Observations on sex ratio and behavior of males in Xyleborinus saxesenii Ratzeburg (Scolytinae, Coleoptera) by Peter Biedermann

“…Females of Xyleborinus saxesenii Ratzeburg produced between 0 and 3 sons per brood, and the absence of males was relatively independent of the number of daughters to be fertilized and the maternal brood sex ratio. …”
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Notes on the genus Dendrocerus Ratzeburg (Hymenoptera, Megaspilidae) from China, with description of two new species by Xu Wang, Huayan Chen, István Mikó, Yixin Huang, Chaodong Zhu

“…Species of the genus Dendrocerus Ratzeburg, 1852 (Hymenoptera: Megaspilidae) from China were studied. …”
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Occurrence of exotic Russian sturgeons, Acipenser gueldenstaedtii Brandt et Ratzeburg, 1833 (Actinopterygii: Acipenseridae) in the Baltic Sea by S. Keszka, T. Heese

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The relationship between morphological and sexual indices in suitable brood Russian sturgeon Acipenser gueldenstaedtii (Brandt and Ratzeburg, 1833) by Bahram Falahatkar, Javid Imanpour

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First Record Of Clytra Laeviuscula Ratzeburg As Potential Insect Pest Of Energy Willow (Salix Viminalis L.) In Ukraine by Stefanovska Tatyana, Lewis Edwin, Pidlisnyuk Valentina, Smyrnykh Oleg

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Synonymy of Idiococcobius Hayat with Coccobius Ratzeburg (Hymenoptera, Aphelinidae): evidenced by a new species from Malaysian Borneo by Hui Geng, Cheng-De Li, Jason Mottern, Andrew Polaszek

“…Idiococcobius Hayat, syn. nov., is synonymised with Coccobius Ratzeburg, based on morphological and molecular data from a new species of Coccobius from Malaysian Borneo. …”
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Thermal requirements of Aprostocetus hagenowii (Ratzeburg, 1852) (Hymenoptera, Eulophidae) reared in oothecae of Periplaneta americana Linnaeus, 1758 (Blattaria, Blattidae) by Marcial Corrêa Cárcamo, Francielly Felchicher, Jucelio Peter Duarte, Rodrigo Ferreira Krüger, Élvia Elena Silveira Vianna, Paulo Bretanha Ribeiro

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Growth Performance and Feed Utilization of Russian Sturgeon Acipenser gueldenstaedtii Brandt&Ratzeburg, 1833 in Grow-out Phase Cultured in the Black Sea by Mehmet Kocabaş, Nadir Başçınar, Şebnem Atasaral Şahin, Ramazan Serezli

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Economic efficiency of growing early juveniles of Russian sturgeon (Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833) with the introduction in the diet inactivated baker's yeast by M. Simon, Н. Kurinenko, N. Kolesnik

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Population ecology of the american cockroach, Periplaneta americana (L.) And its potential control using parasitoid Aprostocetus hagenowii (ratzeburg) (hymenoptera: eulophidae). by Tee, Hui Siang

“…Selain itu, potensi penggunaan parasitoid ooteka lipas, Aprostocetus hagenowii (Ratzeburg), dalam pengawalan lipas Amrika juga dikaji dalam aspek meningkatkan kaedah pemeliharaan dan kawalan biologi terhadap lipas. …”
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Population Ecology Of The American Cockroach, Periplaneta Americana (l.) And Its Potential Control Using P Arasitoid Aprostocetus Hagenowii (ratzeburg) (hymenoptera: Eulophidae) by Tee, Hui Siang

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Some Hematological and Non-Specific Immune Responses of Rosehip (Rosa canina) - Fed Russian Sturgeon (Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833) to Mycobacterium salmoniphilum by Selçuk Duman, Aysel Şahan

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Distribution of the invasive ambrosia beetle Xyleborinus attenuatus Blandford, 1894 (Coleoptera: Curculionidae: Scolytinae) in the Czech Republic (Central Europe) by Fiala Tomáš, Holuša Jaroslav

Subjects: “…xyleborinus saxesenii ratzeburg…”
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Morphological parameters of the digestive system of Russian sturgeon (Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833) fry under exposure to dry baker's yeasts as an additive to the basic feed by M. Simon, Yu. Zabytivskyi, I. Hrytsyniak, L. Dragan

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The Global carbon cycle/ by Bolin, Bert, Workshop on the Carbon Cycle (1977 : Ratzeburg, Ger.)

Фауна жуков-златок (Coleoptera, Buprestidae) Тюменской области by E.V. Sergeeva, V.A. Stolbov

“…Десять видов: Dicerca amphibia Marseul, 1865, Lamprodila decipiens (Gebler, 1847), Poecilonota variolosa (Paykull, 1799), Chrysobothris affinis (Fabricius, 1794), Agrilus fleischeri Obenberger, 1925, A. mendax Mannerheim, 1837, A. cyanescens (Ratzeburg, 1837), A. ribesi Schaefer, 1946, A. delphinensis Abeille de Perrin, 1897 и A. pratensis (Ratzeburg, 1837) для региона приводятся впервые.…”
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Water Balance, Host Utilisation, And Mass Rearing Improvements Of The Cockroach Oothecal Parasitoids, Aprostocetus Hagenowii (Hymenoptera: Eulophidae) And Evania Appendigaster... by Tee , Hui Siang

“…Tesis ini menumpu kepada keseimbangan air, penggunaan perumah and peningkatan kultur massa Aprostocetus hagenowii (Ratzeburg) (Hymenoptera: Eulophidae) dan Evania appedigaster (Linnaeus) (Hymenoptera: Evaniidae), dua parasitoid ooteka lipas Amerika Periplaneta americana (Linnaeus) (Blattidae: Dictyoptera). …”
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A survey of parasitoids from Greece with new associations by Nickolas G. Kavallieratos, Saša S. Stanković, Martin Schwarz, Eleftherios Alissandrakis, Christos G. Athanassiou, George D. Floros, Vladimir Žikić

“…Nine parasitoids are reported for the first time in Greece, i.e., three Ichneumonidae: Campoplex difformis (Gmelin, 1790), Gelis albipalpus (Thomson, 1884), and Lysibia tenax Townes, 1983; five Braconidae: Charmon cruentatus Haliday, 1833, Dendrosoter protuberans (Nees, 1834), Dolichogenidea longipalpis (Reinhard, 1880), Ecphylus silesiacus (Ratzeburg, 1848), and Spathius curvicaudis Ratzeburg, 1844; and one Eulophidae: Melittobia acasta (Walker, 1839). …”
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Dendrocerus lui (Hymenoptera, Ceraphronoidea, Megaspilidae): a new species of Dendrocerus carpenteri species-group from China by Fang Li, Shanshan Cui, Yixin Huang, Xuan Wang, Huayan Chen, Xu Wang

“…One new species of the genus Dendrocerus Ratzeburg, 1852, D. lui Li and Wang sp. nov. is described. …”
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Notes on braconid wasps (Hymenoptera, Braconidae) parasitising on Agrilus mali Matsumura (Coleoptera, Buprestidae) in China by Liang Ming Cao, Yan Long Zhang, Cornelis van Achterberg, Zhi Yong Wang, Xiao Yi Wang, Wen Xia Zhao, Zhong Qi Yang

“…Six species were found parasitising Agrilus mali in NW China, namely, Atanycolus ivanowi (Kokujev) (Braconinae), Doryctes undulatus (Ratzeburg), Pareucorystes varinervis Tobias, Polystenus rugosus Foerster, Spathius sinicus Chao, and Spathius brevicaudis Ratzeburg (Doryctinae). …”
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