Results 111 to 120 of about 190 (148)

Cytologie und Spermapolyploidie bei Pityogenes chalcographus L. (Col., Scolytidae)

Journal of Applied Entomology, 1986
AbstractCytology and spermpolyploidy in Pityogenes chalcographus L. (Col., Scolytidae)These experiments are based on the biological relationship that a partial reproductive incompatibility does exist between certain populations of Pityogenes chalcographus.
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Isoenzymanalyse verschiedener Populationen vonPityogenes chalcographus L.(Col., Scolytidae)

Journal of Applied Entomology, 1990
AbstractIsoenzymeanalysis of different populations in Pityogenes chalcographus L. (Col., Scolytidae) II. Population structure, differentiation of populationsSix populations of the spruce bark beetlePityogenes chalcographusfrom Scandinavia (Finland, Norway) Eastern and Central Europe (Poland, Federal Republic of Germany, Austria) were analysed for their
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Differences in bark beetle (Ips typographus and Pityogenes chalcographus) abundance in a strict spruce reserve and the surrounding spruce forests of Serbia

Phytoparasitica, 2010
Frequent windthrow in the strict reserves of spruce in the Kopaonik National Park provides much material favorable for the development of Ips typographus (L.) and Pityogenes chalcographus (L.) (Coleoptera, Scolytidae). Therefore it was assumed that the abundance of these bark beetles in the reserves was high and that they dispersed to the surrounding ...
Marković, Čedomir, Stojanović, Aleksandar   +1 more
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Production of pheromone components, chalcogran and methyl (E,Z)-2,4-decadienoate, in the spruce engraver Pityogenes chalcographus

Journal of Insect Physiology, 1990
Abstract Capillary gas chromatography and mass spectrometry were used to quantify the amounts of E- and Z- chalcogran and methyl (E,Z)-2,4-decadienoate (E,Z-MD), pheromone synergists of the bark beetle Pitygenes chalcographys (Coleoptera: Scolytidae).
Göran Birgersson, John A. Byers, Gunnar Bergström, Jan Löfqvist   +3 more
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Felling date affects the occurrence of Pityogenes chalcographus on Scots pine logging residues

Agricultural and Forest Entomology, 2012
Logging residues form a substantial portion of the dead wood in managed forests, and logging residues can facilitate bark beetle multiplication and outbreaks. For these reasons, it is highly advisable to find a way of reducing the risk of bark beetle outbreaks without extensive ...
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Особенности биологии гравера обыкновенного (Pityogenes Chalcographus L.) в Центральной части Беларуси

2022
В статье рассмотрены сроки и характер лёта Pityogenes chalcographiis L. в течение вегетационного периода в еловых насаждениях центральной части Беларуси. Приведены данные о встречаемости этого вида в пределах фенологических групп. Приведены сведения о фазах зимовки вредителя. Показана возможность реализации двух генераций Pityogenes chalcographus L.
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Rassendifferenzierung bei Pityogenes chalcographus L. (Col., Scolytidae)

Forstwissenschaftliches Centralblatt, 1980
E. Führer, E. -L. Klipstein
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Studien über intraspezifische Inkompatibilität bei Pityogenes chalcographus L. (Col., Scolytidae)¹

Zeitschrift für Angewandte Entomologie, 1977
AbstractStudies on intraspecific incompatibility in Pityogenes chalcographus L. (Col., Scolytidae)Fertility of 13 North and Central European strains of Pityogenes chalcographus was comparatively studied in the laboratory and crossing experiments between some of these strains were performed.
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Trappings of Pityogenes chalcographus L., with CME 519-74 and Chalcoprax

1989
A summary of projects conducted by the Cemagref on the Pityogenes chalcographus' pheromonal complex is presented with emphasis on the commercial mixture, chalcoprax, as mass attractant. This insect tends to destroy young spruce populations. As with the Phéroprax used for the typographus, this artificial pheromone can be used to monitor the relative ...
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Spermapolyploidie durch interpopulare Bastardierung bei Pityogenes chalcographus

Naturwissenschaften, 1980
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