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There is concern that genetically modified (GM) plants may have adverse affects on the arthropod biodiversity comprising agricultural landscapes. The present study report on a two year field experimental test of whether four different genotypic lines, some are novel with no previous field tests, of GM maize hybrids alter the structure of arthropod food webs that they harbour, relative to non-GM maize (control) that is widely used in agriculture. The different GM genotypes produced either Bt toxins, conferred glyphosate tolerance or a combination of the two traits. Quantitative food web analysis, based on short-term assessment assigning a total of 243,896 arthropod individuals collected from the treatments to their positions in food webs, revealed that complex and stable food webs persisted in each maize treatment. Moreover, food web structure remained relatively unchanged by the GM-genotype. The results suggest that at least in short-term period these particular GM maize genotypes will not have adverse effects on arthropod biota of agricultural landscapes.

Abstract:The dominance, diversity and activity density of rove beetles were studied in Central European apple and pear orchards. Altogether 6 877 individuals, belonging to 271 species and 11 subfamilies were collected. Thirteen species presented a relative abundance from 9 to 2% and amounted to almost 56% of all staphylinids recorded. In dominance order they were: Dinaraea angustula (Gyllenhal), Omalium caesum Gravenhorst, Drusilla canaliculata (F.), Sphenoma abdominale Mannerheim, Palporus nitidulus (F.), Xantholinus linearis (Olivier), Dexiogya corticina (Erichson), Coprochara bipustulata L., Mocyta orbata (Erichson), Oligota pumilio Kiessenwetter, Xanthlinus longiventris (Olivier), Tachyporus hypnorum (F.) and Pycnota vicina (Kraatz). The alpha diversity of staphylinids for different environmental conditions was relatively similar but the Shannon-Weiner Index (H) was higher than of other similar studies. However, the activity density was higher in pear, in sand and in abandoned plantations; under different environmental conditions this could not be considered uniform in time. After the cumulative studies on the population dynamics, one can conclude that the highest number of species can be found in spring and in summer. Species D. canaliculata and P. nitidulus presented the similar seasonal dynamics in orchards located in different environmental areas, while O. caesum had the same activity density both in apple and pear orchards.

KivonatAz észak-amerikai tölgy csipkéspoloskát (Corythucha arcuata) Európában először Észak-Olaszországban észlelték (2000). Magyarországon 2013-ban találták meg, az azóta eltelt öt évben, különösen pedig 2016-ban és 2017-ben gyors terjeszkedést mutatott. 2017 őszéig öt kivételével (Borsod-Abaúj-Zemplén, Nógrád; Győr-Moson-Sopron, Vas és Veszprém) minden magyarországi megyében előkerült. Békés, Csongrád, Jász-Nagykun-Szolnok és Baranya megyei kocsányos tölgyesek-ben már állományszintű, tömeges fellépését is észleltük, aminek összesített területe a becslések szerint legalább 5000 ha. A következő években további terjedése és tömegszaporodásai várhatóak. A kártevő tömeges fellépése július elejére/kö-zepére jelentős lombsárgulást okoz. Ennek hosszú távú hatásai a tölgyesek növedékére, egészségi állapotára, makktermésére egyelőre nem ismertek. Jelenleg megfelelő védekezési mód sem ismert.Kulcsszavak: inváziós faj, tölgy csipkéspoloska, Corythucha arcuata, terjeszkedés, Quercus. RAPID AREA EXPANSION AND MASS OCCURRENCES OF THE INVASIVE OAK LACE BUG [CORYTHUCHA ARCUATA (SAY 1932)] IN HUNGARY AbstractThe North American oak lace bug (Corythucha arcuata) was first discovered in Europe in Northern Italy (2000). In 2013, it was found in Hungary. In the last five years, particularly in 2016 and 2017, the species showed rapid area expansion. Until autumn 2017 it has been found in all Hungarian counties except five ones (Borsod-Abaúj-Zemplén, Nógrád; Győr-MosonSopron, Vas and Veszprém). Outbreaks were recorded in several pedunculate oak stands in Békés, Csongrád, Jász-Nagykun-Szolnok and Baranya counties, covering ca. 5,000 hectares of forest area in total. Further spread and outbreaks are expected in the next years. The severe infestation causes mass yellowing of the foliage by early and mid-July, long term consequences of this effect are not yet known. Neither efficient nor environmentally friendly control methods were established by now.

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