in understorey compared with canopy traps. Jaccard (0.94 ± 0.05) and Sørensen abundance (0.97 ± 0.03) similarity indices suggested highly similar communities sampled at the two trap heights. Dendroctonus valens LeConte, Dryocoetes autographus Ratzeburg, Hylastes opacus Erichson, Orthotomicus caelatus (Eichhoff), Gnathotrichus materiarius (Fitch), Asemum striatum (Linnaeus), Monochamus scutellatus scutellatus (Say), Rhagium inquisitor (Linnaeus), and Xylotrechus sagitattus sagitattus (Germar) were more abundant in understorey traps. In contrast, Ips pini (Say), Pityogenes hopkinsi Swaine, Monochamus carolinensis (Olivier), Acmaeops proteus (Kirby), and Astylopsis sexgutatta (Say) were more abundant in canopy traps. The common practice of trapping in the understorey may be optimal for sampling arboreal insects as part of survey efforts. However, additional species may be found by trapping at other vertical placements.

scholarly journals Cambioxylophagous fauna developing on logging residues of blue spruce (Picea pungens Engelmann)

2011 ◽  
Vol 57 (No. 1) ◽  
pp. 24-33 ◽  
Author(s):  
E. Kula ◽  
R. Kajfosz ◽  
J. Polívka
Keyword(s):  
Growing Season ◽  
Frequency Of Occurrence ◽  
Open Area ◽  
Spring Season ◽  
Blue Spruce ◽  
Picea Pungens ◽  
Logging Residues ◽  
Dryocoetes Autographus ◽  
Old Trees ◽  
Potential Food

Cutting down 20- to 30-years-old trees of blue spruce (Picea pungens Engelm.) (October, May) and cross-cutting them to sections of different volume (0.5–75 dm3) under conditions of half-shade × open area resulted in a potential food offer for cambiophages. Ips amitinus (Eichh.) and Pityogenes chalcographus (L.) reached the higher frequency of occurrence on sections placed in the open area than in half-shade and on stems felled in the autumn season than in the spring season. Dryocoetes autographus (Ratz.) was markedly profiled on sections in half-shade with the gradual desiccation of phloem. P. chalcographus preferring open areas occurred on branches being accompanied by Cryphalus abietis (Ratz.), which attacked branches located in half-shade. On stems of sections from both autumn and spring felling, one generation of I. amitinus developed, however, on autumn sections, the 2<sup>nd</sup> generation developed unsuccessfully on the original nutritive material. P. chalcographus completed the development of one generation on stems and branches from autumn felling. On the spring material, the invasion was delayed and a part of wintering larvae did not complete their development. Logging residues of P. pungens were available for the development of I. amitinus and P. chalcographus during one growing season only.

Occurrence of pathogens in Ips typographus (Coleoptera: Curculionidae) and in other spruce bark beetles from the wilderness reserve Dürrenstein (Lower Austria)

Biologia ◽  
2014 ◽  
Vol 69 (1) ◽  
Author(s):  
Rudolf Wegensteiner ◽  
Andrea Stradner ◽  
Uwe Händel
Keyword(s):  
Spatial Distribution ◽  
Bark Beetle ◽  
Bark Beetles ◽  
Ips Typographus ◽  
Spruce Bark ◽  
Males And Females ◽  
Time Periods ◽  
One Year ◽  
Almost All ◽  
Malamoeba Scolyti

AbstractThe study presents new data on spatial distribution of bark beetle pathogens, on changes in frequency over several years and on their prevalence during different time periods within a year from several locations within the wilderness reserve Dürrenstein (Lower Austria). The occurrence of pathogens was investigated in Ips typographus (during five years), in Pityogenes chalcographus (during two years) and in Ips amitinus (in one year). In total, seven pathogen species could be detected in I. typographus. The most dominant pathogen species were the Ips typographus-Entomopoxvirus (ItEPV), the sporozoan species Gregarina typographi and the microsporidium Chytridiopsis typographi; the latter two pathogen species were recorded every year and at about similar high (G. typographi) or low (C. typographi) rates, the ItEPV in strongly varying rates. The neogregarine Mattesia cf. schwenkei and the two microsporidia Nosema typographi and Unikaryon montanum were found in I. typographus only sporadically and the rhizopodan species Malamoeba scolyti was found once. The number of infected males and females was relatively similar with almost all pathogen species in most of the years except U. montanum, which occurred exclusively in females. Three pathogen species were recorded in P. chalcographus which were Gregarina typographi, Mattesia cf. schwenkei and Chytridiopsis typographi. Two pathogen species were observed in I. amitinus, Gregarina typographi and Chytridiopsis typographi.

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